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Report No.

A Helium-3 proportional counter technique for estimating fast and intermediate neutrons

Kosako, Toshiso*; Nakazawa, Masaharu*; Wakabayashi, Hiroaki*; Sekiguchi, Akira*

$$^{3}$$He proportional counter was employed to determine the fast and intermediateneutron spectra of wide energy region. The mixed gas ($$^{3}$$He, Kr) type counterresponse and the spectrum unfolding code were prepared and applied to some neutronfields. The counter response calculation was performed by using the Monte Carlocode,paying regards to dealing of the particle range calculation of the mixed gas.An experiment was carried out by using the van de Graaff accelerator to check theresponse function. The spectrum unfolding code was prepared so that it mayhave the function of automatic evaluation of the higher energy spectum's effectto the pulse hight distribution of the lower energy region. The neutron spectraof the various neutron fields were measured and compared with the calculations suchas the discrete ordinate Sn calculations. It became clear that the techniquedeveloped here can be applied to the practical use in the neutron energy rangefrom about 150 KeV to 5 MeV.



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