An Update on Radiochemical Separation Techniques for the Determination of Long-Lived Radionuclides via Accelerator Mass Spectrometry
An Update on Radiochemical Separation Techniques for the Determination of Long-Lived Radionuclides via Accelerator Mass Spectrometry
复制标题
通过加速器质谱法测定长寿命放射性核素的放射化学分离技术的更新
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
U. Herpers
中科院分区：
文献类型：
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作者：
Silke Merchel;U. Herpers
地外物质中的宇宙射线产生的长寿命放射性核素不仅保存了有关被照射物体本身的信息，例如陨石、月球或火星，但它们也给出了有关宇宙射线通量的光谱分布和恒定性的线索。由于所研究的材料稀缺且这些所谓的宇宙成因核素浓度较低，因此需要高度灵敏的分析技术。加速器质谱 (AMS) 满足此要求，但在 AMS 测量之前需要对样品进行放射化学分离。为此，我们针对通过 AMS 测量“Mn、Ni 和 Te”等较重核素的特殊要求改进了分离程序，特别注重干扰同量异位素的高度净化。
Long-lived radionuclides produced by cosmic rays in extraterrestrial matter not only preserve information about the irradiated objects themselves, e.g. meteorites, Moon or Mars, but they also give hints about the spectral distribution and constancy of the cosmic ray flux. Due to the scarcity of the investigated material and the low concentrations of those so-called cosmogenic nuclides, a highly sensitive analytical technique is needed. Accelerator mass spectrometry (AMS) meets this requirement, but radiochemical separation of samples prior to the AMS measurement is necessary. For that purpose we improved separation procedures with respect to the special demands on measurements of heavier nuclides like "Mn, Ni, and T e via AMS, especially focussing on high decontamination of interfering isobars.