摘要:
In some study fields, when the enriched uranium producted form different erichment technology have the absolute same level of composition 235U, it is to be measured and compared by mass spectrometry whether there was a difference abundances of uranium isotope composition 234U. But it is hardly possible to obtain the required pairs of samples with the absolute same level of 235U abundance. If the comparison is done by means of determining a series of abundance values of the two products and fitting the curves respectively, error of the result will be enormous. In order to overcome this problem, a precise measurement method or mathematic model of the difference was deduced. The deduction of the method makes use of principle of the isotope ration to ration measurement α in mass spectrometry and the relations of 234U to 235U in the enrichment technology theory. By means of this model, through the measured α of two pairs of samples with different 235U abundance from enriched products produced by the different technology, the relative difference value at a certain level of 235U can be exactly obtained. Theoretical error of the method approximately is equal to the error of only a single α measurement, which mainly depends on the level of the instrument precision and the abundance ranges of the pairs of samples. A less than 1% of total uncertainty (relatively) was given in the practical experiments in the plant.
Abstract:
In some study fields, when the enriched uranium producted form different erichment technology have the absolute same level of composition 235U, it is to be measured and compared by mass spectrometry whether there was a difference abundances of uranium isotope composition 234U. But it is hardly possible to obtain the required pairs of samples with the absolute same level of 235U abundance. If the comparison is done by means of determining a series of abundance values of the two products and fitting the curves respectively, error of the result will be enormous. In order to overcome this problem, a precise measurement method or mathematic model of the difference was deduced. The deduction of the method makes use of principle of the isotope ration to ration measurement α in mass spectrometry and the relations of 234U to 235U in the enrichment technology theory. By means of this model, through the measured α of two pairs of samples with different 235U abundance from enriched products produced by the different technology, the relative difference value at a certain level of 235U can be exactly obtained. Theoretical error of the method approximately is equal to the error of only a single α measurement, which mainly depends on the level of the instrument precision and the abundance ranges of the pairs of samples. A less than 1% of total uncertainty (relatively) was given in the practical experiments in the plant.
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