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Improvements in Monitoring Enrichment of HEU Blend Down Under the U.S./Russian HEU Transparency Program

机译:根据美国/俄罗斯HEU透明度计划改进对HEU混合降质的监控

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The enrichment monitor designed to monitor HEU being blended down into LEU under the HEU Transparency Program at three Russian facilities was designed at Los Alamos National Laboratory in 1995. It was based on through-the-pipe gamma spectroscopy using a ~ 57Co (half-life 272 days) transmission source, a Bicron (St. Gobain) NaI(T1) detector, and an analog Canberra Inspector multichannel analyzer (MCA). This design was installed in the Urals Electrochemical Integrated Enterprise (UEIE) in 1999 and at the Electrochemical Plant (ECP) in 2003. The equipment has monitored much of the 320 metric tons that have been processed to date under the program since the HEU Purchase Agreement was signed in 1993. Over the years, the enrichment monitor has undergone significant improvement. In 2004 an improved system was installed in the Siberian Chemical Enterprise (SChE) using an ~241Am transmission source, the same type of NaI(Tl) detector, and an ORTEC digiDART MCA. The system featured a permanent transmission source due to the 433-year half-life of ~241Am, a digital MCA, and improved software. A similar ~57Co-based system was installed at UEIE in 2005. A ~57Co-based system is being planned to replace the current system at ECP.
机译:1995年,在洛斯阿拉莫斯国家实验室设计了一种浓缩监测器,该浓缩监测器是根据HEU透明度计划在三个俄罗斯设施中被混合到LEU中的,它是通过使用约57Co(半衰期)的管道伽马光谱学设计的。 272天)传输源,Bicron(圣戈班)NaI(T1)检测器和模拟堪培拉督察多通道分析仪(MCA)。该设计于1999年安装在乌拉尔电化学综合企业(UEIE)中,并于2003年安装在电化学工厂(ECP)中。自从HEU购买协议以来,该设备已监测了迄今为止根据该计划处理的320公吨中的大部分浓缩监测仪于1993年签署。多年来,该监测仪得到了显着改进。 2004年,使用〜241Am传输源,相同类型的NaI(Tl)检测器和ORTEC digiDART MCA在西伯利亚化学工业公司(SChE)中安装了改进的系统。由于具有〜​​241Am的433年半衰期,数字MCA和改进的软件,该系统具有永久的传输源。 2005年在UEIE上安装了类似的基于〜57Co的系统。正在计划使用基于〜57Co的系统来替换ECP上的当前系统。

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