Development of the fast neutron standard using a Be({alpha},n) reaction at the National Metrology Institute of Japan |
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Authors: | Shimoyama T Harano H Matsumoto T Moriyama K Hata T Kudo K Koyamada T Uritani A |
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Affiliation: | National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan. tetu-shimoyama@aist.go.jp |
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Abstract: | This paper describes the 8-MeV neutron field where the neutrons are generated in the (9)Be(alpha,n)(12)C reaction by bombardment of a beryllium target with a 2.4-MeV (4)He(+) beam from a Van de Graaff accelerator. The neutron field is being prepared for a new national standard on neutron fluence in Japan. Absolute measurement of the neutron fluence was taken using a proton recoil neutron detector, consisting of a silicon surface barrier detector with a polyethylene radiator. Neutron spectra were measured using a newly developed recoil proton spectrometer and a liquid organic scintillation detector. The gamma rays existing in the field were also characterised using a liquid organic scintillation detector. The ambient dose equivalents of the gamma rays were estimated to be <100 microSv at the neutron fluence of 10(7) neutrons cm(-2). |
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