Horowitz Y S, Horowitz A, Oster L, Marino S, Datz H, Margaliot M
Physics Department, Ben Gurion University of the Negev, Beersheva, Israel.
Radiat Prot Dosimetry. 2008;131(4):406-13. doi: 10.1093/rpd/ncn197. Epub 2008 Jul 29.
The dependence of the shape of the glow curve of LiF:Mg,Ti (TLD-100) on ionisation density was investigated using irradiation with (90)Sr/(90)Y beta rays, 60 and 250 kVp X rays, various heavy-charged particles and 0.2 and 14 MeV neutrons. Special attention is focused on the properties of high-temperature thermoluminescence; specifically, the behaviour of the high-temperature ratio (HTR) of Peaks 7 and 8 as a function of batch and annealing protocol. The correlation of Peaks 7 and 8 with average linear-energy-transfer (LET) is also investigated. The HTR of Peak 7 is found to be independent of LET for values of LET approximately >30 keV microm(-1). The behaviour of the HTR of Peak 8 with LET is observed to be erratic, which suggests that applications using the HTR should separate the contributions of Peaks 7 and 8 using computerised glow curve deconvolution. The behaviour of the HTR following neutron irradiation is complex and not fully understood. The shape of composite Peak 5 is observed to be broader following high ionisation alpha particle irradiation, suggesting that the combined use of the HTR and the shape of Peak 5 could lead to improved ionisation density discrimination for particles of high LET.
利用（90）Sr/（90）Yβ射线、60和250 kVp X射线、各种重带电粒子以及0.2和14 MeV中子进行辐照，研究了LiF:Mg,Ti（TLD - 100）热释光曲线形状对电离密度的依赖性。特别关注高温热释光的特性；具体而言，峰7和峰8的高温比（HTR）随批次和退火方案的变化情况。还研究了峰7和峰8与平均线能量转移（LET）的相关性。发现对于LET值约>30 keV·μm⁻¹的情况，峰7的HTR与LET无关。观察到峰8的HTR随LET的变化不稳定，这表明使用HTR的应用应通过计算机化热释光曲线解卷积来分离峰7和峰8的贡献。中子辐照后HTR的行为复杂且尚未完全理解。观察到在高电离α粒子辐照后复合峰5的形状更宽，这表明HTR与峰5的形状结合使用可改善对高LET粒子的电离密度辨别能力。
