MEASUREMENT OF COSMIC-RAY-INDUCED NEUTRONS USING MULTI-SHELL BONNER SPHERES

Jungho Kim, Hyeonseo Park, Kil-Oung Choi

Abstract

Cosmic-ray-induced neutrons are important to estimate the environmental dose for the aircraft crews. New Bonner spheres were designed for high-energy neutrons up to 10 GeV and their response functions were evaluated using the MCNPX transport code. The spheres consisted of an inner polyethylene shell covering the ³He-filled spherical proportional counter, an outer polyethylene shell, and an inlet metal shell. Cosmic-ray-induced neutrons were measured at Korea Research Institute of Standards and Science together with the 10 existing Bonner spheres. Results of the neutron spectra showed that the response functions of the multi-shell Bonner spheres were calculated accurately.

Keywords

multi-shell Bonner sphere, MCNPX transport calculation, cosmic-ray-induced neutron

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IMEKO-WC-2012-TC19-O4.pdf

DOI

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IMEKO TC

TC19 - Environmental Measurements

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