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, Larry A. Franks, Arnold Burger, Ralph B. James, Paul L. Hink
<span title="2004-01-20">2004</span> <i title="SPIE"> Hard X-Ray and Gamma-Ray Detector Physics V </i> &nbsp;
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
more &raquo; ... nexpensive 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 10 16 n . cm -2 without noticeable degradation.
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