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目的对X射线穿过混凝土的宽束透射进行参数拟合,减小由查透射曲线图而带来的误差。方法依据国际辐射防护委员会33号报告中给出的X射线穿过混凝土的宽束透射数据,以Archer建立的X射线宽束透射数学模型采用SPSS 21.0进行拟合。结果 200、250、300、400 kV X射线穿过混凝土的宽束透射参数拟合相关系数平方R~2均达到0.999,与国际辐射防护委员会33号报告中厚度值相比最大偏差小于2 mm混凝土。结论在屏蔽设计时根据屏蔽透射因子和拟合的参数计算混凝土屏蔽厚体,可得到合适的防护厚度。
Objective To perform parameter fitting of wide-beam transmission of X-ray through concrete, and to reduce the error caused by the investigation of transmission curve. Methods According to the broad beam transmission data of X-ray passing through concrete given in International Commission on Radiological Protection Report No. 33, the X-ray broad beam transmission mathematical model established by Archer was fitted with SPSS 21.0. Results The squared correlation coefficient R ~ 2 of wide beam transmission parameters of 200, 250, 300 and 400 kV X-ray beams passing through concrete reached 0.999, which was less than 2 mm compared with the reported value of the International Commission on Radiological Protection 33 . Conclusion Calculating the thickness of concrete shield according to the shield transmission factor and fitting parameters during the shield design can obtain a suitable shield thickness.