McStas and Scatter Logger driven calculations of prompt gamma shielding for neutron guides

Abstract

McStas ScatterLogger component bundle was adapted for evaluating a contribution to dose rate around neutron guides arising from prompt gamma radiation accompanying neutron capture in the supermirror guide coating upon specular reflection. Thickness of typical shielding materials needed to reduce this contribution to the desired level can be now evaluated directly from running a ray-tracing simulation of the instrument in McStas. An overview of the corresponding modifications to the existing McStas components and description of the newly written supplementary ones is given together with examples and use instructions.

McStas (ii): An overview of components, their use, and advice for user contributions

“…• Shielding_logger: The shielding_logger components are a tool to estimate γ -production arising in and around neutron supermirror guides. The components correspond to a recently published model [11][12][13], and are implemented similarly to the so-called scatter-logger [10].…”

McStas (ii): An overview of components, their use, and advice for user contributions

“…• Shielding_logger: The shielding_logger components are a tool to estimate γ-production arising in and around neutron supermirror guides. The components correspond to a recently published model [19], [20], [21], and are implemented similarly to the so-called scatter-logger [22].…”