Development of micro-pocket fission detectors (MPFD) for near-core and in-core neutron flux monitoring

Martin F. Ohmes; Douglas S. McGregor; J. Kenneth Shultis; P. Michael Whaley; A.S.M. Sabbir Ahmed; Clayton C. Bolinger; Tracy C. Pinsent

doi:10.1117/12.513852

20 January 2004 Development of micro-pocket fission detectors (MPFD) for near-core and in-core neutron flux monitoring

Martin F. Ohmes, Douglas S. McGregor, J. Kenneth Shultis, P. Michael Whaley, A.S.M. Sabbir Ahmed, Clayton C. Bolinger, Tracy C. Pinsent

Author Affiliations +

Proceedings Volume 5198, Hard X-Ray and Gamma-Ray Detector Physics V; (2004) https://doi.org/10.1117/12.513852
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Miniaturized Micro-Pocket Fission Detectors (MPFD) are under investigation as real-time neutron flux monitors. The devices are capable of performing near-core and in-core reactor power measurements. The basic design utilizes neutron reactive material confined within a miniaturized gas pocket, similar to that of a fission chamber. Device size ranges from 500 microns to a few millimeters thick, thereby allowing them to be inserted directly between fuel elements of a reactor core. Fabricated from inexpensive ceramic materials, the detectors can be fashioned into a linear array to facilitate 3-D mapping of a reactor core neutron flux profile in "real-time". Initial tests have shown these devices to be extremely radiation hard and potentially capable of operating in a neutron fluence exceeding 10¹⁶ n cm^-2 without noticeable degradation.

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Martin F. Ohmes, Douglas S. McGregor, J. Kenneth Shultis, P. Michael Whaley, A.S.M. Sabbir Ahmed, Clayton C. Bolinger, and Tracy C. Pinsent "Development of micro-pocket fission detectors (MPFD) for near-core and in-core neutron flux monitoring", Proc. SPIE 5198, Hard X-Ray and Gamma-Ray Detector Physics V, (20 January 2004); https://doi.org/10.1117/12.513852

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