Variation in k0 neutron flux parameters after replacement of the beryllium reflector and graphite wedge at the University of Missouri Research Reactor
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In January 2006 the beryllium reflector and graphite wedge that contained the k0 INAA irradiation position were replaced at the University of Missouri Research Reactor. Prior to replacement the average values of the flux ratio, f, and the epithermal non-ideality factor, α, were 57.4 ± 4.5 and 0.039 ± 0.012. The values of f and α immediately after the beryllium and graphite wedge replacement were 39.4 ± 0.6 and 0.021 ± 0.002. Subsequent measurements indicate that the neutron spectrum hardened with time, possibly due to the buildup of the 6Li atom density to saturation.
KeywordsNeutron activation analysis k0 NAA Beryllium reflector
- 6.Andrzejewski KJ, Kulikowska TA (2004) Nucl Technol 146:72Google Scholar