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Abstract

The aim of the present work is to investigate the dependence of the response of spherical devices at much smaller centre-to-centre separation distances D(o) and to explain any departures from the inverse-square law. The response of spherical devices due to a physically small radionuclide source as a function of the separation distance, at both small and large distances, is well understood. Departures from the inverse square-law at close distances can be explained in terms of a geometric correction that takes into account the finite size of the detector and the divergence of the incident neutron fluence. If the response of a spherical device could be understood at such close distances, for a physically large source such as the D(2)O-moderated 252Cf source, then calibrations could be carried out over the full operational range of typical devices using neutron sources with relatively low emission rates. This would reduce the initial cost of the source to the calibration laboratory and ease the problems associated with its handling.

Additional information

Authors: KLUGE H, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);WEISE K, Physikalisch-Technische Bundesanstalt, Braunschweig (DE);HUNT J B, National Physical Laboratory, Teddington (GB)
Bibliographic Reference: Paper presented: Second Conference on Radiation Protection and Dosimetry, Orlando (US), Oct.31 - Nov.3, 1988
Availability: Available from (1) as Paper EN 34353 ORA
Record Number: 198910861 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en