Geology topics
T. A. Farley
Publications and source records attributed to T. A. Farley.
Half-life of Th232 and the branching ratio of Bi212
The half-life of Th 232 has been calculated by determining an absolute gamma-disintegration rate for Tl 208 in equilibrium with Th 232 for three old thorium nitrate salts and one natural thorite sample. The branching ratio, α/ ( α + β ) , for Bi 212 , a necessary parameter in the calculation, was also measured. The half-life of Th 232 was found to be 1.42× 10 10 years within an estimated error of 5%, which is essentially in agreement with the presently accepted value. The branching ratio, α/ ( α + β ) , of Bi 212 was found to be 0.362±0.006, about 7.4% higher than the currently accepted value.
The half life of Th232 and the branching ratio of Bi212
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A theoretical study of alpha star populations in loaded nuclear emulsions
This theoretical study of the alpha star populations in loaded emulsions was undertaken in an effort to find a quantitative method for the analysis of less than microgram amounts of thorium in the presence of larger amounts of uranium. Analytical expressions for each type of star from each of the significantly contributing members of the uranium and thorium series as well as summation formulas for the whole series have been computed. The analysis for thorium may be made by determining the abundance of five-branched stars in a loaded nuclear emulsion and comparing of observed and predicted star populations. The comparison may also be used to check the half-lives of several members of the uranium and thorium series.
Theoretical alpha star populations in loaded nuclear emulsions
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