Bragg探测器在AMS测量中的应用

Applications of Bragg Detector for AMS

摘要: 为提高Bragg探测器的总能量和Bragg峰的分辨等性能，对1台Bragg探测器进行改进，并利用其测量³⁶Cl、⁴¹Ca、⁷⁹Se系列标准样品，有效排除了相应同量异位素的干扰，为进一步提高AMS 测量这些中重核的灵敏度提供有效试验手段。

Abstract: A Bragg detector was modified systemically for higher sensitivity of accelerator mass spectroscopy (AMS) measurements for medium mass nuclides. The performance of the modified Bragg detector was improved. A series of ³⁶Cl, ⁴¹Ca and ⁷⁹Se standard samples were measured. The results show that this Bragg detector can be successfully used for identification of ³⁶Cl-³⁶S and ⁴¹Ca-⁴¹K. This Bragg detector has a higher charge identification capability than ΔE-E detectors. The nuclear charge identification power was tested and the results show that the Bragg detector can directly determine the value of nuclear charge number within uncertainty of 1.2%.