Conversion electron emission probabilities for efficiency calibration of electron detectors and spectrometers

The low energy efficiency calibration of electron detectors is performed with good calibration standards in many online and offline facilities for beta and conversion electron spectroscopy. Long lived radioisotopes with distinct and strong conversion lines are preferred for this purpose. The relative conversion electron intensities were corrected for the transmission of the spectrometer. These intensities were converted into conversion electron probabilities (per 100 decays) by using the experimental gamma ray intensities measured with our HPGe detector system. The value of the multiplicative factor for obtaining the gamma ray emission probability (pγ) and a standard conversion coefficient in the same decay, were taken from the adopted values given in the ENSDF database. The conversion electron intensities per 100 decays given in the article, arranged in increasing order of conversion electron energies from 12 keV to 350 keV. Individual conversion lines are designated with the corresponding gamma transition energy in keV. As these measurements are relatively of high precision, and are well spaced in the said energy range, this conversion electron intensity data would be of great use for the calibration of Si(Li) detectors and associated electron spectrometers