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Title: Neutron sensitivity improvement in boron-lined proportional counters
Authors: Dighe, P M
Prasad, K R
Kataria, S K
Issue Date: Apr-2002
Publisher: NISCAIR-CSIR, India
Abstract: Various techniques have been employed to improve the neutron sensitivity of boron-coated proportional counters developed indigenously. A boron-lined proportional counter (67 mm ID x 750 mm length ) of 17 cps/nv thermal neutron sensitivity is developed by coating 92% enriched 10B on the inner wall of the counter. This counter can be used for low thermal neutron flux (~0.2 nv) at various applications such as neutron area monitoring, reactor start -up instrumentation, assay of fissile materials and detection of fuel failure. An improvement in sensitivity was also achieved by summing the output signals from four 10B lined counters and two BF3, proportional counters. The summation did not change the susceptibility of the device to gamma interference. In view of the scarcity of enriched 10B isotope, indigenously avail able natural boron coated two prototype proportional counters are developed of 0.8 cps/nv and 1.1 cps/nv thermal neutron sensitivity. Efforts have been made to improve the sensitivity with boron coated 3-dimensional structures introduced into the sensitive volume. Tests in thermal neutron flux showed 50% improvement in the sensitivity due to the introduction of additional boron coated wires. Another counter with 51 boron-coated annular discs (23 mm OD x 10 mm ID x 1mm thick) mounted perpendicular to the axis of the cathode showed 1.7 cps/nv neutron sensitivity, an improvement by a factor of 2.5.
Page(s): 91-97
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.09(2) [April 2002]

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