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为测定天然样品中的钍含量,已完成了改进径迹技术的试验。对于钍含量的测量,采用了能量为18和20MeV的γ射线。对能量范围为6～23.5MeV的γ射线,已获得了对于厚靶的铀、钍元素的裂变碎片径迹密度比N_u/N_(Th)比值为1.7～3.2,其中与最大值对应的γ射线能量为15MeV。在实验误差范围内,标定的Th标准样和铁锰结核测定的钍含量与已知值是一致的。对9.1MeV/n的α粒子,已发现径迹密度比N_(Th)/N_u=1.06±0.07,但钍含量偏低,这可能是由于α粒子束的垂向不均匀性以及云母中径迹由热造成的局部缺陷所致。该研究在核反应实验室JINR完成。
In order to determine the thorium content in natural samples, tests have been completed to improve the track technique. For the measurement of thorium content, gamma rays with energies of 18 and 20 MeV were used. For γ-rays with an energy range of 6-23.5 MeV, the ratio of the track-to-surface ratio of uranium and thorium fission fragments to N_u / N_ (Th) of 1.7 to 3.2 for thick targets has been obtained, of which γ-rays corresponding to the maximum The energy is 15MeV. Within the experimental error range, the thorium contents of the calibrated Th standards and ferromanganese nodules are consistent with the known values. For the 9.1MeV / n α particles, it has been found that the track density ratio N_ (Th) /N_u=1.06 ± 0.07, but the content of thorium is low, which may be due to the vertical inhomogeneity of α particle beam and the track of mica Local defects caused by heat. The study was completed at the Nuclear Reaction Laboratory JINR.