We developed a Gd₂Si₂O₇ (GPS) scintillator-based alpha imaging detector and demonstrated its effectiveness by evaluating the actual Pu particle and ²²²Rn progeny. The GPS scintillator plate was prepared by a sintering method. The outer dimensions of the GPS scintillator plate were $5\times 5$ cm, and the scintillator layer was approximately $50~\mu \text{m}$ on a 3-mm-thick high-transparency glass. The plate was optically coupled to a position-sensitive photomultiplier tube (Hamamatsu H8500, Hamamatsu, Japan) with silicone grease. The developed imaging detector exhibited good uniformity; Pu particle activities were accurately evaluated at 14 different positions and the difference in activity was within ±6%. The radon-222 progeny counts were reduced by 65.3% by applying an energy window. Although the Pu/²²²Rn progeny activity ratio was 1/51, the Pu particle was successfully identified among the ²²²Rn progeny within the 5-min measurement time. The imaging detector has an excellent ability for detecting Pu among the ²²²Rn progeny. Thus, this detector is useful for alpha contamination monitoring in high-radon-background environments.

中文翻译：

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开发基于 Gd2Si2O7 (GPS) 闪烁体的 α 成像探测器，用于在高氡环境中快速检测钚

我们开发了一种基于 Gd ₂ Si ₂ O ₇ (GPS) 闪烁体的 alpha 成像探测器，并通过评估实际的 Pu 粒子和²²² Rn 子代证明了其有效性。GPS闪烁体板通过烧结方法制备。GPS闪烁体板的外形尺寸为 $5\乘以5$ cm，闪烁体层约为 $50~\mu \text{m}$ 在 3 毫米厚的高透明玻璃上。该板与带有硅脂的位置敏感光电倍增管（Hamamatsu H8500，Hamamatsu，Japan）光学耦合。研制的成像探测器具有良好的均匀性；在14个不同位置准确评估Pu粒子活性，活性差异在±6%以内。通过应用能量窗口，氡 222 子代计数减少了 65.3%。虽然Pu/ ²²² Rn 子代活性比为1/51，但在5 分钟的测量时间内成功地在²²² Rn 子代中鉴定了Pu 颗粒。成像检测器在^{222 种}检测中具有极好的检测 Pu 能力Rn 后代。因此，该探测器可用于高氡背景环境中的 α 污染监测。