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The half-lives of $^{135}$La and $^{132}$La were determined via gammaspectroscopy and high-precision ionization chamber measurements. The resultsare 18.930(6) h for $^{135}$La and 4.59(4) h for $^{132}$La compared to thepreviously compiled values of 19.5(2) h and 4.8(2) h, respectively. The newresults represent an improvement in the precision and accuracy of both values.These lanthanum isotopes comprise a medically interesting system with positronemitter $^{132}$La and Auger electron emitter $^{135}$La forming a matched pairfor internal diagnostics and therapeutics. The precise half-lives are necessaryfor proper evaluation of their value in medicine and for a more representativetabulation of nuclear data.

The Half-lives of $^{132}$La and $^{135}$La