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首页> 外文会议> >Study on a New Calibration Methods of in-situ HPGe γSpectrometers used for Non-destructive Analyzing Radioactivityin Nuclear Facilities Decommissioning
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Study on a New Calibration Methods of in-situ HPGe γSpectrometers used for Non-destructive Analyzing Radioactivityin Nuclear Facilities Decommissioning

机译：用于核设施退役放射性无损分析的原位HPGeγ谱仪新校准方法的研究

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Non-Destructive Analysis (NDA) is one of the important techniques to determine radio-nuclides andradio-activities in radiological characterization survey of nuclear facilities decommissioning. The development of in situgamma spectrometers, which is one kind of NDA device, over the last decade has transformed this technique once confined tolaboratories into a standard technique particularly suitable for building surfaces and soil measurements，and thencontamination object measurements. A number of in-situ HPGe spectrometers are available, some of which have beenspecifically designed for clearance measurements of buildings and sites, survey of radio- contamination term，using acollimator (thus restricting the area to be measured in order to allow quantitative measurements in Bq/cm2 or Bq/kg). Thesetypes of detectors require extensive calibration techniques. A new calibration technique of in-situ HPGeγspectrometers used fornon-destructive analyzing radioactivity in nuclear facilities decommissioning, is presented in this paper. At first, the“equivalent” geometrical sizes of the in-situ HPGe γ detector could be characterized by comparison of the detection efficiencyMC modeled and experimented using a series of γ radio-sources(Energy = 121keV ～ 1.408MeV)，and adjusting thegeometrical sizes of the in-situ HPGe γ detector. Second, the calibration factors of the in-situ HPGeγspectrometer，with which50mm lead shield and a collimator installed, are obtained by computation using MC modeling code -MCNP. After then, aseries of assay for some stainless steel pipes and tanks in some nuclear facilities/laboratories of CIAE are taken on site with thein-situ HPGeγspectrometer. At the same time, some examples are taken and analyzed in laboratories. The activity valuesobtained by in-situ HPGeγspectrometers on site are good agreement with that obtained by analyzing laboratories. The relativebias/variation between the values of activity measured by in-situ HPGeγspectrometers on site and that analyzed in laboratory isless than ±45.0%.
机译：无损分析（NDA）是确定放射性核素和放射性核素的重要技术之一 核设施退役放射学特征调查中的无线电活动。原位开发 伽马能谱仪是一种NDA装置，在过去的十年中，这种技术曾经仅限于 实验室转变为特别适合建筑表面和土壤测量的标准技术，然后 污染物体的测量。有许多原位HPGe光谱仪可供使用，其中一些已经 专为建筑物和场所的间隙测量，无线电污染术语的调查而设计，使用 准直仪（因此限制了要测量的面积，以允许以Bq / cm2或Bq / kg进行定量测量）。这些 类型的检测器需要广泛的校准技术。原位HPGeγ谱仪的一种新的标定技术。 本文介绍了核设施退役中放射性的非破坏性分析。首先， 原位HPGeγ探测器的“等效”几何尺寸可以通过比较探测效率来表征 MC使用一系列γ辐射源（能量= 121keV〜1.408MeV）进行建模和实验，并调整 原位HPGeγ探测器的几何尺寸。其次，原位HPGeγ光谱仪的校准因子， 使用MC建模代码-MCNP通过计算获得50mm的铅屏蔽层和一个准直仪。之后， 在CIAE的一些核设施/实验室中对不锈钢管和储罐进行的一系列测定与 原位HPGeγ光谱仪。同时，在实验室中采用了一些实例并进行了分析。活动值 通过现场HPGeγ谱仪现场获得的结果与通过实验室分析获得的结果吻合良好。相对的 通过现场HPGeγ光谱仪现场测量的活性值与实验室分析的活性值之间的偏差/变化为 小于±45.0％。

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