Abstract In this study, an airborne alpha detection system, which consists of a passivated implanted planar silicon (PIPS) detector and an air filter, was developed. A collimator applied to the alpha detection system showed an enhancement in resolution and a degradation in detection efficiency. The resolution and detection efficiency were compared and analyzed to evaluate the performance of the collimator. Thus, the resolution was found to be more important than the efficiency as a determining factor of the detection system performance, from the viewpoint of radionuclide identification. The performance was evaluated on three properties of the collimator: hole shape, hole length, and the ratio between the hole and frame pitches. From the hole shape performance evaluation, a hexagonal collimator showed the highest resolution. Further, the collimator with a hole pitch of 14 mm was found to have the highest resolution while that with a frame pitch of 4–6 mm (i.e., 1.2–1.4 times longer than the hole pitch) showed the highest resolution.

中文翻译：

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通过 MCNP 模拟对带有准直器的机载 Alpha 探测系统进行光谱分辨率评估

摘要 本研究开发了一种由钝化植入平面硅（PIPS）探测器和空气过滤器组成的机载α探测系统。应用于 alpha 检测系统的准直器显示出分辨率的提高和检测效率的下降。对分辨率和检测效率进行了比较和分析，以评估准直器的性能。因此，从放射性核素识别的角度来看，作为检测系统性能的决定因素，分辨率比效率更重要。性能根据准直器的三个特性进行评估：孔形状、孔长度以及孔与框架间距之间的比率。从孔形状性能评估来看，六边形准直器显示出最高分辨率。更多，