Speaker
Description
Coincidence-summing effects play a significant role in present-day gamma ray spectrometry. The evaluation of the corresponding correction factors (FC) and of the associated uncertainties is an important issue for the Gamma-Ray Spectrometry Working Group (GSWG) of the ICRM, being the subject of several intercomparisons.
In this work the uncertainties and the covariance matrix of the FC values due to the uncertainties of the decay data parameters were evaluated for the main emissions Ei of Co-60, Y-88, Ba-133, Cs-134 and Eu-152. Other contributions to FC uncertainty, due to measurement conditions and radiation transport, were switched off by preparing in advance (Monte Carlo) the required set of joint detection probabilities of all the relevant cascading photons. The effect of the decay data uncertainties was evaluated by constructing sets of decay schemes for the same nuclide, with different values of the parameters, sampled from distributions based on the values V and uncertainties s listed in the decay data base (DDEP). Typically normal distributions N(V,s) were used, but in the case when a parameter is listed as
