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The quadrupole type mass spectrometer system for the precise determination of 235U isotope ratio of UF6 has been developed. Fundamental performances, such as inlet and evacuation characteristics, resolution, relative sensitivity, pattern coefficients, isotopeion current detection characteristics were measured and examined carefully on this quadrupole type mass spectrometer for UF6. The operational stability of this quadrupole type maas spectrometer was good. 235U and 238U isotope peak was resolved perfectly. Secondary electron multiplier tube was effective for rapid measuring low ion current with high efficiency, but it had about 3% systematic error on determination of 235U isotope ratio. It was able to correct this error easily by calibration with standard sample. Results of the performance tests were good. 235U isotope ratio measurements were carried out by use of many UF6 standard samples. The precision and the accuracy of the measurements were less than ±0.3% under appropriate operating conditions attained. The time required for measuring one sample was less than five minutes.

Development of Quadrupole Type Mass Spectrometer for Analysis of UF6