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For comparison, radiation levels inside the United States Capitol are 85 mrem/yr (0.85 mSv/yr), close to the regulatory limit, because of the uranium content of the granite structure. [14] The NRC sets the annual total effective dose of full body radiation, or total body radiation (TBR), allowed for radiation workers 5,000 mrem (5 rem). [15] [16]
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.
The worldwide average natural dose to humans is about 2.4 mSv (240 mrem) per year. [2] This is four times the worldwide average artificial radiation exposure, which in 2008 amounted to about 0.6 millisieverts (60 mrem) per year.
Flight-time equivalent dose (FED) is an informal unit of measurement of ionizing radiation exposure. Expressed in units of flight-time (i.e., flight-seconds, flight-minutes, flight-hours), one unit of flight-time is approximately equivalent to the radiological dose received during the same unit of time spent in an airliner at cruising altitude.
Radiation fluence is the number of radiation particles impinging per unit area per unit time, ... 100,000.0 mrem = 1 Sv = 1.000000 Sv = 1000.000 mSv = 1,000,000 μSv
The radiation dose for a six-hour flight is 20 μSv (2 mrem) – 200 to 400 times larger than a backscatter scan. The Nuclear Regulatory Commission limits radiation exposure to the public to less than 1 mSv (100 mrem) per year from nuclear power plants. [51]
New findings released from 2021 contamination incident at plant near Richland, WA.
The radiation dose limit for the personnel was set to 500 mrem (5 mSv) per source preparation. Sometimes this limit was exceeded; once the received dose was 2 rem (20 mSv). Sometimes this limit was exceeded; once the received dose was 2 rem (20 mSv).