Abstract
Activation of material is of interest for waste treatment and hazard assessment. In particular, activation of printed circuit can lead to the production of radionuclides at an isomeric state, for example, coming from silver. In particle accelerators, the production of silver isomeric states mainly come from low energy neutrons, below 20 MeV. The quantification of activation and associated doses at CERN is based on the FLUKA and ActiWiz codes. In the FLUKA release 2011.2c, all branching ratios for isomer production were set at 50% by default. The present work provides a set of nuclide- and energy-dependent branching ratios, extracted from the library EAF-2010. In the ActiWiz release 3.3, the library JEFF3.1.1 was used for low energy neutron cross-sections. This study provides a new set of neutron cross-sections extracted from JEFF3.3, ENDFB/VIII.0 and EAF-2010 for future update of ActiWiz.
Highlights
Radionuclides produced via nuclear interactions are of strong in terest for radiation protection in nuclear power plants and particle ac celerators, because they are responsible for the phenomenon of induced radioactivity and for the associated radiological risks.Estimates of induced radioactivity can be performed with Monte Carlo codes like FLUKA (Battistoni et al, 2015; Ferrari et al, 2005) and analytical codes like ActiWiz (Theis and Vincke, 2018)
We generated new sets of branching ratios for isomers and neutron cross-sections to update the ones currently used in FLUKA and ActiWiz
A python script tool was written in order to produce these data automatically from any library in ENDF format. This new data will be included in the releases of FLUKA and ActiWiz
Summary
Radionuclides produced via nuclear interactions are of strong in terest for radiation protection in nuclear power plants and particle ac celerators, because they are responsible for the phenomenon of induced radioactivity and for the associated radiological risks. Estimates of induced radioactivity can be performed with Monte Carlo codes like FLUKA (Battistoni et al, 2015; Ferrari et al, 2005) and analytical codes like ActiWiz (Theis and Vincke, 2018). These codes rely on cross-sections for the computation of reaction rates, at least in the case of low energy neutrons as incident particles. FLUKA is a Monte-Carlo calculation code that simulates particle transport and interaction with matter It includes about 60 different particles and can be used for different purposes such as shielding, design, activation, radiotherapy. We present the cases of FLUKA and ActiWiz as examples of application
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