Determination of isotopic ratios of uranium by a thermoionizing method

A thermoionizing method was applied to the determination of isotopic ratios of uranium. It is confirmed that the double-collector method (compensation method) is more accurate and more practical than the single-collector method.The accuracy of the former is ±0.2%, while that of the latter is ±0.6%. The fol lowing experimental conclusions are also obtained. (1) Both uranyl nitrate {UO2(NO3)2} and uranyl chloride (UO2Cl2) can be used as uranium sample for the determination, although it is desirable to use the same salt in a series of experiments. (2) The current of ionization filament and vaporization filament must be held constant in a series of experiments. (3) The same ionization case must be used to compare the isotopic ratios of uranium. (4) The time required for a measurement is about 6090 minutes.