Neutron absorption in supermirror coatings: Effects on shielding
Rodion Kolevatov, Christian Schanzer, Peter Boeni
TL;DR
This paper quantifies neutron absorption in supermirror coatings, highlighting its impact on gamma radiation emission, which is crucial for designing effective shielding in neutron beamlines.
Contribution
It provides a new calculation method for neutron absorption in supermirror coatings and a parameterization of absorption probability based on momentum transfer.
Findings
Neutron absorption leads to gamma ray emission in coatings.
Absorption probability depends on momentum transfer.
Results aid in shielding design for neutron beamlines.
Abstract
The quantification of the dose rate and the composition of the dose in the vicinity of supermirror coated guides is essential for designing shielding for beamlines transporting neutrons with a high flux. We present results on a calculation of radiative neutron absorption in Ni/Ti and NiMo/Ti supermirror coatings which leads to the emission of high energy gamma rays. A simple parameterization of the absorption probability in the coating materials per incident neutron is given as a function of momentum transfer at reflection.
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