High-performance oxygen terminated synthetic single crystal diamond detector for high gamma dose rate measurement

IF 1.6 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2024-07-23 DOI:10.1016/j.radmeas.2024.107256

Libin Wang , Yiyun Zhang , Xuecheng Wei , Shanxue Xi , Guangwei Huang , Haijun Li , Zhihai Ma , Yushou Song , Chunzhi Zhou , Xiaoyan Yi , Junxi Wang , Huilan Liu , Jinmin Li

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引用次数: 0

Abstract

A high-performance oxygen terminated synthetic single crystal diamond (SCD) detector (4.5 × 4.5 × 0.5 mm³) is presented. The SCD detector exhibits an extremely low leakage current value of 0.29 pA/mm² with an electric field of 0.3 V/μm. The charge collection spectrum measured with a²³⁸Pu source (5.48 MeV α-particles) irradiation shows that the electron and hole charge collection efficiency (CCE) reach as high as 99.1% and 98.9%, with an energy resolution as low as 2.87% and 2.53%, respectively, compared to Si detector. The SCD detector shows excellent radiation hardness and stability under ⁶⁰Co γ-ray irradiation with a dose rate of 12.737 kGy/h at 150 V bias and is able to withstand a cumulative dose of up to at least 9.3 kGy. The detector output in current mode is linearly related to the dynamic dose rate (0.409 Gy/h-12.737 kGy/h). Similarly, the counting rate of the detector in counting mode exhibits a strong linear variation within the range of 2.6 mGy/h-1269.36 Gy/h. Our results fully indicate that our fabricated SCD detector can be potentially applied to harsh γ irradiation scenarios, which is of guiding significance on real-time dose monitoring.

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用于高伽马剂量率测量的高性能氧端合成单晶金刚石探测器

本文介绍了一种高性能氧端合成单晶金刚石（SCD）探测器（4.5×4.5×0.5 毫米）。在 0.3 V/m 的电场条件下，SCD 探测器的漏电流值极低，仅为 0.29 A/mm。在钚源（5.48MeV α粒子）辐照下测量的电荷收集谱显示，与硅探测器相比，电子和空穴电荷收集效率（CCE）分别高达 99.1%和 98.9%，能量分辨率分别低至 2.87%和 2.53%。在 150 V 偏置下，SCD 探测器在 12.737 kGy/h 剂量率的 Co γ 射线辐照下表现出优异的辐射硬度和稳定性，并能承受至少 9.3 kGy 的累积剂量。电流模式下的探测器输出与动态剂量率（0.409 Gy/h-12.737 kGy/h）呈线性关系。同样，在计数模式下，探测器的计数率在 2.6 mGy/h-1269.36 Gy/h 范围内呈现出强烈的线性变化。我们的研究结果充分表明，我们制造的 SCD 探测器可以应用于严酷的γ辐照场景，这对实时剂量监测具有指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.