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目的验证MCNP程序计算γ射线的空气比释动能率及周围剂量当量率的准确性。方法将空气比释动能率的理论计算值与模拟值进行对比,以及将周围剂量当量率的实际测量值与模拟值进行对比。结果比释动能率的理论值与模拟值吻合良好,而周围剂量当量率的测量值与模拟值最大误差不超过7.9%,两者呈现与距离平方成反比趋势,随距离增大两者之间的误差变小。结论 MCNP程序可准确模拟空气比释动能率和周围剂量当量率,可应用于制定放疗计划和机房防护等工作中。
Objective To verify the accuracy of the MCNP program for calculating the air kerma rate of γ-rays and the dose equivalence ratio of the surrounding areas. The method compares the theoretical calculated value of air kerma rate with the simulated value, and compares the actual measurement value of the equivalent dose of ambient dose with the simulated value. Results The theoretical and kinetic energy of kerma fitted well with the simulated values. However, the maximum error between the measured value and the simulated value of the surrounding dose equivalent did not exceed 7.9%. Both of them showed an inverse trend with the square of the distance. The error becomes smaller. Conclusion MCNP program can accurately simulate the air kerma rate and the surrounding dose equivalent rate, which can be used in the development of radiotherapy planning and room protection work.