基于MCNP和能谱法对γ射线吸收实验的改进
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摘要
针对一般的测量物质线性吸收系数实验的缺点,文章利用Monte Carlo N Particle Transport Code(MCNP)和全能峰面积法模拟计算了不同实验条件下物质γ射线吸收的线性吸收系数,计算与公认值的偏差.通过使偏差在较小的合理范围内,并与其它方法对比,找出了合适的实验条件,使测量装置易于调试,可得射线能量信息,而且比计数法的准确度高,探测效率较高,以此改进并简化了实验.
In view of the defect of the traditional measurements of materials linear absorption coefficients, in this work the linear absorption coefficients of gamma ray in different experimental conditions are simulated and calculated using the Monte Carlo N Particle Transport Code(MCNP) and the method of full energy peak area, and the deviations of the coefficients from the recognized values are also calculated. The appropriate experimental condition is obtained by reducing the deviation to a reasonable scope and contrasting with other methods. As a result, the approved measuring equipment which is easy to adjust is able to obtain the information about radiation energy. It offers a better accuracy and higher detection efficiency compared with the counting method.
In view of the defect of the traditional measurements of materials linear absorption coefficients, in this work the linear absorption coefficients of gamma ray in different experimental conditions are simulated and calculated using the Monte Carlo N Particle Transport Code(MCNP) and the method of full energy peak area, and the deviations of the coefficients from the recognized values are also calculated. The appropriate experimental condition is obtained by reducing the deviation to a reasonable scope and contrasting with other methods. As a result, the approved measuring equipment which is easy to adjust is able to obtain the information about radiation energy. It offers a better accuracy and higher detection efficiency compared with the counting method.
引文
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[2] El-Khayatt A M. Semi-empirical determination of gamma-ray kerma coefficients for materials of shielding and dosimetry from mass attenuation coefficients [J]. Prog Nucl Energy, 2017, 98: 277.
[3] Roy B R, Rao A S N. Measurement of X-ray absorption coefficient of NiCO3 around K-edge of Ni using synchrotron radiation [J]. Mater Today, 2016, 3: 3861.
[4] 复旦大学, 清华大学, 北京大学. 原子核物理实验方法 [M]. 北京: 原子能出版社, 1997.
[5] Choppin G, Liljenzin J, Rydberg J, et al. Radiochemistry and nuclear chemistry [M]. 4th ed. Salt Lake Ctiy: Acadamic Press, 2013: 182.
[6] 陈英琦, 陈玲燕, 张哲, 等. 用γ射线能谱法测量材料的吸收系数和厚度 [J]. 同位素, 2004, 17: 21.
[7] Singh V P, Medhat M E, Badiger N M. Photon energy absorption coefficients for nuclear track detectors using Geant4 Monte Carlo simulation [J]. Radiat Phys Chem, 2015, 106: 83.
[8] 周剑良, 吕洋, 程晓龙, 等. 基于MCNP程序和γ射线能谱法对未知材料线吸收系数的测定 [J]. 科学技术与工程, 2013, 13: 6580.
[9] 马玉刚, 周银行, 赵广义, 等. NaI(Tl)探测γ能谱的MCNP模拟 [J]. 吉林大学学报, 2007, 45: 451.
[10] 唐碧华. 射线探测效率及响应函数的蒙特卡罗方法研究 [D]. 成都: 四川大学, 2006: 49.
[11] 邵达, 韩纪峰, 杨朝文. 单能电子半吸收厚度测量中射线吸收强度计算方法研究 [J]. 四川大学学报: 自然科学版, 2013, 50: 557.
[12] 范杰, 吴丽萍, 赵艳群, 等. 用EGSnrc程序包对单能电子实验过程影响因素的研究 [J]. 四川大学学报: 自然科学版, 2009, 46: 1417.
[13] 马崇智. 放射性同位素手册[M]. 北京: 科学出版社, 1979: 451.