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Recent Developments Regarding a Time Measurement System Based on Isotopic Ratios

机译:基于同位素比的时间测量系统的最新发展

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A time-measurement system under development at Los Alamos National Laboratory is based on measurements of the ratio of gamma-ray peak intensities from two radioactive isotopes. This system can be applied in cases where the requirement for data protection precludes the use of self-contained power sources such as batteries. The time-measurement system operates by determining the change in the ratio of the 47- keV peak of ~210Pb to the 60-keV peak of ~241Am. These gamma-ray peaks are relatively close in energy and, hence, any changes in their efficiencies will be similar. Furthermore, they are low enough in energy that the detector can be easily shielded from interfering peaks generated by sources near the detector. Although an ideal time-measurement system would be based on the decay of a parent isotope with a short half-life decaying to a long half-life daughter, nature has not provided any acceptable mother/daughter pairs. The practical system utilizes two unrelated isotopes, ~210Pb and ~241Am, with half-lives of 22 y and 432 y respectively. We will present recent data and design developments, including an analysis algorithm intended to improve the robustness of this system, as well as results reflecting the sensitivity of the system to interfering sources of radiation.
机译:洛斯阿拉莫斯国家实验室正在开发的时间测量系统基于对两种放射性同位素的伽马射线峰值强度之比的测量。该系统可用于对数据保护的要求无法使用独立电源(例如电池)的情况。 时间测量系统通过确定〜210Pb的47-keV峰与〜241Am的60-keV峰之比的变化来工作。这些伽马射线峰的能量相对较近,因此,其效率的任何变化都将相似。此外,它们的能量足够低,因此可以轻松屏蔽检测器,使其免受检测器附近源产生的干扰峰的影响。 尽管理想的时间测量系统是基于母体同位素的衰变,其半衰期短而衰变到半衰期长,但自然界并没有提供任何可接受的母子对。实际系统利用两个无关的同位素〜210Pb和〜241Am,半衰期分别为22 y和432 y。 我们将介绍最新的数据和设计开发,包括旨在提高该系统的鲁棒性的分析算法,以及反映该系统对干扰辐射源的敏感性的结果。

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