Abstract

We present studies of helium- and argon-filled ionization chambers exposed to intense neutron fluxes from PuBe neutron sources ( E n=1– 10 MeV) . The sources emit about 10 8 neutrons per second. The number of ion pairs in the chamber gas volume per incident neutron is derived. While limited in precision because of a large gamma ray background from the PuBe sources, our results are consistent with the expectation that the neutrons interact purely elastically in the chamber gas.

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