A low-background γγ -coincidence spectrometer for radioisotope studies
A low-background γγ -coincidence spectrometer for radioisotope studies
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用于放射性同位素研究的低本底γγ符合光谱仪
DOI：
10.1016/j.nima.2017.07.057
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Iliadis, Christian
中科院分区：
文献类型：
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作者：
Tillett, Andrew;Dermigny, John;Emamian, Mark;Tonin, Yuri;Bucay, Igal;Smith, Rachel L.;Darken, Michael;Dearing, Corey;Orbon, Mikaela;Iliadis, Christian
讨论了一种基于γγ符合计数的新型低本底NaI(Tl)光谱仪的性能。我们介绍了实验符合效率、时间分辨率、背景计数率和最小可检测活动。用Geant4对该光谱仪进行了模拟，计算结果用于估算体源的符合效率。为了测试该装置，我们测量了一小块(17.7克)陨石碎片中的宇宙成因26Al的活度。我们得到的值是52。9±7.8 DPM/kg，与之前使用HPGe探测器在同一陨石的大得多的碎片中测量的活度一致。
The performance of a new, low-background NaI (Tl) spectrometer, based on γ γ-coincidence counting, is discussed. We present experimental coincidence efficiencies, timing resolutions, background count rates, and minimum detectable activities. The spectrometer has been simulated using Geant4, and the results are used for estimating coincidence efficiencies for volume sources. To test the device, we measured the cosmogenic 26 Al activity in a small (17.7 g) meteorite fragment. We find a value of 52. 9±7. 8 dpm∕ kg, in agreement with the activity measured previously in a much larger fragment of the same meteorite using a HPGe detector.