OSL剂量片剂量与荧光计数关系测量和分析

Measurement and analysis about the relationship between the dose of OSL and the counting of fluorescence

目的基于OSL原理,测量和分析在激发光下剂量片中沉积的剂量与激发出来的荧光光子数目的关系,为以后相关科研提供一个可靠的依据。方法使用一个1.48 GBq(40 mCi)-^(90)Sr/^(90)Yβ源对α-Al_2O_3:C剂量片进行不同时间的辐照,再用设计好的激发光装置将沉积在α-Al_2O_3:C剂量片的信号进行光激发,通过光电倍增管对荧光光子进行收集,最后通过单光子计数器输出计数。结果通过上面的实验方法得到了剂量片上沉积剂量与荧光光子数的关系,通过线性拟合后可以得到线性关系。结论从结果上可以看出剂量片上的本底剂量与其产生的荧光光子数存在线性关系,同时沉积剂量与荧光光子数也呈线性关系。

Objective Based on the principle of OSL,measure and analyze the relationship between the dose deposited in the element and the number of excited fluorescent photons in order to provide a reliable basis for future researchinstrument.Methods Use a 1. 48 GBq(40 mCi） of （90）Sr/（90）Y β source to irradiate the element of α-Al2O3： C at different times,then use the designed laser to stimulate the signals in the α-Al2O3： C,fluorescent photons are collected through a photomultiplier tube and finally counted by a single-photon counter. Results The relationship between the dose deposited in the element and the number of fluorescent photons is obtained by the experimental method above,and the results can be fitted in linear equation. Conclusion There is a linear relationship between the background dose on the element and the number of fluorescent photons,at the same time the dose deposited in the element and the number of fluorescence photons also shows a linear relationship.