^(90)Sr-^(90)Y源辐照样品片中β剂量的蒙特卡罗研究

Monte Carlo simulation of beta absorbed dose to slice samples irradiated by a ^(90)Sr-^(90)Y source

用蒙特卡罗程序EGSnrc/DOSRZnrc模拟计算石英、长石、氧化铝薄片样品在90Sr-90Yβ源照射下的吸收剂量,研究样品片中β剂量随深度的分布规律,讨论薄片样品的材料及厚度对吸收剂量的影响。结果表明,厚度在10–500μm之间的石英、长石或氧化铝样品片中,相对剂量的最大差异分别可达10%、8%和16%;但厚度在100–300μm之间的石英或长石样品片,或厚度在100–200μm之间的氧化铝样品片,相对剂量最大差异均不超过2%。

The EGSnrc/DOSRZnrc Monte Carlo program was used to calculate the absorbed dose to the quartz, the feldspar and the aluminum oxide slice samples irradiated by a ^90Sr-^90Yβ source. The distributions of the β absorbed dose with depth in the slice samples were evaluated, and the effects of the material and the thickness of the slice samples on the absorbed dose were discussed. Results show that for the quartz, the feldspar or the aluminum oxide slice samples with thickness ranging from 10 to 500 μ m, the maximum differences of the relative dose can be up to 10%, 8% and 16%, respectively. However, for the quartz or the feldspar slice samples with thickness between 100 and 300μm, and for the aluminum oxide slice samples with thickness between 100 and 200μm, the maximum differences of the relative dose are all less than 4%.