Esaka Fumitaka, Yasuda Kenichiro, Suzuki Daisuke, Miyamoto Yutaka, Magara Masaaki
Research Group for Safeguards Analytical Chemistry, Japan Atomic Energy Agency (JAEA), 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan.
Research Group for Safeguards Analytical Chemistry, Japan Atomic Energy Agency (JAEA), 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan.
Talanta. 2017 Apr 1;165:122-127. doi: 10.1016/j.talanta.2016.12.041. Epub 2016 Dec 21.
Isotope ratio analysis of individual uranium-plutonium (U-Pu) mixed oxide particles contained within environmental samples taken from nuclear facilities is proving to be increasingly important in the field of nuclear safeguards. However, isobaric interferences, such as U with Pu and Am with Pu, make it difficult to determine plutonium isotope ratios in mass spectrometric measurements. In the present study, the isotope ratios of Pu/Pu, Pu/Pu, Pu/Pu, and Pu/Pu were measured for individual Pu and U-Pu mixed oxide particles by a combination of alpha spectrometry and inductively coupled plasma mass spectrometry (ICP-MS). As a consequence, we were able to determine the Pu/Pu, Pu/Pu, and Pu/Pu isotope ratios with ICP-MS after particle dissolution and chemical separation of plutonium with UTEVA resins. Furthermore, Pu/Pu isotope ratios were able to be calculated by using both the Pu/(Pu+Pu) activity ratios that had been measured through alpha spectrometry and the Pu/Pu isotope ratios determined through ICP-MS. Therefore, the combined use of alpha spectrometry and ICP-MS is useful in determining plutonium isotope ratios, including Pu/Pu, in individual U-Pu mixed oxide particles.
对从核设施采集的环境样品中所含单个铀钚（U-Pu）混合氧化物颗粒进行同位素比值分析，在核保障领域正变得越来越重要。然而，诸如U与Pu以及Am与Pu之间的同量异位素干扰，使得在质谱测量中难以确定钚同位素比值。在本研究中，通过α能谱法和电感耦合等离子体质谱法（ICP-MS）相结合，对单个Pu和U-Pu混合氧化物颗粒的Pu/Pu、Pu/Pu、Pu/Pu和Pu/Pu同位素比值进行了测量。结果，在颗粒溶解并用UTEVA树脂对钚进行化学分离后，我们能够用ICP-MS测定Pu/Pu、Pu/Pu和Pu/Pu同位素比值。此外，通过使用通过α能谱法测量的Pu/(Pu+Pu)活度比值以及通过ICP-MS测定的Pu/Pu同位素比值，能够计算出Pu/Pu同位素比值。因此，α能谱法和ICP-MS的联合使用对于确定单个U-Pu混合氧化物颗粒中的钚同位素比值（包括Pu/Pu）很有用。
