...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Feasibility study of activity measurement of positron emitters based on gamma-gamma coincident detection by two NaI(Tl) detectors
【24h】

Feasibility study of activity measurement of positron emitters based on gamma-gamma coincident detection by two NaI(Tl) detectors

机译：基于两个NaI（Tl）探测器进行γ-γ重合检测的正电子发射体活度测量的可行性研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Detection of two and more γ-rays in coincidence by two NaI(Tl) detectors with almost 4π geometry allows absolute characterization of radionuclides emitting coincidence gammas.The method is a generalization of the Eldridge-Crowther method developed originally for x-rays and low energy γ-rays. This method is applied to the case of 94Nb decay with two coincident gamma-rays emitted in one cascade.The application of this method for the case of coincident positron-gamma emission ( 22Na and 26Al sources) meets some difficulties. In these decays, two 511keV gamma quanta produced in positron annihilation are strongly correlated. Despite the fact that the third gamma emitted in 22Na and 26Al decays is not correlated with two annihilation quanta, the number of independent observables for 22Na and 26Al decays is less than the number of unknowns. The small parameter ω 00, the probability that both annihilation quanta escape detection in both NaI(Tl) detectors, cannot be determined. However, if this parameter is defined from experimental data for one source with known activity ( 22Na), the activity of the other source ( 26Al) can be calculated from experimental data for 26Al decay.
机译：通过两个具有几乎4π几何形状的NaI（Tl）探测器同时探测到两个或更多的γ射线，可以绝对表征发射一致伽玛射线的放射性核素。 γ射线。该方法适用于94Nb衰减且两个重合伽玛射线以一个级联方式发射的情况。该方法用于正电子-γ重合发射（22Na和26Al源）遇到一些困难。在这些衰变中，在正电子ni灭中产生的两个511keVγ量子高度相关。尽管在22Na和26A1衰变中发射的第三伽玛与两个an没量子量无关，但22Na和26A1衰变的独立可观测数少于未知数。无法确定小的参数ω00，即两个NaI（Tl）检测器中两个both灭量子逃逸检测的概率。但是，如果从具有已知活度（22Na）的一个源的实验数据中定义此参数，则可以从26Al衰减的实验数据中计算另一源（26A1）的活度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号