Abstract
The deviation in reading due to inverse square law is an important issue in the calibration of neutron detection systems. The geometry correction factor of a neutron-measuring device is a unique property of this type of device, and may depend on the dimensions, shape of the source and the detector, the distance between them and the neutron source spectrum. This study deals with the geometric analysis of angular distribution for landing neutrons from a non-point source on a Bonner sphere spectrometer (BSS) and solid angles subtended by detectors from distributed source. Using mathematical relations, an analytical function was introduced to calculate the geometry correction factor and the effectiveness parameter. By comparing the analytical and Monte Carlo values of geometry factors, it was found that the effectiveness parameter (δ′) for BSS depends on the source radius, the BSS radius and the energy of the source (energy itself depends on the distance). The effectiveness parameter in this case was δ′≡δ′[RD,RS,E(l′)].
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