摘要: The specific production of tritium in samples of exp 6 LiH and exp 7 LiH embedded in a 600-mm-diam sphere of exp 6 LiD irradiated by a central source of 14-MeV neutrons was determined by measuring the activity of the hydrogen evol... 展开 The specific production of tritium in samples of exp 6 LiH and exp 7 LiH embedded in a 600-mm-diam sphere of exp 6 LiD irradiated by a central source of 14-MeV neutrons was determined by measuring the activity of the hydrogen evolved from the samples of each isotope at each of five different radii in the exp 6 LiD assembly. The entire process of decomposing the LiH, transferring the evolved gas into counters, and determining the decay rate was standardized by processing LiH samples irradiated by thermal neutrons for which the exp 6 Li(n, alpha ) cross section is well known. The specific production of tritium in exp 6 LiH and exp 7 LiH (embedded samples) and the activation of radiochemical detector foils of exp 45 Sc, exp 89 Y, exp 90 Zr, exp 169 Tm, exp 191 Ir sub 373 , exp 193 Ir sub 627 , exp 197 Au, exp 235 U, and exp 238 U placed at various positions in the exp 6 LiD sphere were calculated and compared with the experimental data. One- and three-dimensional Monte Carlo and S/sub n/ neutron-transport calculations were performed. The most reliable (three-dimensional Monte Carlo) calculation is in reasonable agreement with both the tritium-production and the radiochemical-activation data. The existing discrepancies between calculation and experiment appear largely attributable to uncertainties in some tritium-production and radiochemical-activation cross sections. 15 references. (ERA citation 04:028371) 收起