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The sievert (symbol: Sv [note 1] ... (which depends on the body parts irradiated). ... the limit is 50 mSv in a single year with a maximum of 100 mSv in a consecutive ...
Recognized effects of higher acute radiation doses are described in more detail in the article on radiation poisoning.Although the International System of Units (SI) defines the sievert (Sv) as the unit of radiation dose equivalent, chronic radiation levels and standards are still often given in units of millirems (mrem), where 1 mrem equals 1/1,000 of a rem and 1 rem equals 0.01 Sv.
Effective dose is a dose quantity in the International Commission on Radiological Protection (ICRP) system of radiological protection. [1]It is the tissue-weighted sum of the equivalent doses in all specified tissues and organs of the human body and represents the stochastic health risk to the whole body, which is the probability of cancer induction and genetic effects, of low levels of ...
Additional basement and trench-area measurements indicated 60 mSv/h in unit 1, "over 1000" mSv/h [137] in unit 2, and 750 mSv/h in unit 3. The report indicated the main source was iodine-134 [ 138 ] with a half-life of less than an hour, which resulted in a radioactive iodine concentration 10 million times the normal value in the reactor. [ 139 ]
The SI unit of measure for equivalent dose is the sievert, defined as one Joule per kg. [11] In the United States the roentgen equivalent man (rem), equal to 0.01 sievert, is still in common use, although regulatory and advisory bodies are encouraging transition to sievert.
The roentgen or röntgen (/ ˈ r ɛ n t ɡ ə n,-dʒ ə n, ˈ r ʌ n t-/; [2] symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air (statcoulomb per kilogram).
The International Commission on Radiological Protection recommends limiting occupational radiation exposure to 50 mSv (5 rem) per year, and 100 mSv (10 rem) in 5 years. [ 37 ] However, background radiation for occupational doses includes radiation that is not measured by radiation dose instruments in potential occupational exposure conditions.
mSv = millisievert (1/1000 of a sievert), MSv = megasievert (a million sievert). This follows the convention for metric prefixes (similar to mW, milliwatt vs MW, megawatt). In the case of the Sievert, 1 sievert is already a huge amount of radiation likely to kill you, so a megasievert is a ridiculous amount.