Supermirror coating is a significant source of γ-radiation in neutron guide systems, which can cause serious problems at instruments by increasing the γ-background. This problem is more stringent in case of γ-sensitive signal detection, like PGAA or in-beam Mössbauer spectroscopy. Shielding possibilities close to the sample are limited, but guide shape has significant effect on the number of γ-photons produced in this region. To develop good γ-shielding and guide system we have to understand the source and transport of γ-radiation in neutron guides and surrounding shieldings. We have developed a program which integrate VITESS and MCNPX to calculate the γ-background. We compared the simulated γ-background and guide performance with measurements on real focusing guide configurations.
|Journal||Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|Issue number||1 SUPPL.|
|Publication status||Published - Apr 1 2011|
- Neutron guide
ASJC Scopus subject areas
- Nuclear and High Energy Physics