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引言一般认为,在用于反应堆中的核純鈾化合物中,慢中子俘获截面大的元素(如B,Cd,希土等),其相对含量不应超过10~(-6)—10~(-5)%,慢中子俘获截面較小的元素(如Fe,Al,Si,P等),其相对合量也不应超过10~(-4)—10~(-3)%。实践証明,发射光譜法是測定核純材料中微量杂质最有效的方法之一。在光譜法中,除了載体蒸餾法、化学光譜法已被成功地用来测定鈾化合物中的微量杂貭之外,1947年前后为苏联学者曼杰里什达姆等所創立的蒸发法也是目前应用最广泛的测定鈾化合物中微量杂貭的有效方法之一。
Introduction It is generally believed that the slow neutron capture of large elements (such as B, Cd, and so on) of the cross-section of nuclear pure uranium compounds used in reactors should not exceed 10 -6 -6 -10 -10 -1 (-5%). Slow neutron capture of smaller elements (such as Fe, Al, Si, P, etc.) should not exceed 10 -4% -10 -3%. Practice has proved that emission spectrometry is one of the most effective methods for the determination of trace impurities in pure nuclear materials. In spectroscopy, in addition to carrier distillation, chemical spectroscopy has been successfully used to determine trace impurities in uranium compounds. The evaporative method established by Soviet scholar Manjeritshim and others around 1947 is also present One of the most widely used methods for the determination of trace impurities in uranium compounds.