硫酸镁热释光剂量响应的非线性研究

Nonlinearity of Dose Responses of Thermoluminescenece in Magnesium Sulphate

从室温至５００℃测得γ辐照的ＭｇＳＯ４样品的热释光发光曲线，通过计算机解谱，得到４个基本的发光峰．实验结果表明，４个发光峰均为超线性响应．前３个发光峰的超线性随峰温增加而增加，而第４发光峰的超线性反而有所减小．这与所观察到的ＬｉＦ（Ｍｇ，Ｔｉ）的剂量响应超线性规律有所不同．文章还讨论了ＭｇＳＯ４，ＬｉＦ（Ｍｇ，Ｔｉ）和ＬｉＦ（Ｍｇ，Ｃｕ，Ｐ）等热释光材料的的剂量响应的非线性相关的一些问题．

The thermoluminescence(TL) from anhydrous magnesium sulphate powder irradiated with γ ray in dose range from 1 Gy to 20 kGy were measured in pure nitrogen environment. TL glow curves were deconvoluted into four elementary peaks based on Gaussian function. The measured TL dose responses were fitted with a dose response function to get nonlinear characteristic parameters, one action factor and characteristic dose. It is shown in this experiments that the dose responses of peak height for 4 glow peaks are supralinear. The characteristics of dose responses in LiF(M,Ti), LiF(Mg,Cu,P) and MgSO 4 are discussed.