可作为校准检定用标准剂量计的能量补偿型高气压电离室改进

辐射防护 ›› 2017, Vol. 37 ›› Issue (2): 87-93.

可作为校准检定用标准剂量计的能量补偿型高气压电离室改进

高飞, 肖雪夫, 倪宁, 侯金兵, 宋明哲

中国原子能科学研究院计量与校准技术重点实验室,北京 102413

收稿日期:2016-03-25 出版日期:2017-03-20 发布日期:2021-11-11
作者简介:高飞(1983—),男,2013年7月博士毕业于中国原子能科学研究院辐射防护及环境保护专业,副研究员。E-mail:83jerry@163.com

Development of energy compensated high pressure ionization chamber as standard dosimeter for metrological verification

Gao Fei, Xiao Xuefu, Ni Ning, Hou Jinbing, Song Mingzhe

National Key Laboratory for Metrology and Calibration Techniques, China Institue of Atomic Energy, Beijing 102413

Received:2016-03-25 Online:2017-03-20 Published:2021-11-11

摘要/Abstract

摘要： 在电离辐射计量检定工作中,标准剂量计的测量结果通过检定逐级传递到工作计量器具,以实现单位统一和量值准确可靠。由于环境水平γ射线剂量率较低,国际上常用的PTW-UNIDOS系列标准剂量计无法满足需要。针对这一特点,结合蒙特卡罗方法对高气压电离室的X射线、γ射线和宇宙射线响应特性进行模拟计算,进行了能量补偿型高气压电离室改进。测试结果表明:剂量率约30 μGy/h时,能量补偿型高气压电离室在87 keV～1.25 MeV能量范围内相对于¹³⁷Cs γ射线的响应偏差不大于6%,宇宙射线和¹³⁷Cs γ射线的响应偏差不大于10%,在0.5 μGy/h～1 mGy/h范围内相对固有误差为-3%,0.5 μGy/h时的重复性为0.7%,校准因子的不确定度为4%(k=2),可作为环境水平标准剂量计在校准检定工作中使用。

关键词: 标准剂量计, 高气压电离室, 蒙特卡罗

Abstract: In the ionizing radiation metrology work, the measurement results of the standard dosimeters are transferred to working metrological instruments through verification in order to achieve a unified unit and accurate and reliable quantity value. Due to low environmental gamma ray dose rate, the common PTW-UNIDOS series standard dosimeter can not meet the requirements for verification. An energy compensated high pressure ionization chamber was developed for this feature. The response characteristics of high pressure ionization chamber for X ray, gamma ray and cosmic ray were simulated using Monte Carlo method. Test results showed that the response deviation within the energy range of 87 keV—1.25 MeV for the ¹³⁷Cs gamma ray was less than 6% when the dose rate was about 30 μGy/h, the deviation in cosmic rays and ¹³⁷Cs gamma ray response was less than 10%, relative intrinsic error was -3% in the dose rate range of 0.5 μGy/h—1 mGy/h, the repeatability was 0.7% when the dose rate was 0.5 μGy/h, and the uncertainty of the calibration factor was 4% (k=2). The energy compensated high pressure ionization chamber can be used as a standard dosimeter in calibration and verification at environmental levels.

Key words: standard dosimeter, high pressure ionization chamber, Monte Carlo

中图分类号:

TL72

高飞, 肖雪夫, 倪宁, 侯金兵, 宋明哲. 可作为校准检定用标准剂量计的能量补偿型高气压电离室改进[J]. 辐射防护, 2017, 37(2): 87-93.

Gao Fei, Xiao Xuefu, Ni Ning, Hou Jinbing, Song Mingzhe. Development of energy compensated high pressure ionization chamber as standard dosimeter for metrological verification[J]. RADIATION PROTECTION, 2017, 37(2): 87-93.

参考文献

[1] 岳清宇,金花,江有玲. 高压电离室环境辐射剂量率仪[J]. 辐射防护,1986, 6(1):29-33.
[2] IAEA. Generic procedures for monitoring in a nuclear or radiological emergency [R]. IAEA-TEC-DOC-1092.1999.
[3] Winkelmann, Becker DE, Ruhle H. Monitoring of radioactive discharges from nuclear power plants [J]. Kerntechnik, 1993, 58(4).
[4] 岳清宇, 金花. 低大气层中宇宙射线电离量的分布测量[J]. 辐射防护, 1988, 8(6):401-409.
[5] 金花, 岳清宇, 王文海. 核设施环境γ辐射连续监测系统[J]. 原子能科学技术, 1997, 31 (3):204-209.
[6] Neumaier S,Funck E,Sáez-Vergara C.The PTB Contribution on The 1999 EURADOS Intercomparison of National Early Warning Systems[J]. Radiation Protection Dosimetry, 2000,92(1-3):101-108.
[7] Thompson IMG,Andersen CE,Bφtter-Jensen L.An International Intercomparison of National Network Systems Used to Provide Early Warning of A Nuclear Accident Having Transboundary Implications[J].Radiation Protection Dosimetry,2000,92(1-3):89-100.
[8] Health and safety laboratory.High Pressure Argon Ionization Chamber Systems for the Measurement of Environmental Radiation Exposure Rates[R]. Newyork:HASL260,1972.
[9] 高飞,肖雪夫,倪宁. 固定式环境γ辐射剂量率仪现场校准技术[J]. 原子能科学技术,2015, 49(3):212-217.
[10] 全国电离辐射计量技术委员会. JJG 2044—2010 γ射线空气比释动能计量器具[S]. 北京:国家质量监督检验检疫总局, 2011.
[11] 全国电离辐射计量技术委员会. JJG521—2006 环境监测用X、γ辐射空气比释动能(吸收剂量)率仪[S].北京:国家质量监督检验检疫总局, 2006.
[12] 王红艳,肖雪夫. 用蒙特卡罗方法模拟计算高气压电离室对⁶⁰Co和¹³⁷Cs源的空气吸收剂量率因子[J]. 原子能科学技术,2006,40(5):632-634.
[13] 高飞,肖雪夫,倪宁,等. 高气压电离室能量响应特性的蒙卡方法优化设计[J]. 核电子学与探测技术,2014,(6):788-793.
[14] Beck HL. Monte Carlo calculations of electromagnetic shower transition effects [J]. Nuclear Instruments and Methods, 1971, 91:525-531.
[15] Rokni SH, Nelson WR. The electromagnetic cascade shower [R]. Stanfotd Linear Accelerator Center, 2001.
[16] 于水,王功鹏,关首任. 低大气层宇宙射线剂量水平及机组人员受照剂量的研究[J]. 辐射防护,1997,17(2):103-108.
[17] Peter KF, Grieder. Cosmic rays at earth [M]. NewYork:Elsevier, 2001.
[18] 任天山,林莲卿,陈志鹏. 宇宙射线电离量的测定和几种探测器对宇宙射线的响应[J]. 辐射防护,1987,7(3):185-190.
[19] IOS. X and gamma reference radiations for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy—Part1: radiation characteristics and production method[R]. Geneva Suitzerland: ISO Publication Office, 4037-1, 1997.