Al_2O_3:C、LiF:Mg,Ti、LiF:Mg,Cu,P对本底辐射的热释光响应比较  

Thermoluminescence comparison among Al_2O_3:C, LiF:Mg,Ti and LiF:Mg,Cu,P for natural radiation background measurement

作　　者：陈劲民[1] 李永强[1] 熊正烨[1] 王文华[1] 封余军[1] 黄存友[1] 汤照[1] 师文庆[1] 

机构地区：[1]广东海洋大学理学院,湛江524088

出　　处：《核技术》2012年第2期109-112,共4页Nuclear Techniques

基　　金：湛江市科技攻关项目;广东海洋大学科研基金资助

摘　　要：用Al2O3:C、LiF:Mg,Ti、LiF:Mg,Cu,P热释光剂量计(TLD)测量湛江市区本底辐射的热释光响应,以选取适合低辐射场辐射剂量测量的TLD。它们的最低响应剂量依次为Al2O3:C(1–2μGy)、LiF:Mg,Cu,P(约2μGy)和LiF:Mg,Ti(>10μGy)。Al2O3:C的热释光峰温较低,对较长时间段(>30 d)的累积剂量,存在较明显的热释光衰退,剂量响应曲线偏离线性;LiF:Mg,Cu,P和LiF:Mg,Ti的发光峰温较高,数年内都很稳定。综合考虑灵敏度和稳定性,LiF:Mg,Cu,P更宜于低辐射场的累积剂量测量。To select thermoluminescent dosimeters （TLDs） for low radiation research, therrnoluminescence responses of Al2O3：C, LiF：Mg,Ti and LiF：Mg,Cu,P were measured under natural radiation background in Zhanjiang city, China. TL sensitivity of the three TLDs, in terms of the threshold dose, is sequenced as Al2O3：C （1-2 μGy）, LiF：Mg, Cu,P （about 2 μGy）, and LiF：Mg, Ti （〉10 μGy）. However, as the temperature of glow peak of Al2O3：C is not so high, its TL decays in a relatively long period, hence the non-linearity of the TL dose response curve of Al2O3：C, while temperatures of glow peaks of LiF：Mg,Ti and LiF：Mg,Cu, P are higher, hence their linear TL dose response. Therefore, LiF：Mg,Cu,P is the best TLD for low radiation cumulative dose detection.

关 键 词：热释光 本底辐射 AL2O3 LIF 

分 类 号：O483[理学—固体物理] TL99[理学—物理]