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Candidates for leadership provide statements: ANS Board of Directors
With the annual ANS election right around the corner, American Nuclear Society members will be going to the polls to vote for a vice president/president-elect, treasurer, and members-at-large for the Board of Directors. In January, Nuclear News published statements from candidates for vice president/president-elect and treasurer. This month, we are featuring statements from each nominee for the Board of Directors.
D. P. Roux, A. R. Buhl
Nuclear Technology | Volume 12 | Number 1 | September 1971 | Pages 137-140
Technical Note | Reactor | doi.org/10.13182/NT71-A15906
Articles are hosted by Taylor and Francis Online.
As a result of the effect of residual gamma radiation on neutron detectors in shutdown reactors, the precision of subcriticality measurements by noise analysis is degraded. An equation for this gamma degradation effect was developed for application to fast reactors. The gamma degradation factor D and the detection efficiency Wn were evaluated for 10B, 3He, and 235U detectors for application in the Fast Flux Test Facility (FFTF), and it was concluded that the 235U, the least sensitive of the three detectors, is the best choice. The 235U detector is 40 times less efficient than the 3He detector, but it should experience only a slight degradation in the FFTF. By contrast, degradation factors varying between 100 and a few thousand are anticipated for the 3He detector through the shutdotvn range of -1 to -10 dollars. Furthermore, D is unity up to 106 R/h and is independent of p for the fission chamber when used as a counter.
