Radioactivity & Radioisotopes
Formulas & conversions
        
1 Curie (Ci)  = 2.22 x 10(12) disintegrations/min (dpm) 
              = 37 GBq
1 mCi = 2.22 x 10+9 dpm = 37 MBq
1 µCi = 2.22 x 10+6 dpm = 3.7 X 10+4 Bq = 37 kBq 

1 Becquerel (Bq) = 1 disintegration/s (dps) 
                 = 2.7 x 10-11 Ci 
                 = 2.7 x 10-5 µCi
1 GBq = 27 mCi 
1 MBq = 27 µCi 
1 kBq = 27 nCi

Radioactive decay equation

A=Aoe-( 0.693t/T1/2 )
Ao- original activity
T - half-life
t - elapsed time

        System International (SI) Units for Ionizing Radiation
        
Quantity Unit Name
(Symbol)
Definition Former
Unit
Conversion Factor
Activity Becquerel
(Bq)
Disintegrations/sec Curie
(Ci)
1 Bq = 2.7 x 10-11 Ci
Absorbed Dose Gray
(Gy)
Joule/kilogram rad 1 Gy = 100 rads
Dose Equivalent Sievert
(Sv)
Joule/kilogram rem 1 Sv = 100 rems
        
Isotope Emission Energy (max) MeV
Half Life
14C beta 0.156 (100%)
5,730 years
3H beta 0.0186 (100%)
12.3 years
35S beta 0.167 (100%)
87.4 days
125I gamma - X-ray 0.035 - 0.027, 0.031
60.14 days
51Cr gamma - X-ray - Auger 0.320
27.7 days
33P beta 0.249 (100%)
25.4 days
32P beta 1.709 (100%)
14.3 days
131I gamma - beta 0.364 - 0.61
8.04 days
111In gamma - X-ray (& others) 0.171 - 0.023, 0.026
2.83 days
123I gamma, ec 0.159
13 hours
99mTc gamma 0.140
6.01 hours
Radioactive decay, time decay, timed solid disposal calculators, and unit converter at University of British Colombia
Radioactive decay calculator, time decay calculator, and unit converter at University of Washington
varied radioactivity calculation at Graphpad.com

 

 

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