一种新型、快速响应的可再生生物聚合物中子和伽马辐射固体探测器,用于剂量测定和核反应堆通量功率测绘

Q3 Physics and Astronomy
Wen Jiang, True Miller, Troy Barlow, Nathan Boyle, Rusi P. Taleyarkhan
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引用次数: 0

摘要

提出了一种基于生物聚合物聚乳酸(PLA)的新型固态中子和伽马辐射监测剂量计。由此产生的探测器(PLAD)技术利用了可再生聚乳酸树脂在电离核辐射作用下的性能变化。成功开发了一种简单、快速、准确(±10%)、低成本(<$0.01/检测器)的溶解质量损失(MLD)技术;MLD是基于一个简单的质量平衡来识别中子和/或伽马剂量,使用小的(40毫克,~4毫米直径)超低成本(<$0.01)树脂珠通过丙酮溶解。采用GammaCellTM Co-60辐照器和PUR-1 12kw裂变核研究堆。辐射吸收剂量为1至100千戈瑞。丙酮浴温度为~40℃~ ~54℃。结果表明,中子和光子剂量组分之间的MLD对丙酮浴温度有很强的依赖性;这使得PLAD具有独特的功能,既可以作为中子和伽马,也可以作为伽马或中子辐射剂量计和强度水平检测器。当溶解在50℃以上进行时,发现中子和伽马联合辐射剂量在0 ~ 40 kGy范围内呈线性趋势。通过测定45°C的MLD,确定了区分中子和伽马辐射场的重要潜在能力,并发现这是可行的。在运行中的3gwt轻水反应堆(LWR)中,研究了同时用作堆芯内中子和伽马监测仪的电位。使用预辐照(@ 20°C) PLAD树脂珠进行范围测试,然后加热到堆芯内LWR冷却剂(300°C)条件下约30秒,对应于在典型的3 GWt LWR中达到约40 kGy总剂量的时间。MLD结果未受影响,表明在(低成本、准确和快速)现场同时测绘中子和伽马辐射通量、相关剂量学和裂变功率水平监测方面具有令人兴奋和独特的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Novel, Rapid Response Renewable Biopolymer Neutron and Gamma Radiation Solid-State Detector for Dosimetry and Nuclear Reactor Flux-Power Mapping
A novel solid-state neutron and gamma radiation monitor-dosimeter based on biopolymer polylactic acid (PLA) is presented. The resulting detector (PLAD) technology takes advantage of property changes of the renewable PLA resin when subject to ionizing nuclear radiation. A simple yet rapid and accurate (±10%) low-cost (<$0.01/detector) mass loss upon dissolution (MLD) technique was successfully developed; MLD is based on a simple mass balance for discerning neutron and/or gamma doses using small (40 mg, ~4 mm diameter) ultra-low-cost (<$0.01) resin beads via dissolution in acetone. The GammaCellTM Co-60 irradiator, and the PUR-1 12 kW fission nuclear research reactor were utilized, respectively. Irradiation absorbed doses ranged from 1 to 100 kGy. Acetone bath temperature was varied from ~40 °C to ~54 °C. Results revealed a strong dependence of MLD on acetone bath temperature between neutron and gamma photon dose components; this allowed for the unique ability of PLAD to potentially perform as both a neutron-cum-gamma or as a gamma or neutron radiation dosimeter and intensity level detector. A linear trend is found for combined neutron and gamma radiation doses from 0 to 40 kGy when dissolution is conducted above 50 °C. The important potential ability to distinguish neutron from gamma radiation fields was scoped and found to be feasible by determining MLD at 45 °C. The potential was studied for simultaneous use as an in-core neutron and gamma monitor of an operating 3 GWt light-water reactor (LWR). Scoping tests were conducted with the pre-irradiated (@ 20 °C) PLAD resin beads followed by heating to in-core LWR coolant (300 °C) conditions for ~30 s corresponding to the time to reach ~40 kGy total doses in a typical 3 GWt LWR. MLD results were unaffected, indicating the exciting and unique potential for in situ (low-cost, accurate and rapid) simultaneous mapping of neutron and gamma radiation fluxes, related dosimetry, and fission power level monitoring.
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来源期刊
Instruments
Instruments Physics and Astronomy-Instrumentation
CiteScore
2.60
自引率
0.00%
发文量
70
审稿时长
11 weeks
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