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Title: Use of nitrogen filled ion chamber for wide-range gamma monitoring
Authors: Balagi, V
Prasad, K R
Jakati, R K
Kataria, S K
Issue Date: Sep-2001
Publisher: NISCAIR-CSIR, India
Abstract: A gamma-sensitive ion chamber has been developed for area gamma monitoring. It has 800 cc sensitive volume filled with nitrogen at 120 psig pressure. With a current sensitivity of  0.6 nA/R/h the chamber needs 250 V for 90 % saturation at 10R/h. However, the use of the tanh formula proposed by Fallone and Podgorsak (Med-Phys, 10(1983) 191) has enabled the authors to develop an instrument to derive exposure rates as high as 80.000 R/h with the help of a single current reading at an applied voltage of 300 V. The instrument can be used to measure unknown exposure rate with accuracy within ±3.5%.
Page(s): 607-610
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.39(09) [September 2001]

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