Gamma-Ray Characterization of the Two-Year Irradiation Experiment Performed at the Poolside Facility.

摘要

Average gamma-ray group fluence rates are calculated for each of the three exposures in the two-year metallurgical blind test experiment at the ORR-Poolside Facility in Oak Ridge, thus completing the characterization of the radiation field for this experiment, which is intended to serve as an international metallurgical benchmark. Heating rates in the steel derived from these calculations varied from about 0.23 watts/gram in the simulated surveillance capsule to 1.4 milliwatts/gram at the three-quarters depth location in the simulated pressure vessel capsule, with secondaries arising from non-fission reactions in the core and ex-core steel contributing between seventy-seven and ninety-three percent of the total. Contributions from photofission to fission foil activities are estimated to be less than five percent of those previously calculated arising from neutron-induced fission.