NDLI: Experimental verification of the fission chamber gamma signal suppression by the Campbelling mode

Content Provider	IEEE Xplore Digital Library
Author	Vermeeren, L. Wéber, M. Oriol, L. Breaud, S. Filliatre, P. Geslot, B. Jammes, C. Normand, S. Lescop, B.
Copyright Year	2009
Description	Author affiliation: SCK·CEN, Boeretang 200, B-2400 Mol, Belgium (Vermeeren, L.; Wéber, M.) \|\| CEA/DRT/DETECS/SSTM (Saclay), F-91191 Gif sur Yvette Cedex, France (Normand, S.) \|\| INSTN, F-91191 Gif sur Yvette Cedex, France (Lescop, B.) \|\| CEA/DEN/SPEx/LDCI, Centre de Cadarache, F-13109 Saint-Paul-lez-Durance, France (Oriol, L.; Breaud, S.; Filliatre, P.; Geslot, B.; Jammes, C.)
Abstract	For the on-line monitoring of high fast neutron fluxes in the presence of a strong thermal neutron component, SCK·CEN and CEA are jointly developing a Fast Neutron Detector System, based on $^{242}Pu$ fission chambers as sensors and including dedicated electronics and data processing systems. Irradiation tests in the BR2 reactor of $^{242}Pu$ fission chambers operating in current mode showed that in typical MTR conditions the fission chamber currents are dominated by the gamma contribution. In order to reduce the gamma contribution to the signal, it was proposed to use the fission chambers in Campbelling mode. An irradiation experiment in the BR2 reactor with a $^{242}Pu$ and a $^{235}U$ fission chamber, both equipped with a suitable cable for measurements in Campbelling mode, proved the effectiveness of the suppression of the gamma-induced signal component by the Campbelling mode: gamma contribution reduction factors of 26 for the $^{235}U$ fission chamber and more than 80 for the $^{242}Pu$ fission chamber were obtained. The experimental data also prove that photofission contributions are negligibly small. Consequently, in typical MTR conditions the gamma contribution to the fission chamber Campbelling signal can be neglected.
Starting Page	1
Ending Page	8
File Size	496642
Page Count	8
File Format	PDF
ISBN	9781424452071
DOI	10.1109/ANIMMA.2009.5503801
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-07
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Materials testing Fission chambers Neutron detectors Neutrons Data processing Inductors Jamming Campbelling mode Fission reactor measurements Gamma rays Gamma ray detectors Fast neutrons Signal processing Gamma ray detection Signal design
Content Type	Text
Resource Type	Article

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