2012•Nuclear TechniquesRequires access
Simulation of detection efficiency for a ~3He proportional counter and its sensitivity calibration
Yingdu Liu
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Abstract
In this article,relationship between the thickness of a tube 3He proportional counter and its detection efficiency are studied by Monte Carlo simulation of monoenergetic neutron and Hess spectrum neutrons.A 5-cm thickness of the polyethylene modulator is thus determined.Finally,utilizing a 252Cf neutron source and the natural neutron background,the detector sensitivity is calibrated.