173.434—Activity-mass relationships for uranium and natural thorium.
The table of activity-mass relationships for uranium and natural thorium are as follows:
| Thorium and uranium enrichment 1(Wt% 235 U present) | Specific activity | |||
|---|---|---|---|---|
| TBq/gram | Grams/Tbq | Ci/gram | Grams/Ci | |
| 0.45 (depleted) | 1.9×10−8 | 5.4×107 | 5.0×10−7 | 2.0×106 |
| 0.72 (natural) | 2.6×10−8 | 3.8×107 | 7.1×10−7 | 1.4×106 |
| 1.0 | 2.8×10−8 | 3.6×107 | 7.6×10−7 | 1.3×106 |
| 1.5 | 3.7×10−8 | 2.7×107 | 1.0×10−6 | 1.0×106 |
| 5.0 | 1.0×10−7 | 1.0×107 | 2.7×10−6 | 3.7×105 |
| 10.0 | 1.8×10−7 | 5.6×106 | 4.8×10−6 | 2.1×105 |
| 20.0 | 3.7×10−7 | 2.7×106 | 1.0×10−5 | 1.0×105 |
| 35.0 | 7.4×10−7 | 1.4×106 | 2.0×10−5 | 5.0×104 |
| 50.0 | 9.3×10−7 | 1.1×106 | 2.5×10−5 | 4.0×104 |
| 90.0 | 2.1×10−6 | 4.7×105 | 5.8×10−5 | 1.7×104 |
| 93.0 | 2.6×10−6 | 3.9×105 | 7.0×10−5 | 1.4×104 |
| 95.0 | 3.4×10−6 | 3.0×105 | 9.1×10−5 | 1.1×104 |
| Natural thorium | 8.1×10−9 | 1.2×108 | 2.2×10−7 | 4.6×106 |
| 1 The figures for uranium include representative values for the activity of uranium-234 which is concentrated during the enrichment process. The activity for thorium includes the equilibrium concentration of thorium-228. | ||||
[Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, as amended by 63 FR 52849, Oct. 1, 1998]