EXPOSURE
Roentgen (R), the charge produced in air by x or gamma rays. The SI unit is in terms of
coulombs per kilogram of air (C kg-1).
1 R = 2.58 x 10^-4 C kg-1 1 C kg-1 = 3,876 R
KERMA
(Kinetic Energy Released in Material)
The SI unit is the gray.
1 gray (Gy) = 100 rad 1 rad = 0.01 Gy
An exposure of 1 R (2.58 x 10^-4 C kg-1) corresponds to an air kerma of about 0.87 rad
(8.7 mGy) or a tissue kerma of about 0.97 rad (9.7 mGy).
RADIATION ABSORBED DOSE
The SI unit is the gray (Gy).
1 gray = 100 rad 1 rad = 0.01 Gy
RADIATION DOSE EQUIVALENT
The SI unit is the sievert (Sv).
1 sievert (Sv) = 100 rem 1 rem = 0.01 Sv
ACTIVITY
The SI unit of activity is the becquerel (Bq).
1 becquerel (Bq) = 1 disintegration per second
1 Bq = 2.7 x 10^-11 Curie (Ci) 1 Ci = 3.7 x 1010 Bq = 37 Gbq
ADDITIONAL USEFUL CONVERSIONS COMMON PREFIXES FOR SI
UNITS 1 uCi = 37 kBq Submultiples
Multiples
1 mCi = 37 MBq 10^-3 milli m 10^3 kilo k
1 Bq = 27 pCi 10^-6 micro u 10^6 mega M
370 MBq = 10 mCi 10^-9 nano n 10^9 giga G
1 uSv = 0.1 mrem 10^-12 pico p 10^12 tera T
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