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Title: Boron-lined neutron detectors with gamma discrimination for reactor applications
Authors: Prasad, K R
Dighe, P M
Alex, Mary
Issue Date: Feb-2000
Publisher: NISCAIR-CSIR, India
Abstract: Neutron sensitive detectors capable of discriminating against gamma background have been indigenously developed for reactor applications. A boron-10 lined proportional counter with 3.5 cps/nv counting sensitivity and a boron-10 lined gamma compensated neutron ion chamber with a current sensitivity of 11 fA/nv have been developed for the reactor start up and intermediate range instrumentation, respectively. The detectors have all welded high-purity aluminium construction and integral mineral-insulated cable assembly. Explosion-welded SS-aluminium clad material has been used as interface between the aluminium body of the detector and the ceramic-metal in sulators. The counter has gas filling of argon and carbon dioxide at 20 cm Hg. It has 190 mg of enriched boron-10 coating and can be used over a neutron flux range of 0.1 nv to 105 nv. The gamma compensated ion chamber has hydrogen filling at 10 psi pressure. Performance tests in typical neutron and gamma fields show that the chambers can tolerate gamma background up to 1000 r/h and over 100°C of ambient temperature.
Page(s): 21-24
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.07(1) [February 2000]

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