Development of an omnidirectional Compton camera with enhanced energy resolution for radioactive source localization

IF 1.8 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2026-02-01 Epub Date: 2025-12-03 DOI:10.1016/j.radmeas.2025.107583

Xinyu Yang , Jian Yang , Guoqiang Zeng , Haowen Deng , Chengshuai Tian , Chuanhao Hu

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引用次数: 0

Abstract

For radioactive source localization, traditional Compton cameras are limited by the imaging field-of-view (FOV) and low detection efficiency, resulting in slow response in complex environments. To address the limitations in the azimuthal sensitivity of conventional dual-layer scintillator detectors and the sensitive volume of semiconductor detectors, this study proposes an omnidirectional Compton camera based on four-sided scintillator detectors with a square ring-shaped structure. This imaging system features omnidirectional sensitivity with a continuous 360° azimuthal response, significantly enhancing detection efficiency by minimizing the escape of scattered photons. The smallest imaging unit utilizes an independent CsI(Tl) crystal coupled with a single SiPM, which reduces light propagation loss and improves light collection efficiency to enhance energy resolution. To simplify the electronic systems, a serial readout circuit is employed to reduce the readout channels. The experimental results demonstrate that the total energy resolution for the ¹³⁷Cs source was 6.2 % (FWHM) after calibrating the position and energy. Using the maximum likelihood expectation maximization algorithm for image reconstruction, the imaging system achieves accurate localization of radioactive sources with an angular resolution of 12° and clearly distinguishes the position of two radioactive sources.

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全向康普顿相机的研制，增强了辐射源定位的能量分辨率

对于放射源定位，传统康普顿相机受成像视场（FOV）和检测效率低等限制，在复杂环境下响应缓慢。针对传统双层闪烁体探测器方位灵敏度和半导体探测器灵敏体积的局限性，本研究提出了一种基于四边闪烁体探测器的方形环形结构全向康普顿相机。该成像系统具有全向灵敏度，具有连续的360°方位响应，通过最大限度地减少散射光子的逃逸，显著提高了探测效率。最小的成像单元利用独立的CsI（Tl）晶体与单个SiPM相结合，减少了光传播损失，提高了光收集效率，从而提高了能量分辨率。为了简化电子系统，采用串行读出电路来减少读出通道。实验结果表明，经位置和能量标定后，137Cs源的总能量分辨率为6.2% （FWHM）。成像系统采用最大似然期望最大化算法进行图像重建，实现了放射源的精确定位，角度分辨率达到12°，清晰区分了两个放射源的位置。

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来源期刊

Radiation Measurements 工程技术-核科学技术

CiteScore

4.10

自引率

20.00%

发文量

116

审稿时长

48 days

期刊介绍： The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal. Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.