Radioactivity & Radioisotopes
- Units, Formulas, & Cconversions
- Common Isotope Properties
- Isotope Data & Tables
- Decay Calculators
- 35S Decay Table
- 125I Decay Table
- 32P Decay Table
- 131I Decay Table
- 33P Decay Table
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 |
Common isotope properties
| 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 |
Isotope Data & Tables
Radioactive calculator at PerkinELmer
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
35S Decay Table - half-life = 87.4 days
125I Decay Table - half-life = 60.0 days
33P Decay Table - half-life = 25.4 days
32P Decay Table - half-life = 14.3 days
131I Decay Table - half-life = 8.04 days
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