Abstract
The conversion electrons from the decay of the 35.5-keV excited state of Te-125 following the electron capture decay of I-125 have been investigated at high resolution using an electrostatic spectrometer. The penetration parameter lambda = -1.2(6) and mixing ratio vertical bar delta(E2/M1)| = 0.015(2) were deduced by fitting to literature values and present data. The shake probability of the conversion electrons is estimated to be 0.5, more than two times larger than the predicted value of 0.2.