TheK-shell conversion coefficient of the 135.5 keVM4 transition in193mPt decay

TheK conversion coefficient of the 135.5 keVM4 transition in^193mpt has been determined by the XPG method. The result is_K=135.2±10.5 and the value exhibits a deviation 3.4% below the theoretical prediction of Hager and Seltzer. Similar deviations have been systematically observed in precision values ofE3 andM4 conversion coefficients reported in the literature.