Abstract
An end-window gas-flow proportional counter system, including an automatic precision sample changer, was used to measure the decay of radiations from two samples of {sup 44}Ti and one of {sup 207}Bi. Comparison counts were taken on a {sup 36}Cl standard, and the ratio of counts determined the decay. Points consisted of alternate 30-min counts on each sample and on the standard, totaling 30 h on each, and were taken at intervals of about one month. Based on 3 years of counting on the {sup 207}Bi source and on one of the {sup 44}Ti sources, and 1 year on the second {sup 44}Ti sample, half-lives were obtained as follows: {sup 44}Ti, 66.6(16) yr and {sup 207}Bi, 34.9(4) yr. The {sup 207}Bi value lies between the two most recently reported values. In the case of {sup 44}Ti there are discrepancies with all three previous results including an Argonne accelerator mass spectroscopy value of 54.2(21) yr.
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