Therefore, to convert from the mrem values above to mSv millisievert , divide the value by Radiation Dose Calculator We live in a radioactive world - humans always have. Common Sources of Radiation All figures for radiation exposure are average values. Where You Live Annual Dose Cosmic Radiation from outer space Exposure depends on your elevation how much air is above you to block radiation.
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The corresponding international unit for effective dose is the millisievert mSv. Skip to main content. Radiation Protection.
Contact Us. How to use this calculator Use the calculator below to estimate your yearly dose dose Dose is defined as the amount of radiation or energy absorbed by a person's body.
Some entries for the yearly dose calculator are already filled in. Environmental Protection Agency. The average exposure in the United States, from natural sources of radiation mostly cosmic radiation and radon , is millirems per year at sea level. Radiation exposure is slightly higher at higher elevations-thus the exposure in Denver averages millirems per year. According to McGraw-Hill's Dictionary of Scientific and Technical Terms, a Rem is a unit of ionizing radiation equal to the amount that produces the same damage to humans as one roentgen of high-voltage x-rays.
The name is derived from "Roentgen equivalent man. All of these limits are for the amount of radiation exposure in addition to background radiation and medical radiation. Radiation workers wear badges made of photographic film which indicate the exposure to radiation. Readings typically are taken monthly. A federal advisory committee recommends that the lifetime exposure be limited to a person's age multiplied by 1, millirems example: for a year-old person, 65, millirems.
This was established in and reviewed as recently as New federal regulations went into effect New Year's Day, establishing for the first time an exposure limit for the embryo or fetus of a pregnant woman exposed to radiation at work.
The limit for the gestation period is millirems, with a recommendation that the exposure of a fetus be no more than 50 millirems per month. Like alcohol intoxication levels, levels of exposure to radioactivity due to radioactivity deposited in the body depend on a person's weight. A diagnostic tracer of one microcurie of radioactive calcium 45, given orally, would result in an exposure of 3. Therapeutic radiation treatment that is delivered by administering radioactive material via the mouth or by injection usually results in high, very localized doses to a small part of the body, which absorbs most of the radioactivity.
The radioactivity concentrates and remains in the target organ for example, the thyroid for a longer period of time than does the radioactivity that is distributed to the rest of the body.
The radiation exposure for other parts of the body is a function of the amount of radioactivity per pound and the time the radioactivity is present in the tissue. For example, a hyperthyroid problem such as that experienced by former President George Bush is typically treated with a radioactive iodine drink designed to deliver about 10,, millirems of radioactive iodine to the thyroid.
It would coincidentally deliver a dose to the rest of the body of about 20, millirems. A slightly lower dose of radioactivity is used for cancerous tumors.
Radiation to kill a cancerous tumor often involves a beam delivering 6,, millirems to the cancerous tissue, but the whole-body equivalent dose is much less, as it was in the thyroid example cited above. What is a lethal dose from a single instance of radiation?
According to studies made after the atomic bomb explosions in at Hiroshima and Nagasaki, half of the people died whose entire bodies were exposed to , millirems of radiation from the atomic bomb. All persons died whose bodies were exposed to , millirems of radiation. This also was the annual occupational limit for adults from World War II through
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