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苏联利用动力堆中子活化分析岩石和矿石中的金及其伴生元素含量。被辐照的样品置于电离室备用孔道。该孔道位于活化区外石墨反射层,直径50mm,此处最大热中子流密度为10~9cm~(-2)·s~(-1),温度80—90°C。样品能在这里长时间(几昼夜)被辐照。利用中子活化分析方法测定金基于放射性俘获的~(197)Au (n,γ)~(193)Au (T1/2=65h)反应和记录的41~2KeVγ辐射能。样品破碎到200目,其含金范围为2×(10~(-5)—10~(-3))％。为定量测量利用标准样P3C-1和P3C-2,其含金量分别为5.21×10~(-3)和9.4×10~(-5)％。被辐照的样品放入聚乙烯安瓿中(直径和高分别为40和20mm),样品质量为15—20g。不仅用全谱中子流还要用镉上中子进行辐照(在后一种情况下安瓿被厚度为O.5mm的镉屏围绕。)。辐照时间与金含量多
The Soviet Union used dynamic reactor neutron activation analysis of rock and ore gold and its associated elements. The irradiated sample is placed in the ionization chamber spare tunnel. The channel is located in the graphite reflective layer outside the activation zone, the diameter of 50mm, where the maximum thermal neutron flux density of 10 ~ 9cm ~ (-2) · s -1, the temperature of 80-90 ° C. The sample can be irradiated here for a long time (several days and nights). The neutron activation analysis method was used to determine the radiant energy of 41 ~ 2 KeV based on the reaction and recording of ~ (197) Au (n, γ) ~ 193 Au (T1 / 2 = 65h) The sample was crushed to 200 mesh with a gold content of 2 × (10 ~ (-5) -10 ~ (-3))%. For the quantitative measurement, the standard samples P3C-1 and P3C-2 were used, and their gold contents were 5.21 × 10 -3 and 9.4 × 10 -5%, respectively. The irradiated samples were placed in polyethylene ampoules (40 and 20 mm in diameter and height, respectively) with a sample mass of 15-20 g. Not only the full-spectrum neutron flux but also the neutron irradiation with cadmium (in the latter case the ampoule is surrounded by a cadmium shield with a thickness of 0.5 mm). Irradiation time and gold content