These include damage to epithelial tissue, such as skin and mucosa (oral, pharyngeal and bowel mucosa), as mentioned previously. Also, edema can be another side effect of radiotherapy as part of the general inflammation that occurs. Swelling of soft tissue may cause problems during radiotherapy. This is a concern during treatment of brain tumors, especially where there is preexisting raised intracranial pressure. Further more, the gonads are very sensitive to radiation, and they may be unable to produce gametes after direct exposure i.e. rendered infertile. While most of the Sun's output consists of light (solar radiation), particle radiation is also produced and varies with the solar cycle. These particles are mostly protons with relatively low energies (10-100 keV). Their average composition is similar to that of the Sun itself. This represents significantly lower energy particles than come from cosmic rays. Solar particles vary widely in their intensity and spectrum, increasing in strength after some solar events such as solar flares. Further, an increase in the intensity of solar cosmic rays is often followed by a decrease in the galactic cosmic rays, called a Forbush decrease after their discoverer, the physicist Scott Forbush. These decreases are due to the solar wind which carries the Sun's magnetic field out further to shield the earth more thoroughly from cosmic radiation. Gamma particles have no mass and no electric charge. We call them photons. They are the same particles as those that represent visible light but have much higher energy. Since they have no mass and no electric charge, it is difficult to stop them. In fact, we never can stop all of them. And we cannot define the range of gamma radiation as we were able for alpha or beta radiation. However, with distance and appropriate shielding, we can reduce gamma radiation. Since gamma radiation is very penetrating, we have to apply protection principles to minimise radiation damage to workers or to the general public. Ionizing and non-ionizing radiation have different types of radiation under them. Types Of Radiation? As we know, radiation is energy which is emitted by a source, then travels through a.. Ionizing versus Non-Ionizing Radiation. Figure 1. Ionizing radiation is radiation that can strip electrons from atoms. This process is shown above.
This is energy absorbed per unit mass and its unit is the joule per kilogram, which is given a specname Gray. We are exposed to ionizing radiation every day. Ionizing radiation is produced by unstable atoms (radioactive atoms) or by certain types of equipment (x-ray machines and CT scanners) Specific forms of ionizing radiation: Particulate radiation, consisting of atomic or It is indirectly ionizing because it does not carry an electrical charge. Ionization is caused by charged particles.. The units used to measure ionizing radiation are rather complex. The ionizing effects of radiation are measured by units of exposure:
Why Is Ionizing Radiation More Dangerous than Non-Ionizing Radiation? Ionizing radiation is like an atomic-scale cannonball that blasts through material, leaving significant damage behind An ionization event normally produces a positive atomic ion and an electron. High-energy beta particles may produce bremsstrahlung when passing through matter, or secondary electrons (δ-electrons); both can ionize in turn.
To minimise their doses, workers must wear protective clothing. In diagnostic medicine, the most common types of protective clothing are lead aprons and spectacles made of lead glass. Workers working with radioactive liquids, powders and gases must prevent contamination of their skin or inhalation and ingestion of radioactive material. The protective clothing for these workers includes cotton or plastic overalls, latex gloves, shoe covers and gas masks. The Essay on Cell Phone Radiation Phones Brain Ionizing. Excessive use of mobile phones has been accused of causing dizziness, and radiations emitted from the phone are harmful for the..
chemical and ionising radiation. high temperature exceeding 100°C or higher, conditions in which infrared radiation, flames or exposure to large splashes of molten metal may occur The principle of optimisation must be included in the document. It must be clear how the dose records will be maintained as well as the results of area monitoring. The dose constraints must be stated in a clear and understandable manner, so worker doses and the dose constraints can easily be compared. In case the dose exceeds the dose constraint, it must be known what the further steps are such as temporarily stopping the practice and investigation of why it happened.
non-ionising radiation: essentially the low-energy parts of the electromagnetic spectrum. Non-ionising radiation is mostly damaging in obvious ways. Exposure to microwaves or infrared.. Some of the radionuclides of concern include cobalt-60, caesium-137, americium-241, and iodine-131. Examples of industries where occupational exposure is a concern include: Ionizing Radiation is radiation that removes electrons from the atoms it meets, causing National Council on Radiation Protection and Measurements, Report No. 93, Ionizing Radiation Exposure of.. Radiation readings near the wildfires, where smoke is swirling about, have been elevated, with the wind blowing toward rural areas of Russia and Belarus for most of the past week. The wind shifted Friday.. Ionizing radiation (ionising radiation) is radiation that carries sufficient energy to detach electrons from atoms or molecules, thereby ionizing them. Ionizing radiation is made up of energetic..
Ionizing radiation is a term used for radiation whose quanta have energy to directly or indirectly ionize (one or more electrons are released from the atom of the given substance) molecules or atoms while passing through matter, hence the name ionizing radiation. In a nuclear war, an effective fallout shelter reduces human exposure at least 1,000 times. Most people can accept doses as high as 1 Gy[How to reference and link to summary or text], distributed over several months, although with increased risk of cancer later in life. Other civil defense measures can help reduce exposure of populations by reducing ingestion of isotopes and occupational exposure during war time. One of these available measures could be the use of potassium iodide (KI) tablets which effectively block the uptake of dangerous radioactive iodine into the human thyroid gland.
ionizing radiation (countable and uncountable, plural ionizing radiations). High-energy radiation that is capable of causing ionization in substances through which it passes; also includes high-energy particles. non-ionizing radiation. far ultraviolet light Annex E - Effects of ionizing radiation on non-human biota. Annex G - Early effects in man of high doses of radiation and Appendix: Acute radiation effects in victims of the Chernobyl nuclear power..
The units used to measure ionizing radiation are rather complex. The ionizing effects of radiation are measured by units of exposure: In some industries, accumulation of naturally occurring radioactivity can occur. Everything around us is radioactive. In some cases, this natural radioactivity can accumulate. It accumulates in the Oil and Gas industries. We drill into solids to extract oil. Solids may contain naturally occurring radioactive material that can accumulate in vessels or deposit on internal surfaces. Workers working in the vicinity of such places are exposed to elevated levels of ionising radiation. In the zircon sand industry, workers might be exposed to naturally occurring radiation since elevated levels of uranium and thorium can be found in zircon.
For the purposes of monitoring and surveillance, a distinction shall be made between two categories of exposed workers: Radiation occurs naturally and comes from sources all around us, including our own bodies. Radiation is often misunderstood, but it helps to both combat climate change and cure disease
Ionizing radiation has many uses, such as to kill cancerous cells. However, although ionizing radiation has many applications, overuse can be hazardous to human health. For example, at one time, assistants in shoe shops used X-rays to check a child's shoe size, but this practice was halted when it was discovered that ionizing radiation was dangerous. The International Commission on Non-Ionizing Radiation Protection (ICNIRP) is a body of independent scientific experts that considers how exposure to electromagnetic fields used by cell phones and other.. Ionizing Radiation. 525 likes · 1 talking about this. Ionizing radiation consists of highly-energetic particles or waves that can detach (ionize) at.. Ionising radiation is also used for treatment in oncology. Cancerous growths can be killed if large doses of ionising radiation are delivered to it. Of course, every treatment with ionising radiation sources must be well planned since radiation can also kill healthy cells.
Radiation in space takes the form of subatomic particles from the sun as well as from sources in the Radiation exposure can be acute (a high dose in a short period of time) or chronic (low levels of.. Aires offers EMF radiation protection devices that include radiation blocking products for cell phone The Guardian can be used to protect frequently used areas against electromagnetic radiation pollution In biology, radiation is mainly used for sterilization, and enhancing mutations. For example, mutations may be induced by radiation to produce new or improved species. A very promising field is the sterile insect technique, where male insects are sterilized and liberated in the chosen field, so that they have no descendants, and the population is reduced. UNSCEAR - United Nations Scientific Committee on the Effects of Atomic Radiation (2013), 50+ years of service. Retrieved on 25 February 2013 from:  All organs and tissues are not equally sensitive to ionising radiation. Some tissues are more sensitive than others. Also, during the working process, only specific organs or tissues can be exposed to radiation and not the whole body. Due to these facts, the doses to the skin and eye lens are different. The annual skin dose is limited to 500 mSv and to the eye lens to 20 mSv.
I waive all copyright to this chart and place it in the public domain, so you are free to reuse it anywhere with no permission necessary. (However, keep in mind that I am not a radiation expert, and this chart.. Occupationally exposed individuals are exposed according to the sources with which they work. The radiation exposure of these individuals is carefully monitored with the use of pocket-pen-sized instruments called dosimeters. Presumptive diseases related to ionizing radiation. VA also will consider the possibility that other diseases not listed above were caused by radiation, if supported by medical or scientific evidence
Personal protection such as gloves is intended for protection against external radiation. That means that the ionising radiation source is outside the human body and radiation is coming from that source to the body. In case of internal irradiation, the person has an ionising radiation source in the body. When such a source is in the body, no protective clothing will help. So it is very important that we prevent ingestion or inhalation of radioactive material. This is especially important at workplaces were workers work with radioactive material in liquid, powder or gaseous form. In such workplaces, there is a possibility of skin contamination of workers or even of inhalation or ingestion of radioactive material. Suitable Personal protective clothing in these cases includes latex gloves, coveralls, gas masks, shoes covers, etc. When working in very contaminated areas, workers must wear even special overpressure suits. In the case of deterministic effects, health protection can be fully ensured by non-exceeding the maximum permissible equivalent dose (limit) at a level sufficiently lower than the threshold. The average exposure for Americans is about 360 mrem (3.6 mSv) per year, 81 percent of which comes from natural sources of radiation. The remaining 19 percent results from exposure to human-made radiation sources such as medical X-rays, most of which is deposited in people who have CAT scans. This compares with the average dose received by people in the UK of about 2.2 mSv. As already mentioned, an important source of natural radiation is radon gas, which seeps continuously from bedrock but can, because of its high density, accumulate in poorly ventilated houses. . It is indirectly ionizing because it does not carry an electrical charge. Ionization is caused by charged particles, which are produced during collisions with atomic nuclei. Ionizing radiation is radiation composed of particles that carry enough energy to liberate electrons Ionizing radiation is generated through nuclear reactions, by very high temperature (e.g. the corona..
Therefore, the idea of radiation hormesis is considered unproven by regulatory bodies, which generally use the standard "linear, no threshold" (LNT) model, which states that risk of cancer is directly proportional to the dose level of ionizing radiation. The LNT model is safer for regulatory purposes because it assumes worst-case damage due to ionizing radiation; therefore, if regulations are based on it, workers might be over-protected, but they will never be under-protected. A nuclear density gauge is a tool used in civil construction and the petroleum industry as well as for mining and archaeology purposes. It consists of a radiation source that emits a directed beam of particles and a sensor that counts the received particles that are either reflected by the test material or pass through it. By calculating the percentage of particles that return to the sensor, the gauge can be calibrated to measure the density and inner structure of the test material. Deterministic effects only occur once a threshold of exposure has been exceeded. The severity of deterministic effects increases as the dose of exposure increases. Because of an identifiable threshold level, appropriate radiation protection mechanisms and occupational exposure dose limits can be put in place to reduce the likelihood of these effects occurring. Deterministic effects are caused by significant cell damage or death. The physical effects will occur when the cell death burden is large enough to cause obvious functional impairment of a tissue or organ. Such effects are skin erythema, necrosis or epilation. The deterministic effect includes eye cataracts or sterility. At doses above 1000 mSv, radiation sickness can occur. Signs of radiation sickness are nausea and vomiting, headaches, fatigue, fever and short periods of skin reddening. These symptoms are common to many illnesses and are often not recognised as the consequence of high radiation exposure. At doses above 6000 mSv, death occurs. Teratogenic mutations result from the exposure of foetuses (unborn children) to radiation. They can include smaller head or brain size, poorly formed eyes, abnormally slow growth and mental retardation. Studies indicate that foetuses are most sensitive between about eight to fifteen weeks after conception. They remain somewhat less sensitive between six and twenty-five weeks old.
I've been looking on Wikipedia about Ionizing Radiation. Basically, it's a technique that is used in Radiation Therapy... according to my research.. Ionizing radiation is a term used for radiation whose quanta have energy to directly or indirectly ionize (one or more electrons are released from the atom of the given substance) molecules or atoms while passing through matter, hence the name ionizing radiation
The term radiation means to give off energy as waves or particles. Ionizing radiation gives off energy by knocking electrons off atoms, which causes the atoms to have a charge. Another term for a charged particle is an ion. The charges on the atomic particles make ionizing radiation unstable and reactive. The particles radiate because they are trying to stabilize themselves. Ionizing radiation is a high-energy type of radiation because it comes from the high-energy end of the electromagnetic spectrum. The creation of ionizing radiation is a natural process in the universe.The biological effects of radiation are thought of in terms of their effects on living cells. For low levels of radiation, the biological effects are so small they may not be detected in epidemiological studies. The body repairs many types of radiation and chemical damage. Biological effects of radiation on living cells may result in a variety of outcomes, including: The direct effects of IR result from the ability of IR to cause DNA breaking through direct ionization of genetic material. On the other hand, the indirect effects result from the ability of IR to ionize water into free radicals ultimately leading to a chain of events that are deleterious to the cells.
Radiation effects can be categorised by when they appear as either prompt effects or delayed effects. Prompt effects are those seen immediately after large doses of radiation delivered over a short period of time. Such effects are radiation sickness or skin erythema. Delayed effects appear months or years after the exposure. Such effects are eye cataracts or cancer. Ionizing radiation is the energy or particles (protons, electrons or neutrons) produced by unstable atoms of radioactive materials. It is present in the environment, as a result of both naturally occurring radioactive minerals and cosmic radiation arriving from outer space The linear dose-response model suggests that any increase in dose, no matter how small, results in an incremental increase in risk. The linear no-threshold model (LNT) hypothesis is accepted by the Nuclear Regulatory Commission (NRC) and the EPA and its validity has been reaffirmed by a National Academy of Sciences Committee. (See the BEIR VII report, summarized in .) Under this model, about 1% of a population would develop cancer in their lifetime as a result of ionizing radiation from background levels of natural and man-made sources.
..non-ionizing form of electromagnetic radiation to things like cancer, DNA damage (especially in 5G's Non- Ionizing Radiation. When you read articles on the internet about 5G health risks it really.. Approximately 134 plant workers and fire fighters engaged at the Chernobyl power plant received high radiation doses (70,000 to 1,340,000 mrem or 700 to 13,400 mSv) and suffered from acute radiation sickness. Of these, 28 died from their radiation injuries.
Ionizing radiation ( ionising radiation) is radiation, traveling as a particle or electromagnetic wave, that carries sufficient energy to detach from or , thereby ionization them . Ionizing radiation is dangerous in direct exposure, although the degree of danger is a subject of debate. Humans and animals can also be exposed to ionizing radiation internally: if radioactive isotopes are present in the environment, they may be taken into the body. For example, radioactive iodine is treated as normal iodine by the body and used by the thyroid; its accumulation there often leads to thyroid cancer. Some radioactive elements also bioaccumulate.
The third type of ionizing radiation includes gamma and X rays, which are electromagnetic, indirectly ionizing radiation. These are indirectly ionizing because they are electrically neutral (as are all electromagnetic radiations) and do not interact with atomic electrons through coulombic forces.Cancer: There is a long latency period. For leukemia the peak of incidence is between 5-15years, for lung cancer in uranium miners between 15-25years. It is assumed that a malignancy might appear as late as 40years after exposure. The negatively-charged electrons and positively charged ions created by ionizing radiation may cause damage in living tissue. If the dose is sufficient, the effect may be seen almost immediately, in the form of radiation poisoning. Lower doses may cause cancer or other long-term problems. The effect of the very low doses encountered in normal circumstances (from both natural and artificial sources, like cosmic rays, medical X-rays and nuclear power plants) is a subject of current debate. A 2005 report released by the National Research Council (the BEIR VII report, summarized in ) indicated that the overall cancer risk associated with background sources of radiation was relatively low.
Determining the amount of a radioactive substance. The mean number of radioactive decays per unit time determined it. Its dimension is s-1. This unit has a special denotation Becquerel. To keep radiation doses low, three methods are used: time, distance and shielding. The dose is proportional to the time of exposure. This means that if someone is exposed for two hours, the dose would be two times the dose compared to if the exposure was one hour. The radiation reduces with the distance from the source. If the distance is increased from 1 m to 2 m, the dose will be reduced by a factor of 4. If the distance is increased from 1 m to 3 m, the dose will be reduced by a factor of 9. We say that radiation is reduced by the square law by distance. Whenever necessary, we can reduce doses through the use of shields. Different shielding material is used depending on the nature of the ionising radiation. The most common material is lead due to its high density and convenient price. Electrons, x rays, gamma rays or atomic ions may be used in radiation therapy to treat malignant tumors (cancer). Furthermore, just like in industrial application, x rays can also be used in radiography to create images of hard-to-image objects, such as inside one's body. Radiation: Radiation is the transfer of energy by electromagnetic radiation. Radiation does not require a medium in which the energy needs to transmit through. Solar radiation warming the Earth's.. In all exposure situations, radiation protection shall be optimised with the aim of keeping the magnitude and likelihood of exposure and the number of individuals exposed as low as reasonably achievable, taking into account economic and societal factors.
Ionizing radiation is ubiquitous and all living things are, and always have been The risk evaluation of ionizing radiation needs to be proceeded by an understanding of the radioactivity phenomenon . They behave the same as gamma rays, except that their energy is lower. Neutrons are neutral particles with mass. Since they have no electrical charge, it is difficult to stop them. They can be stopped only by a collision with other particles in the matter. For comparison, the average 'background' dose of natural radiation received by a person is around 3.6 mSv (360 mrem) per year. The lethal full-body dose of radiation for a human is around 4 - 5 Sv (400 - 500 rem) In the nuclear industry, ionising radiation is not used but is a product of the nuclear reaction. For electricity production, we use heat generated during the reaction. The radioactive atoms that also originate from a nuclear reaction emit ionising radiation. Since these radioactive atoms and ionising radiation is the by product and cannot be used in the process, it becomes radioactive waste. The cellular basis of the effects of acute radiation in man is cell killing as applied to successive populations of the cell renewal system. The main feature of the cell renewal system can be best explained using the heamatopoietic system as an example.
Ionizing radiation consists of particles or electromagnetic waves energetic enough to detach electrons from atoms or molecules, thus ionizing them. The degree and nature of such ionization depends on the energy of the individual particles or waves, and not on their number. An intense flood of particles or waves will not cause ionization if these particles or waves do not carry enough energy to be ionizing. Roughly speaking, particles or photons with energies above a few electron volts (eV) are ionizing. Ionization produces free radicals, which are atoms or molecules containing unpaired electrons, that tend to be especially chemically reactive due to their electronic structure. Fig 1. -- Alpha (α) radiation consists of a fast moving helium-4 (4He) nucleus and is stopped by a sheet of paper. Beta (β) radiation, consisting of electrons, is halted by an aluminum plate. Gamma (γ) radiation, consisting of energetic photons, is eventually absorbed as it penetrates a dense material such as brick walls. Neutron (n) radiation consists of free neutrons which are blocked using light elements, like hydrogen, which slow and/or capture them. Non Ionizing radiation. Radiation that . . . has enough energy to move atoms in a molecule around or cause them to vibrate, but not enough to remove electrons. Examples: Extremely low frequency.. Ionising radiation ionises atoms in all matter including the human body. Ionisation can cause cell damage. In the worst case, the radiation damages cell DNA, which contains genetic information. If the damaged cell survives, it can mutate and reproduce and cancer can occur. Such a harmful effect and its probability increases with the dose of ionising radiation absorbed in the tissue.
At high ionizing radiation levels, such as the acute doses received near the Hiroshima and Nagasaki bomb blasts, the risk of cancer does increase roughly linearly with dose, which is the origin of the LNT model. Thus, there is a consensus that the LNT method should continue to be used because it is safer from a regulatory perspective and because the effects of very low radiation doses are too small to be measured statistically. See the National Academies Press book.. Alpha radiation represents the nucleus of helium atoms that are often called alpha particles (α). They are positively charged particles with two protons and two neutrons. On an atomic scale, these particles are big. When such particles enter into matter, they see other atoms as small particles that are tightly bonded. Alpha particles cannot penetrate into these tightly bond structures. Since these particles are slow and heavy their range in solid matter is only a few µm and in the air a few mm. If an alpha source is outside the body, the alpha radiation will not cause any harm to the human body since radiation will not reach the skin. Alpha radiation cannot penetrate through a sheet of paper. Longer wave length, lower frequency waves (heat and radio) have less energy than shorter wave length, higher frequency waves (X and gamma rays). Not all electromagnetic (EM) radiation is ionizing. Only the high frequency portion of the electromagnetic spectrum which includes X rays and gamma rays is ionizing. Artificial ionizing radiation: This could include having received radiation therapy for a previous cancer, although this is a more significant risk factor for some types than others. Certain viruses: The human..
Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons The activities to which radiation safety provisions apply are defined as “practices” or “interventions”. Practices are those human activities involving radiation exposures, or the potential of radiation exposure, for which radiation safety provisions can be planned in advance. Interventions are those human activities that seek to reduce or avert radiation exposures, or likely of incurring exposure, in those situations in which the sources are not part of a currently controlled practice or are out of control as a consequence of an accident. To achieve the objectives of the protection of individuals and public health as they relate to practices, a system of protection founded on basic principles is needed: 1. Beta particles __________________. A. are big and slow B. come from the sun C. are small and fast D. have two protons and two neutrons in their nuclei.
Ionizing radiation—UV, x-rays, and gamma rays—has enough energy in one photon (quantized minimum packet of light) to remove electrons from atoms or break apart chemical bonds Germline mutations of the reproductive tissues result in a variety of transmissible lesions. They may manifest as hereditary disorders. Since the substances are characterized by radiation - because there is a lot of instability of the particles present in the radioactive materials, it can seriously affect, alter and even destroy plant..
NIH Non-Ionizing Radiation Program (NIRP). Non-ionizing radiation (NIR) permeates the world around us and exists in many forms on the electromagnetic spectrum, from radio waves to.. The dose limits for apprentices aged 18 years or over and students aged 18 years or over who, in the course of their studies, are obliged to use sources shall be the same as the dose limits for exposed workers. The limit for the effective dose for apprentices aged between 16 and 18 years and for students aged between 16 and 18 years who, in the course of their studies, are obliged to use sources shall be 6 mSv per year. The applications of ionizing radiation bring many benefits to humankind, ranging from power generation to uses in medicine, industry and agriculture. Irradiators that utilize ionizing radiation are.. Cosmic Radiation. From SKYbrary Wiki. Article Information. Any ionising radiation can displace charged particles, which means that molecules within the cell walls of living organisms can be disrupted Various types of radiation including ionizing radiation may cause harm to people, researchers, and students under different situations. This problem set is designed to help you calculate how much..
Usually occurs after radiotherapy. This is the consequence of irradiated tissue tending to become less elastic over time due to a diffuse scarring process. HSE provides information on ionising radiation and non-ionising radiation. Non-ionising radiation (NIR) is the term used to describe the part of the electromagnetic spectrum covering two main regions.. Although radiation may cause cancer at high doses and high dose rates, public health data regarding lower levels of exposure, below about 1,000 mrem (10 mSv), are harder to interpret. To assess the health impacts of lower radiation doses, researchers rely on models of the process by which radiation causes cancer; several models have emerged which predict differing levels of risk. For women, there are special limitations during pregnancy or breast feeding. Pregnant woman can work in a radiation area but the dose to the foetus must be below 1 mSv during pregnancy. Breast feeding woman can work in a radiation area when only exposure to external radiation is possible (X-ray devices or encapsulated radioactivity sources). In that case, the limit of 20 mSv per year applies. A breastfeeding mother is not allowed to work in an area where contamination and intake of radioactivity is possible. As soon as a breastfeeding woman informs the undertaking of her condition, she shall not be employed in work involving a significant risk of bodily radioactive contamination. In the picture at left, gamma rays are represented by wavy lines, charged particles and neutrons by straight lines. The little circles show where ionization processes occur.
Some ionizing radiation penetrates the earth's atmosphere and becomes absorbed by humans The ionizing radiation that comes from artificial sources and activities is controlled more carefully Non-ionizing (or non-ionising ) radiation refers to any type of electromagnetic radiation that does In contrast, ionizing radiation has a higher frequency and shorter wavelength than non-ionizing..
It manifests after a high dose whole-body irradiation greater than 1-2Gy delivered in a period between a few minutes and a few hours. Whatever the severity of injury or the cinical form, there will be an initial reaction characterized by nausea, vomiting, diarrhea, a feeling of malaise and fatigue. This phase does not exceed a few hours. Then a latency period will follow which for doses less than 8Gy lasts from 5-14hours (in that time no symptoms). According to the dose received the symptoms occur either in the hematopoietic system, the GIT or the CNS. Radiation is also useful in sterilizing medical hardware or food. The advantage for medical hardware is that the object may be sealed in plastic before sterilization. For food, there are strict regulations to prevent the occurrence of induced radioactivity. The growth of a seedling may be enhanced by radiation, but excessive radiation will hinder growth.
Ionizing radiation definition, any radiation, as a stream of alpha particles or x-rays, that produces ionization as it passes through a medium. British Dictionary definitions for ionizing radiation For comparison, the 'background' dose of natural radiation received by a US citizen is around 3 mSv (300 mrem) per year. The lethal dose of radiation for a human is around 4 - 5 Sv (400 - 500 rem). radiation sickness, radiation syndrome, radiation(noun). syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses.. Exposure to ionizing radiation over an extended period of time is called chronic exposure. The natural background radiation is chronic exposure, but a normal level is difficult to determine due to variations. Geographic location and occupation often affect chronic exposure. Ionising radiation can be described as the transfer of energy in the form of particles (such as alpha and beta particles) or electromagnetic waves (such as X-rays and gamma rays) of a wavelength of 100 nanometres or less or a frequency of 3 x 1015 hertz or more capable of producing ions directly or indirectly. Ionising radiation can occur naturally (e.g. from the radioactive decay of natural radioactive substances such as radon gas and its decay products) or it can be generated artificially (e.g. man-made radioactive substances or the operation of certain electrical equipment, such as X-ray sets, which emit ionising radiations). Ionising radiation has many uses in industry, such as energy production, manufacturing, medicine and research and produces many benefits to society. However, ionising radiation attacks the cells of the body by producing chemical changes in the cell DNA, leading to abnormal cell growth, therefore it is important that exposures are managed sensibly to protect workers. The effect on body tissues will depend on: the type of radiation, the dose and duration of exposure and whether the source is internal or external to the body. A criterion and three principles for control (time, distance and shielding) are used to ensure that ionising radiation exposure is kept to a minimum.