Half-life of Th232 and the branching ratio of Bi212
Physical Review
By: F. E. Senftle, T. A. Farley, and N. Lazar
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Abstract
The half-life of Th232 has been calculated by determining an absolute gamma-disintegration rate for Tl208 in equilibrium with Th232 for three old thorium nitrate salts and one natural thorite sample. The branching ratio, α/(α+β), for Bi212, a necessary parameter in the calculation, was also measured. The half-life of Th232 was found to be 1.42×1010 years within an estimated error of 5%, which is essentially in agreement with the presently accepted value. The branching ratio, α/(α+β), of Bi212 was found to be 0.362±0.006, about 7.4% higher than the currently accepted value.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Half-life of Th232 and the branching ratio of Bi212 |
| Series title | Physical Review |
| DOI | 10.1103/PhysRev.104.1629 |
| Volume | 104 |
| Issue | 6 |
| Publication Date | December 15, 1956 |
| Year Published | 1956 |
| Language | English |
| Publisher | American Physical Society |
| Description | 4 p. |
| First page | 1629 |
| Last page | 1632 |