Table 2, Table 3, Table 4
Table 2
Relationship Between A1 and E max for Beta Emitters
| E max (MeV) | A1(Ci) |
|---|---|
| < 0.5 | 1000 |
| 0.5 – < 1.0 | 300 |
| 1.0 – < 1.5 | 100 |
| 1.5 – < 2.0 | 30 |
| 2.0 | 10 |
Table 3
Relationship Between A3 and the Atomic Number of the Radionuclide
| A3 | |||
|---|---|---|---|
| Atomic Number | Half-life less than 1000 days | Half-life 1000 days to 104 years | Half-life greater than 104 years |
| 1 to 81 | 3 Ci | 0.05 Ci | 3 Ci |
| 82 and above | 0.002 Ci | 0.002 Ci | 3 Ci |
Table 4
Activity-Mass Relationships for Uranium/Thorium
| Thorium and Uranium Enrichment* wt % U-235 present | Specific Activity | |
|---|---|---|
| Ci/g | g/Ci | |
| 0.45 | 5.0 X 10-7 | 2.0 X 10 6 |
| 0.72(natural) | 7.06 X 10-7 | 1.42 X 10 6 |
| 1.0 | 7.6 X 10-7 | 1.3 X 10 6 |
| 1.5 | 1.0 X 10-6 | 1.0 X 10 6 |
| 5.0 | 2.7 X 10-6 | 3.7 X 10 5 |
| 10.0 | 4.8 X 10-6 | 2.1 X 10 5 |
| 20.0 | 1.0 X 10-5 | 1.0 X 10 5 |
| 35.0 | 2.0 X 10-5 | 5.0 X 10 4 |
| 50.0 | 2.5 X 10-5 | 4.0 X 10 4 |
| 90.0 | 5.8 X 10-6 | 1.7 X 10 4 |
| 93.0 | 7.0 X 10-6 | 1.4 X 10 4 |
| 95.0 | 9.1 X 10-6 | 1.1 X 10 4 |
| Natural Thorium | 2.2 X 10-7 | 4.6 X 10 6 |
*The figures for uranium include representative values for the activity of the uranium-234 which is concentrated during the enrichment process. The activity for thorium includes the equilibrium concentration of thorium-228.