Decay ofSb125

Abstract

Eleven gamma rays between 0.100 and 0.637 Mev have been identified in the decay of ${\mathrm{Sb}}^{125}$. From their relative intensities as measured with a sodium iodide crystal 3 inches in diameter and 3 inches high, and with the assistance of coincidence spectrometry, a decay scheme may be constructed which is consistent with all the data. The half-life for ${\mathrm{Sb}}^{125}$ was determined as 2.0±0.2 years.