The Half-lives of 132La and 135La
Abstract
The half-lives of 135La and 132La were determined via gamma spectroscopy and high-precision ionization chamber measurements. The results are 18.930(6) h for 135La and 4.59(4) h for 132La compared to the previously compiled values of 19.5(2) h and 4.8(2) h, respectively. The new results represent an improvement in the precision and accuracy of both values. These lanthanum isotopes comprise a medically interesting system with positron emitter 132La and Auger electron emitter 135La forming a matched pair for internal diagnostics and therapeutics. The precise half-lives are necessary for proper evaluation of their value in medicine and for a more representative tabulation of nuclear data.
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