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/snip/
1Gy (dose of one Gray) is when 1 kg of body tissue absorbs
1 joule of energy. The older unit of dose, 1 rad, is the same as
0.01 Gy or 10 mGy.
For x rays one can assume that 1 rem=1 rad (or 1 Sv = 1 Gy).
Brian quoted (see below) the average yearly
dose of 3600 mSv (360 mrad).
Ludwik Kowalski