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目的利用窄束X-γ射线打靶模型分析现场探伤时反散射射线剂量分布。方法通过康普顿散射模型和蒙特卡罗程序MCNP 4C模拟多种打靶条件下反散射剂量分布。结果反散射射线致剂量在接近±90°时数值最小,最大值出现在接近0°的某处,并随着射线能量的增加而趋于0°。结论在实际现场探伤中人员应在垂直射线入射方向上寻找最优化撤离隐蔽方案。
Objective To analyze the dose distribution of backscattered radiation during field flaw detection by using a narrow beam X-γ ray targeting model. Methods The anti-scatter dose distribution under various shooting conditions was simulated by the Compton scattering model and the Monte Carlo program MCNP 4C. Results The dose of backscattered radiation was the smallest at approximately ± 90 ° and the maximum appeared somewhere near 0 ° and tended to 0 ° as the beam energy increased. Conclusion In the actual field inspection, personnel should look for the optimal withdrawal concealment scheme in the direction of vertical ray incidence.