Working group actions

Starting with the ICRM 2005 conference, the GSWG members participated in a series of exercises to compare codes as applied to detector calibration. The exercises addressed problems such as direct computation of efficiency, application of Monte Carlo codes to efficiency transfer, computation of coincidence summing corrections in various cases. The results of the most recent exercises (self-consistency of the methods applied for the evaluation of coincidence summing corrections and benchmark for Monte Carlo simulation) were presented during the ICRM 2019 conference in Salamanca.

On-going actions

Simple exercise on self-consistency of the methods applied for the evaluation of coincidence summing corrections in the case of volume sources

Coordination: Octavian Sima

An action to test the internal self-consistency of the methods applied to evaluate coincidence-summing corrections for extended sources is proposed. While internal consistency does not guarantee the correctness of the method, if it is not satisfied, it points out that the method has some shortcomings and its validity has specific limitations. The proposed self-consistency test is based on exact relations that should be fulfilled in the case of specific ideal measurement configurations. More precisely, the results obtained using any computation method for one such configuration should be related by exact equations to the results given by the same method for other configurations. Thus, this test does not require experimental data (avoiding the problem of experimental uncertainties) or comparisons of a method with other methods (avoiding the debate concerning the selection of a particular reference method). Specifically, the participants in this exercise are asked to evaluate the coincidence-summing correction factors for several peaks of Co-60, Cs-134, Ba-133 and Eu-152 for one detector and 3 volume source geometries.

Further information is available here.

Action to facilitate the use of Monte Carlo simulation software

Coordination: Marie-Christine Lépy

To facilitate the use of generalist Monte Carlo (MC) simulation software (GEANT, MCNP, PENELOPE, etc.), it is proposed to prepare geometrical files for a selection of detectors (HPGe) and measurement conditions including volume samples and external shielding. The participants will contribute to prepare benchmark files specific to the different MC codes. Two cases must be considered since GEANT code, which is object-oriented and run under UNIX, must be compiled including the geometry while the other codes are written in FORTRAN and run with an external geometry file. To test the feasibility of the action, the action will start on study-case models with simple cylindrical detectors. It should be easy to prepare a first set of input data for these simple cases and come to an agreement between the participants on a common structure. It will be necessary to define a file structure that could be easily modified by an external user or by a dedicated user-friendly code.

Further information is available here.