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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]
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).
Dose area product (DAP) is a quantity used in assessing the radiation risk from diagnostic X-ray radiography examinations and interventional procedures, like angiography.It is defined as the absorbed dose multiplied by the area irradiated, expressed in gray-centimetres squared (Gy·cm 2 [1] – sometimes the prefixed units dGy·cm 2, mGy·cm 2 or cGy·cm 2 are also used). [2]
0.7 7 × 10 ^ −1: Acute-Mammogram [7] 1 1 × 10 ^ 0: Annual: 0.11: Limit of dose from man-made sources to a member of the public who is not a radiation worker in the US and Canada [6] [9] 1.1 1.1 × 10 ^ 0: Annual: 0.13: Average USA radiation worker occupational dose in 1980 [6] 1.2 1.2 × 10 ^ 0: Acute-Abdominal X-ray [7] 2 2 × 10 ^ 0 ...
The average radiation dose from an abdominal X-ray is 0.7 millisieverts (0.0007 Sv), that from an abdominal CT scan is 8 mSv, that from a pelvic CT scan is 6 mGy, and that from a selective CT scan of the abdomen and the pelvis is 14 mGy. [7]
It is the absorbed energetic dose before the biological efficiency of the radiation is factored in. The rep has variously been defined as 83 or 93 ergs per gram of tissue (8.3/9.3 mGy) [2] or per cm 3 of tissue. [3] At the time, this was thought to be the amount of energy deposited by 1 roentgen. [4]
The Maggie L. Walker Governor's School for Government and International Studies (MLWGSGIS) is a public regional magnet high school in Richmond, Virginia.. One of the 18 Virginia Governor's Schools, it draws students from 14 jurisdictions: the counties of Chesterfield, Henrico, Hanover, Goochland, Powhatan, Prince George, Charles City, King and Queen, New Kent and Dinwiddie, and the cities of ...
0.7 mSv [9] 175 flight-hours Public dose limit: limit: 1 mSv [15] 250 flight-hours Lumbar spine x-ray: singular: 1.5 mSv [9] 375 flight-hours Background radiation in Toronto, CA: annual: 1.6 mSv [5] 400 flight-hours Brain CT scan: singular: 2 mSv [9] 500 flight-hours Background radiation - worldwide average: annual: 2.4 mSv [5] 600 flight-hours ...