60Co放射源单层排列的剂量分布

Dose Distribution of Single Layer Arrangement of 60Co Radioactive Sources

[目的]了解60 Co放射源单层排列的剂量场空间剂量分布。[方法]使用低量程重铬酸银剂量计对辐射场的水平方向和垂直方向进行布点测量和分析,对不同堆码高度换层后辐照场吸收剂量进行计算。[结果]辐照场水平方向上,离开护源板的距离与剂量间的关系符合y=A e-0.01 x的变化趋势,x与y的相关系数为-0.9354^-0.9115;垂直方向上离开源棒中点的距离与剂量间的关系符合y=a+bx变化趋势,x与y的相关系数达到-0.9733。垂直方向上不同高度换层后最高剂量、最低剂量和平均剂量均随着高度的增加而降低。[结论]该研究为产品辐照工艺的制定、产品辐照质量控制、放射源能量的合理利用提供了依据。

[Objective]To understand the spatial dose distribution of dose field of single layer arrangement of 60 Co radioactive sources.[Method]The horizontal and vertical distribution of the radiation field was measured and analyzed by using a low-range silver dichromate dosimeter.The absorbed dose of radiation field after changing layers at different stacking heights was calculated.[Result]The relationship between the distance from the source plate and the dose was in accordance with the changing trend of y=A e-0.01 x in the horizontal direction of the radiation field.The correlation coefficient between x and y was from-0.9354 to-0.9115.The relationship between the distance from the midpoint of the source rod and the dose in the vertical direction was in accordance with the changing trend of y=a+bx,and the correlation coefficient between x and y was-0.9733.After changing layers at different heights in vertical direction,the highest dose,the lowest dose and the average dose decreased with the increase of height.[Conclusion]This study provided the basis for the formulation of product irradiation technology,product irradiation quality control and rational utilization of radioactive source energy.