Confocal fluorescent imaging of tracks from heavy charged particles utilising new Al2O3:C,Mg crystals
Confocal fluorescent imaging of tracks from heavy charged particles utilising new Al2O3:C,Mg crystals
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DOI：
10.1093/rpd/nci664
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发表时间：
2006-09-01
影响因子：
1
通讯作者：
Akselrod, Gleb M.
中科院分区：
文献类型：
--
作者：
Akselrod, Mark S.;Yoder, R. Craig;Akselrod, Gleb M.
荧光晶体中径迹的完全光学、非破坏性成像提供了一种新的方法来检测和评估重带电粒子和中子的剂量。该技术结合了共聚焦荧光显微镜与一种新的辐射敏感，发光材料的基础上，氧化铝单晶掺杂碳，镁和具有聚合氧空位缺陷（Al 2 O3：C，Mg）。新材料中的辐射诱导色心在620 nm处具有吸收带，并在750 nm处产生荧光，具有高量子产率和短的75 +/- 5 ns荧光寿命。荧光强度的三维空间分布允许人们获得深度剂量分布，并区分高和低线性能量转移辐射。已经获得了由不同类型的辐射产生的单径迹的图像。经校准的Am-241 α源的照射显示出高效率的轨道检测。热中子的探测是利用核反应与（LiF）-Li-6辐射器和生产的α粒子和氚离子。快中子的探测使用反冲质子产生的聚乙烯辐射器安装在前面的晶体探测器。证明了反冲质子在晶体中传播的三维重建。
A completely optical, non-destructive imaging of tracks in a fluorescent crystal provides a new way to detect and to assess doses from heavy charged particles and neutrons. The technique combines confocal fluorescent microscopy with a new radiation-sensitive, luminescent material based on aluminium oxide single crystals doped with carbon, magnesium and having aggregate oxygen vacancy defects (Al2O3:C,Mg). Radiation-induced colour centres in the new material have an absorption band at 620 nm and produce fluorescence at 750 nm with a high quantum yield and a short, 75 +/- 5 ns, fluorescence lifetime. Three-dimensional spatial distribution of fluorescent intensity allows one to obtain depth-dose distributions and to discriminate between high- and low-linear energy transfer radiations. Images of single tracks produced by different types of radiation have been obtained. Irradiations with a calibrated Am-241 alpha source showed high efficiency for track detection. Thermal neutrons were detected using a nuclear reaction with a (LiF)-Li-6 radiator and production of alpha particles and tritium ions. Fast neutrons were detected using recoil protons produced in a polyethylene radiator installed in front of the crystalline detector. Three-dimensional reconstruction of a recoil proton propagating through the crystal was demonstrated.