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This paper discusses the use of a commercially available 235U fission chamber, with a matching compensating ion chamber, originally sold as a single-ended detector with the signal conducted over the shield of a coaxial cable. The authors designed an aluminum housing that isolates the two detectors and converts the signals to full differential mode as a noise-reduction technique. The signals are processed using the switched resistor technique to extend the signal range to longer times from the peak of the pulse [Luker, S. M., Griffin, P. J., King, D. B., and Suo-Anttila, A. J., “Improved Diagnostics for Analysis of a Reactor Pulse Radiation Environment,” 13th International Symposium on Reactor Dosimetry, Akersloot, Netherlands, May 25, 2008, pp. 4–6.]. The newly configured fission chamber assembly has been used at the annular core research reactor at Sandia National Laboratories to provide a high-fidelity characterization of the neutron time profile from a pulsed operation.
Fission chamber, differential, common-mode rejection, CMRR, compensating, U-235, Photonis, CFUF53
Luker, S. M.
Senior Member Technical Staff, Applied Nuclear Technologies, Sandia National Laboratories, Albuquerque, NM
Griffin, P. J.
Principal Member Technical Staff, Nuclear Facility Operations, Sandia National Laboratories, Albuquerque, NM
Kolb, N. R.
Member Technical Staff, Applied Nuclear Technologies, Sandia National Laboratories, Albuquerque, NM
Naranjo, G. N.
Distinguished Technologist, Advanced Nuclear Concepts, Sandia National Laboratories, Albuquerque, NM
Suo-Anttila, A. J.
Computational Engineering Analysis LLC, Albuquerque, NM