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铀不仅存在于天然的环境样品中,而且也存在于人体组织中。对于人体组织中低水平铀的测定,早期使用的荧光法和中子活化法均能测定纳克量的铀,但不能测定铀的单个同位素浓度。确定人体组织中同位素的相对含量对于研究人体中铀的来源是非常有用的。虽然曾见过一些有关测定沉积物、土壤和生物监测样品中同位素组成的报道,但对于软组织中铀同位素的测定尚无叙述。本文建立了一种简单的分析程序,它是基于溶剂萃取和固态α谱仪,选用三月桂胺作为萃取剂,制成20%三月桂胺(TLA)二甲苯溶液,使用前与10M盐
Uranium is not only found in natural environmental samples, but also in human tissues. For the determination of low levels of uranium in human tissues, both early use of fluorescence and neutron activation methods can determine nanograms of uranium, but can not determine the individual isotope concentrations of uranium. Determining the relative amounts of isotopes in human tissues is very useful for studying the sources of uranium in the human body. Although some reports have been made on the determination of isotopic compositions in sediment, soil and biological monitoring samples, the determination of uranium isotopes in soft tissues has not been described. In this paper, a simple analytical program was established based on solvent extraction and solid-state α-spectrometry with trilaurin as the extractant to make a 20% solution of trilaurin (TLA) in xylene. Before use,