The K-fluorescence yield of Te and the total and K-shell conversion coefficients of the 35.48 keV transition in 125I decay

Abstract

High-resolution Ge(Li) X-ray spectrometers were used in the singles and coincidence modes to determine the K-fluorescence yield of Te from carrier-free sources of 125I. The same experiments give the total and K-shell conversion coefficients of the 35.48 keV transition in 125Te. The values found for ω K, α T and α K are 0.859±0.022, 13.65±0.55 and 12.01±0.36, respectively, assuming that the K-capture probability in 125I decay is P K = 0.797±0.003. The values of α T and α K agree with the theoretical prediction of Hager and Seltzer for an M1 transition with less than 0.4% E2 admixture.