加速器质谱测量93Zr的刻度研究

A method of determination for ⁹³Zr/⁹²Zr ratio by multi-collector inductively plasma mass spectrometry (MC-ICP-MS) was described in this paper. A ⁹³Zr/⁹²Zr ratio of (2.75±0.07)×10^－5 was obtained in the original sample for AMS measurement and its relative standard error was 2.5%. Considered the contribute of above-thermal neutron, a calculated ⁹³Zr/⁹²Zr ratio of 2.56×10^－5 was obtained and it was according with measurement of the result. The results showed that it can be used for AMS measurement standards sample preparation. A series 93Zr standards sample for AMS measurement were diluted by irradiated sample with enriched 92Zr.     

长寿命裂变产物126Sn活度和原子数的γ能谱法测定

By using HPGe γ-ray spectrometry, the activity of the long-lived fission product ¹²⁶Sn was measured. The number of ¹²⁶Sn atoms and the isotopic abundance of 126Sn/Sn were calculated based on the half-life value of 2.35×10⁵ a. The result of the isotopic abundance, (1.037±0.044)×10^－8, is consistent with the results measured by the accelerator mass spectrometry (AMS) within uncertainty limits, that confirms our procedures in the measurement of ¹²⁶Sn by AMS and lays a foundation for the AMS measurement of ¹²⁶Sn at much lower levels.