Abstract

Background radiations typical for the high‐sensitivity underground experiments in particle astrophysics are discussed. An emphasis is given to the neutron background coming from spontaneous fission and (α,n) reactions from U and Th traces in rock and detector components, and from cosmic‐ray muons. Gammas from radioactivity in various materials are also considered. Special case of a xenon‐based large‐scale dark matter detector is studied. Several Monte Carlo codes capable of producing, transporting and detecting neutrons are compared with each other and with available experimental data.

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