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首页> 外文会议>INMM annual meeting >Performance of a Small Portal Using Integrated Germanium Detector Modules
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Performance of a Small Portal Using Integrated Germanium Detector Modules

机译：使用集成锗探测器模块的小型门户的性能

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Portal monitors and mobile search systems are most effective in positive identification when constructed with high resolution detectors. To satisfy the need for this type of detector, an integrated gamma ray spectrometer, incorporating a germanium detector with integral mechanical cooling, digital signal processing electronics, MCA, and communications has been developed. This modular subsystem has been used in a several different applications, including use in stationary and mobile systems for the detection and identification of radioactive materials. To have the sensitivity needed for these applications the detectors must have good low and medium energy detection efficiency coupled with excellent spectral peak resolution. The high resolution is needed to remove peak overlaps and overcome the problems of masking of SNM with common nuclides. In either situation where the spectrometer and the source are moving relative to one another, the Field of View (FOV) determines the time the radioactive material contributes to the data in the spectrum. The absolute efficiency and background (i.e., signal-to-noise ratio) determine the minimum detectable or identifiable quantity for the material in the FOV. The uniformity of the performance of several units over the energy range of 80 keV to 1.8 MeV was previously reported. A portal monitor was constructed with 8 detectors and the performance measured for several common test nuclides. The total height of the detection zone is 2 meters with 4 detectors uniformly spaced on each side. In this portal, the horizontal FOV is limited by steel collimators. The vertical FOV was not collimated. The background was measured in low background and elevated (NORM) background situations. The measurements presented show this unit can be applied to a wide variety of monitoring situations for the detection of illicit material.
机译：当使用高分辨率探测器构建时，门户网站监控器和移动搜索系统在阳性识别方面最有效。为了满足对这种类型的探测器的需求，已经开发出集成的伽马射线光谱仪，该探测器结合了具有整体机械冷却功能的锗探测器，数字信号处理电子设备，MCA和通信。该模块化子系统已用于多种不同的应用中，包括在固定和移动系统中用于检测和识别放射性物质。为了具有这些应用所需的灵敏度，检测器必须具有良好的中低能量检测效率以及出色的光谱峰分辨率。需要高分辨率来消除峰重叠并克服使用普通核素掩盖SNM的问题。在光谱仪和放射源相对移动的两种情况下，视场（FOV）都会确定放射性物质对光谱数据的贡献时间。绝对效率和背景（即信噪比）决定了FOV中物料的最小可检测量或可识别量。先前曾报道过，在80 keV至1.8 MeV的能量范围内，几个单元的性能均一。用8个检测器构建了一个门户监测器，并测量了几种常见测试核素的性能。检测区域的总高度为2米，每侧均匀分布4个检测器。在此门户中，水平FOV受钢准直仪限制。垂直视场未准直。在低背景和高（NORM）背景情况下测量背景。所提供的测量结果表明，该装置可应用于各种监测情况，以检测非法物质。

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