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Published on: May 9, 2014
Coincidence summing corrections applied to volume sources.
Marie-Christine Lépy1, Laurent Ferreux, Sylvie Pierre
1CEA-LIST/LNE-LNHB, CE Saclay, 91191 Gif-sur-Yvette, France. marie-christine.lepy@cea.fr
Summary
Calculating coincidence summing corrections for volume sources requires accurate efficiency data. The ETNA software offers simplified and complete methods for these calculations, with the complete method integrating over the entire volume for improved accuracy.
Area of Science:
- Nuclear physics
- Radiochemistry
- Radiation detection and measurement
Background:
- Coincidence summing (CS) corrections are crucial for accurate quantification in gamma-ray spectrometry.
- Volume sources introduce complexities due to the spatial distribution of photon emissions.
- Existing methods often simplify these corrections, potentially leading to inaccuracies.
Purpose of the Study:
- To evaluate the difference between simplified and complete methods for calculating coincidence summing corrections in volume sources using the ETNA software.
- To assess the impact of different geometrical configurations and radionuclides on the accuracy of these methods.
Main Methods:
- Utilized the ETNA software, employing both a "simplified" (point source approximation) and a "complete" (volume integration) deterministic method for CS correction calculations.
- Tested various geometrical setups and selected radionuclides to compare the results from both calculation approaches.
- Analyzed the impact of photon emission position within the radioactive sample on coincidence probability.
Main Results:
- The "complete" calculation method, which integrates over the entire volume, provides a more accurate determination of coincidence summing corrections for volume sources compared to the "simplified" method.
- Differences between the two methods were observed to be dependent on the source geometry and the specific radionuclide's decay characteristics.
- The study highlights the necessity of volume integration for precise CS corrections in non-point-like samples.
Conclusions:
- The "complete" calculation in ETNA is recommended for accurate coincidence summing corrections of volume sources.
- The choice of calculation method significantly impacts the accuracy of quantitative results in gamma-ray spectrometry.
- Further investigations into specific source geometries and radionuclide combinations are warranted to fully understand the discrepancies.
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