石英β剂量的蒙特卡罗模拟

Monte Carlo simulation of absorbed dose in quartz from beta rays

用蒙特卡罗方法对TL或OSL测定年代中用β源进行照射时石英样品的吸收剂量进行模拟,研究石英薄片样品厚度和石英单颗粒大小对吸收剂量的影响。模拟程序用EGSnrc/DOSRZnrc,圆柱形薄片样品直径0.97cm,厚度10–500μm,单颗粒大小60–300μm。结果表明,吸收剂量与薄片样品的厚度有关,相对剂量的最大差异达10%;石英单颗粒中相对剂量随颗粒变小而增大,最大差异达19%。这些因素在测定年代过程中需加以考虑。

The absorbed dose in quartz samples irradiated by β rays in TL or OSL dating protocol was simulated using the EGSnrc/DOSRZnrc code. Effects of thickness and grain size of the quartz samples on the absorbed dose were evaluated with the samples of 00.97 crux（10-500） μm, in grain size of 60-300 μm. The results show that the absorbed dose in quartz is relative to the sample thickness, and the maximum difference of the relative dose can be up to 10%. The absorbed dose is relative to the grain size, too. The relative dose increases with decreasing grain size, and the maximum difference can be up to 19%. These factors should be considered in the dating.