Radiation measurement units | ||
Radioactivity | ||
Unit |
Becquerel
(Bq) (International or SI unit) |
Curie
(Ci) (Obsolete unit) |
How the unit is derived | Radioactivity represents the rate of radioactive decay. One becquerel (Bq) is equal to one radioactive decay per second. | One curie (Ci) is the approximate number of radioactive decays in one gram of radium per second – approximately 3.7 x 1010 decays per second. |
Conversions | 1 becquerel (Bq) = 2.703×10−11 curie (Ci) | 1 curie (Ci) = 3.7 x 1010 becquerel (Bq) |
Common Metric Prefixes | 1 gigabecquerel (GBq) =
1,000,000,000 Bq 1 megabecquerel (MBq) = 1,000,000 Bq 1 kilobecquerel (kBq) = 1,000 Bq |
1 millicurie (mCi) = 0.001 Ci
1 microcurie (µci) = 0.000 001 Ci 1 picocurie (pCi) = 0.000 000 000 001 Ci |
Absorbed Dose | ||
Unit |
Gray
(Gy) (International or SI unit) |
Rad
(rad) (Obsolete unit) |
How the unit is derived | Absorbed dose is energy per unit mass. 1 gray (Gy) = 1 joule(J)/kilogram(kg) | 1 rad = 0.01 joule(J)/kilogram(kg) |
Conversions | 1 gray (Gy) = 100 rad | 1 rad = 0.01 gray (Gy) |
Common Metric Prefixes | 1 centigray (cGy) = 0.01 Gy 1 milligray (mGy) = 0.001 Gy |
1 millirad (mrad) = 0.001 rad 1 kilorad (krad) = 1,000 rad |
Effective dose | ||
Unit |
Sievert (Sv) |(International or SI unit) | Rem
(rem) (Obsolete unit) |
Conversions | 1 sievert (Sv) = 100 rem | 1 rem = 0.01 sievert (Sv) |
Common Metric Prefixes | 1 millisievert (mSv) = 0.001
Sv 1 microsievert (µSv) = 0.000 001 Sv |
1 millirem (mrem) = 0.001 rem
1 microrem (µrem) = 0.000 001 rem |
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