Abstract
If the calibration is carried out in close proximity to the source, the device readings must be corrected for non-uniform illumination. The geometric correction factor for the calibration of spherical devices with either a bare 252 Cf source of very small dimensions or with the large spherical D 2 O-moderated 252 Cf source, has been developed. Measurements made with devices of different diameters have been evaluated and the computed parameters obtained using the generalised model, a polynomial fit model, a semi-empirical model and the shadow cone techniques, intercompared. The influence of the scattering effects was investigated in two differently sized rooms. Combined geometric and scatter correction functions as a function of the distance between the centre of the neutron source and the detector are presented.
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