Common Conversions and Prefixes

Roentgen

represented by “R”, is the unit of measurement that indicates the charge produced in air by x or gamma rays, whereas SI Units are n terms of coulombs per kilogram of air (C kg-1).

1R = 2.58 X 10-4 C kg-1

Radiation Absorbed Dose and KERMA (Kinetic Energy Released in Material)

100 rad = 1 gray (Gy) 0.01 Gy = 1 rad

Radiation Dose Equivalent

100 rem = 1 sievert (Sv) 0.01 Sv = 1 rem
1 µSv = 0.1 mrem

Activity

1 disintigration per second = 1 becquerel (Bq)
2.7 X 10-11 curie (Ci) = 1 Bq
1 µCi = 37 kBq
1 mCi = 37 MBq
1 Bq = 27 pCi
370 MBq = 10 mCi

SI Unit Prefixes

10-3 milli m
10-6 micro µ
10-9 nano n
10-12 pico p
103 kilo k
106 mega M
109 giga G
1012 tera T


 

Common Units

0.001 mSv

 = 1 µSv
= 0.1 mR
= 100 µR

1 mR

= 1000 µR
= 0.01 mSv
= 10 µSv

100 mR

= 1 mSv
= 1000 µSv
= 100,000 µR

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