How to use this calculator
Use the calculator below to estimate your yearly doseDose is defined as the amount of radiation or energy absorbed by a person's body. from the most significant sources of ionizing radiationRadiation with so much energy it can knock electrons out of atoms. Ionizing radiation can affect the atoms in living things, so it poses a health risk by damaging tissue and DNA in genes.. Estimates are given in milliremThe millirem is the U.S. unit used to measure effective dose. One millirem equals 0.001 rem. The international unit is milliSievert (mSv). (mrem)one thousandth of a rem, the U.S. unit for effective dose. Effective dose is a measure of the amount of radiation absorbed by a person that accounts for the type of radiation received and the effects on particular organs. (The corresponding international unit for effective dose is the millisievert (mSv).)
According to the National Council on Radiation Protection and Measurements (NCRP), the average yearly radiation dose per person in the U.S. is 620 mrem.
Related information in Spanish (Información relacionada en español)
Directions
- Enter values or select entries where options are provided. Some entries for the yearly dose calculator are already filled in.
Applying the precautionary principle and setting cautious limits
Annual exposure limits beyond medicine and natural radioactivity
These annual limits for exposure of the population are those of the public health code. These limits apply to the total effective dose or equivalent received outside of natural radioactivity and medicine, including those
resulting from nuclear activities. The maximum permissible dose of 1 mSv per year represents approximately 40% of natural exposure. (For the skin, it is the average dose per cm2 of skin, regardless of the display surface).
French regulations set at 1 mSv (milliSievert
The limit of 1 mSv / year is for the general public. It compares with the average exposure (outside medical and natural radioactivity) which was of 0.060 mSv / year in France, where exposure to nuclear that concerns the public represents only a part. For people who work with ionizing radiation, the limit is 100 mSv for a set of 5 consecutive years, where the maximum for one year must not exceed 50 mSv.
These limits apply to the total effective dose (or total equivalent dose) received by “ordinary” individuals during a year. The same goes for total equivalent doses. Their surpassing is unacceptable in principle. These limits, however, lend themselves to some confusion. The fact that the natural and medical exposures are excluded is generally forgotten or omitted.
In a developped european country like Frnance, the French population is exposed each yar to an averge effective dose of 3.7 mSv per capita. These 3.7 mSv are divided into 2.5 mSv of natural radioactivity, 1.1 mSv of medical origin and 0.06 mSv of radiation linked to other human activities including nuclear.
The limit of 1 mSv per year might seem excessive, compared with 0.06 mSv due to human activities once ruled out the medical part and even more to 0.002 mSv for the impact of a nuclear power plant. A dose of 1 mSv is considered as a very low radiation dose.
The ICRP (International Commission on Radiological Protection) evaluates as follows its effects by applying the no-threshold linear model : 1 mSv exposition would triggers up to 50 fatal cancers, 10 treatable cancers and 13 genetic diseases per million. These figures compare with the 250,000 cancers that will affect one day, all causes merged, this million people
Annual exposure limits for workers
Annual exposure limits for people needing to be exposed to radiation
because of their activity, particularly nuclear workers and staff of nuclear medicine. In the case of pregnant women, it is the exposure of the unborn child. Exemptions in advance justified are allowed in some areas of work and for a limited period. They require a special permit. These special exposures must not exceed two times the legal annual exposure limit.
On the other hand, exposure to radiation of natural and medical origin varies considerably from person to person. These variations, especially because of diagnoses and medical treatments, blithely exceed the limit for the third leading cause of exposure... If one applied a limit of 1 mSv to these two causes, we could not undergo a scan, we should abandon aircraft, mountain climbing, avoid living in Brittany or in Corsica.
The cells of our body do not differentiate between rays of a natural or medical origin and
that of a nuclear power plant. If fluctuations in the exposure of a person to person exceed 1 mSv because of habitat or medical diagnostics and treatments that prolong our lives, it seems illusory to reduce an already low limit since the third source exposure is minor in comparison. The limit makes sense only if very low doses trigger cancers: dose reduction of the third type then remove some cancers. But the effect of low doses is highly uncertain and it is quite possible that they have no
effect. However because of the uncertainty on the low dose effects, one applies the precautionary principle.
In the case of a major accident : Apply the principle of limitation
Finally, one must provide exceptional measures for radioprotection of the population in case of accident or radiological emergency. Actions and counter measures are implemented according to the nature and extent of exposure. In the case of nuclear accidents, intervention levels
expressed in terms of doses are used as benchmarks for governments to decide on a case by case, the actions to put in place:
- Sheltering the population in a safe place, if the predicted effective dose exceeds 10 mSv;
- Evacuation, if the predicted effective dose exceeds 50 mSv;
- Administration of stable iodine, when the thyroid dose is likely to exceed 100 mSv.
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