In the framework of the IAEA Coordinated Research Project (CRP) J02012 on ‘Advancing Radiation Detection Equipment for Detecting Nuclear and Other Radioactive Material Out of Regulatory Control’, the properties of two commercial instruments (1) InSpector 1000 analyzer (Canberra), with a 2″ × 2″ NaI(Tl) scintillator and (2) RIIDEYE M-G3 analyzer (Thermo Scientific), with a 3″ × 3″ NaI(Tl) scintillator, were evaluated as dosimeters by laboratory and field measurements. In the Ionizing Radiation Calibration Laboratory (IRCL) of the Greek Atomic Energy Commission, the NaI(Tl) spectrometers were tested in order to measure Ambient gamma Dose Equivalent Rate (ADER). The NaI(Tl) scintillators were irradiated in a homogeneous field with 662 keV photons with different ADER values from 0.17 to 100 μSv h−1 at 0° incidence (irradiation field perpendicular to the detector’s front window) and at 90° incidence. For each irradiation, the measured ADER by the spectrometers and the ‘true’ ADER values (provided by the IRCL) were compared. In addition, the angular dependence (0–359°) of the ADER response of the spectrometers was studied with a 152Eu source placed at 1, 2 and 3 m from the spectrometers. The ADER dependence as function of the distance from the 152Eu source (at 0° incidence) measured by the two detectors was compared with the theoretical one. In the field studies, ADER was measured by the spectrometers at seven locations belonging to the Greek Early Warning System Network (which is based on Reuter-Stokes ionization chambers). These locations have different ADER values ranging from 20 to 120 nSv h−1. In these locations, gamma ADER were also deduced (1) by in situ gamma spectrometry measurements with portable Germanium HPGe detectors and (2) by the Reuter-Stokes ionization chambers (by subtraction of the cosmic radiation). Gamma dose measurements were also performed with the InSpector 1000 and RIIDEYE M-G3 detectors in 25 locations (beaches) of Northern Greece and compared with the ADER values deduced by sand sample analysis with gamma spectroscopy. Beaches with sand are good candidates for such type of measurements since they are commonly flat and in principle the natural radionuclides are homogenously distributed.

中文翻译：

---

通过实验室和现场剂量率测量得出的手持式 NAI(TL) 光谱仪作为剂量计的性能

在 IAEA 协调研究项目 (CRP) J02012“推进用于检测不受监管的核材料和其他放射性物质的辐射检测设备”的框架内，两种商业仪器的特性 (1) InSpector 1000 分析仪（堪培拉），具有2″ × 2″ NaI(Tl) 闪烁体和 (2) RIIDEYE M-G3 分析仪 (Thermo Scientific)，以及 3″ × 3″ NaI(Tl) 闪烁体，通过实验室和现场测量评估为剂量计。在希腊原子能委员会的电离辐射校准实验室 (IRCL) 中，对 NaI(Tl) 光谱仪进行了测试，以测量环境伽马剂量当量率 (ADER)。NaI(Tl) 闪烁体在均匀场中用 662 keV 的光子照射，不同的 ADER 值从 0 开始。17 到 100 μSv h-1 在 0° 入射（辐射场垂直于探测器前窗）和 90° 入射。对于每次照射，将光谱仪测量的 ADER 和“真实”ADER 值（由 IRCL 提供）进行比较。此外，在距离光谱仪 1、2 和 3 m 处放置 152Eu 源，研究了光谱仪 ADER 响应的角度依赖性（0-359°）。将由两个探测器测量的作为距 152Eu 源（0°入射角）的距离函数的 ADER 依赖性与理论值进行了比较。在实地研究中，光谱仪在属于希腊早期预警系统网络（基于 Reuter-Stokes 电离室）的七个地点测量了 ADER。这些位置具有不同的 ADER 值，范围从 20 到 120 nSv h-1。在这些地方，伽马 ADER 还通过 (1) 使用便携式锗 HPGe 探测器进行原位伽马光谱测量和 (2) 通过 Reuter-Stokes 电离室（通过减去宇宙辐射）推导出来。还在希腊北部的 25 个地点（海滩）使用 InSpector 1000 和 RIIDEYE M-G3 探测器进行伽马剂量测量，并与通过伽马光谱分析沙样分析推导出的 ADER 值进行比较。有沙子的海滩是此类测量的良好候选者，因为它们通常是平坦的，并且原则上天然放射性核素是均匀分布的。还在希腊北部的 25 个地点（海滩）使用 InSpector 1000 和 RIIDEYE M-G3 探测器进行伽马剂量测量，并与通过伽马光谱分析沙样分析推导出的 ADER 值进行比较。有沙子的海滩是此类测量的良好候选者，因为它们通常是平坦的，并且原则上天然放射性核素是均匀分布的。还在希腊北部的 25 个地点（海滩）使用 InSpector 1000 和 RIIDEYE M-G3 探测器进行伽马剂量测量，并与通过伽马光谱分析沙样分析推导出的 ADER 值进行比较。有沙子的海滩是此类测量的良好候选者，因为它们通常是平坦的，并且原则上天然放射性核素是均匀分布的。