International exercise on ~(124)Sb activity measurements

摘要

An international exercise, registered as EUROMET project no. 907, was launched to measure both the activity of a solution of ~(124)Sb and the photon emission intensities of its decay. The same solution was sent by LNE-LNHB to eight participating laboratories. In order to identify possible biases, the participants were asked to use all possible activity measurement methods available in their laboratory and then to determine their reference value for comparison. Thus, measurement results from 4(pi)(beta)-gamma coincidence/anti-coincidence counting, CIEMAT/NIST liquid-scintillation counting, 4(pi)(gamma) counting with well-type ionization chambers and well-type crystal detectors were given. The results are compared and show a maximum discrepancy of about 1.6percent: possible explanations are proposed.