Neutron activation and prompt gamma intensity in Ar/CO${}_2$-filled neutron detectors at the European Spallation Source

Abstract

Monte Carlo simulations using MCNP6.1 were performed to study the effect of neutron activation in Ar/CO${}_2$ neutron detector counting gas. A general MCNP model was built and validated with simple analytical calculations. Simulations and calculations agree that only the ${}^{40}$Ar activation can have a considerable effect. It was shown that neither the prompt gamma intensity from the ${}^{40}$Ar neutron capture nor the produced ${}^{41}$Ar activity have an impact in terms of gamma dose rate around the detector and background level.

38 pages, LaTeX; formal changes: minor restructuring of Section 1 and 2; new references added, typos corrected; Figure 2 slightly modified for better visibility

References in corpus (4)

• Investigation of gamma-ray sensitivity of neutron detectors based on thin converter films
• Study of a high spatial resolution 10B-based thermal neutron detector for application in neutron reflectometry: the Multi-Blade prototype
• A design study of VOR: a versatile optimal resolution chopper spectrometer for the ESS
• Overcoming High Energy Backgrounds at Pulsed Spallation Sources