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方法的原理 r幅射的能谱鉴别测量原理是铀、镭,钍放射性测定方法的基础。这个原理是根据下述理由而被选用的:钍系元素具有能量为2.62兆电子伏的强γ谱,而对铀系元素来说,强γ谱的最大能量为1.8兆电子伏。由于铀系和钍系元素的γ幅射能量之间有一定差别,使之有可能从被测样品的混合γ幅射中区分出钍的γ幅射,并且可以根据两次γ测量的原理确定镭①和钍的含量,而根据总β幅射又可以确定铀的含量(哥利别克等,1955;雅库博维奇,1957)。
The principle of the method The principle of the energy spectrum discrimination measurement of radiation is the basis of the radioactive determination of uranium, radium and thorium. This principle is chosen for the following reasons: thorium elements have a strong gamma spectrum with an energy of 2.62 mega-volts, whereas for uranium elements the maximum energy of a strong gamma-ray is 1.8 mega-electron volts. Since there is a certain difference between the gamma radiation energies of uranium and thorium elements, it is possible to distinguish gamma radiation of thorium from the mixed gamma radiation of the sample under test and can be determined on the basis of two gamma measurements Radium ① and thorium content, and according to the total β radiation can determine the uranium content (Golibic et al., 1955; Yakubovich, 1957).