同位素稀释-多接收电感耦合等离子体质谱测量裂变产物<sup>148</sup>Nd

同位素稀释-多接收电感耦合等离子体质谱测量裂变产物¹⁴⁸Nd

摘要: 采用多接收电感耦合等离子体质谱（MC-ICPMS）, 用同位素稀释法测量了反应堆辐照后核燃料中的裂变产物¹⁴⁸Nd。通过2个标准物质对仪器的稳定性进行检验，得到仪器的2个校正系数K值相差十万分之一。以高纯天然钕为基准稀释剂，用同位素稀释质谱标定浓缩^144Nd试剂的质量分数，然后以它作为稀释剂，测量裂变产物¹⁴⁸Nd的同位素丰度和质量分数。结果表明，¹⁴⁸Nd丰度为0.088 7±0.001 2，¹⁴⁸Nd质量分数为(4.65±004) ng/g。

Abstract: The isotopic abundance and mass fraction of the fission product ¹⁴⁸Nd in the irradiated nuclear fuel were measured with ID-MC-ICPMS. The stability of mass spectrometry instrument was tested using two kinds of standard materials and the difference of two correction factors was less than 0.001%. The mass fraction of enriched isotope ¹⁴⁴Nd was determined by using the high pure natural neodymium as the spike. Then the mass fraction of ¹⁴⁸Nd in the irradiated nuclear fuel was determined by the certified enriched ¹⁴⁴Nd as the spike. The isotopic abundance and mass fraction of ¹⁴⁸Nd in the fission products is 0.088 7±0.001 2 and (4.65±004) ng/g respectively.