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Title: Effect of high gamma background on neutron sensitivity of fission detectors
Authors: Balagi, v
Prasad, K R
Kataria, S K
Keywords: Fission detectors;Neutron sensitivity;Neutron flux
Issue Date: Jun-2004
Publisher: NISCAIR-CSIR, India
IPC Code: G 21 J 5/00
Abstract: Tests were performed on two parallel plate and two cylindrical fission detectors in pulse and dc mode. The effect of gamma background on neutron sensitivity was studied in thermal neutron flux from 30nv to 60nv over which gamma field intensity ranging from 230kR/h to 3.7MR/h was superposed. In the case of one of the parallel plate detectors the fall in neutron sensitivity was observed to be 3.7% at 1 MR/h and negligible below 1 MR/h. In the case of one of the cylindrical counters the fall in neutron sensitivity was negligible below 500kR/h and 37% at 1 MR/h. The data was used to derive the design parameters for a wide range fission detector to be procured for PFBR instrumentation for operation at 600oC and gamma background of 1 MR/h.
Page(s): 390-397
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.42(06) [June 2004]

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