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在裂变径迹法筛选铀微粒的技术中,热中子辐照后如何实现微粒与径迹的对应以及微粒的转移是非常关键的步骤。采用激光烧蚀仪在介质膜与裂变径迹基片分离前刻蚀出标记,根据标记形状及微粒间的相对位置可实现微粒与径迹的对应关系,不需要介质膜与径迹片复位。采用微区溶解的方法,显微镜下手工挑出微粒并用热表面电离质谱仪对其同位素比值进行了分析。
In the technology of fission track screening of uranium particles, how to realize the correspondence between particles and tracks and the transfer of particles after thermal neutron irradiation is a very crucial step. A laser ablation meter is used to etch the marks before separating the dielectric film from the fission track substrate. The corresponding relationship between the tracks and tracks can be realized according to the shape of the marks and the relative positions of the particles. The dielectric film and the tracks are not required to be reset. Micropolyolysis was used to manually pick out the particles under a microscope and analyze their isotope ratios using a thermal surface ionization mass spectrometer.