不同能量X和γ射线剂量等效性影响因素的蒙特卡罗方法研究  

Influencing factors of dose equivalence for X and γ rays with different energy based on Monte Carlo

作　　者：过惠平[1] 吕汶辉 吕宁[1] 魏志浩[1] 

机构地区：[1]第二炮兵工程大学,西安710025

出　　处：《核技术》2014年第1期24-28,共5页Nuclear Techniques

摘　　要：X、γ射线的广泛应用使得剂量仪器测量的准确性亟待解决,采用X射线机代替标准γ源对剂量仪器进行标校时需要了解其等效性影响因素。为研究低能X射线与天然放射源等效过程中的修正项,采用蒙特卡罗(Monte Carlo,MCNP)软件对低能X射线与高能X、γ射线等效性的影响因素进行了模拟,得出了距离、空间散射、探测器响应对剂量等效的不同影响,最后对模拟结果进行了分析。该结论可用于低能X射线与高能X、γ射线源之间的等效修正,对于X射线的广泛应用具有重要意义。Background： The accuracy of dosimeter measurement of X and γ rays needs to be resolved. Purpose： The aim is to study the correction term of the equivalent process of low-energy X-ray and the natural radioactive source. Methods： Instead of the standard sources, X-ray machine was adopted on the dose instrument calibration. The influence factors of the equivalence between low-energy X-ray and high-energy X or y rays were simulated using Monte Carlo （MCNP） software. Results： The influences of distance, space scattering, response of detector on dose equivalence were obtained. The simulation results were also analyzed. Conclusion： The method can be used in dose equivalent correction for low-energy X-ray, high-energy X or 7 rays, which is significant for the widespread use of X rays.

关 键 词：蒙特卡罗(Monte Carlo MCNP) 等效 比释动能率 影响因素 X、γ射线 

分 类 号：TL77[核科学技术—辐射防护及环境保护]