A novel Al2O3 fluorescent nuclear track detector for heavy charged particles and neutrons
A novel Al2O3 fluorescent nuclear track detector for heavy charged particles and neutrons
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DOI：
10.1016/j.nimb.2006.01.056
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发表时间：
2006-06-01
影响因子：
1.3
通讯作者：
Yasuda, N.
中科院分区：
文献类型：
--
作者：
Akselrod, G. M.;Akselrod, M. S.;Yasuda, N.
Landauer，Inc.最近开发了一种新型Al 2 O 3荧光核径迹探测器（FNTD），已经证明灵敏度和功能上级现有的核径迹探测器。FNTD基于掺杂有碳和镁的氧化铝的单晶，并且具有聚集的氧空位缺陷（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。使用共聚焦荧光显微镜进行检测器的非破坏性读出。沿着重带电粒子（RCP）的轨道扫描荧光强度的三维空间分布允许重建通过晶体的粒子轨迹，并且可以基于荧光强度将LET确定为沿着轨迹的距离的函数。与常规处理的CR-39塑料核径迹探测器相比，Al_2 O_3：C，Mg FNTD的主要优点包括：上级空间分辨率高，LET灵敏度范围宽，探测器不需要辐照后化学处理，以及探测器退火和重复使用的能力。初步实验表明，该材料具有< 1 keV/μ m的低LET阈值，在高达1800 keV/μ m的水中LET下不会饱和，并且能够在超过10（6）cm（-2）的注量下辐照而不饱和（径迹重叠）。(c)2006 Elsevier B. V.保留所有权利。
A novel Al2O3 fluorescent nuclear track detector (FNTD), recently developed by Landauer, Inc., has demonstrated sensitivity and functionality superior to that of existing nuclear track detectors. The FNTD is based on single crystals of aluminum oxide doped with carbon and magnesium, and having aggregate oxygen vacancy defects (Al2O3:C,Mg). Radiation-induced color centers 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. Non-destructive readout of the detector is performed using a confocal fluorescence microscope. Scanning of the three-dimensional spatial distribution of fluorescence intensity along the track of a heavy charged particle (RCP) permits reconstruction of particle trajectories through the crystal and the LET can be determined as a function of distance along the trajectory based on the fluorescence intensity. Major advantages of Al2O3:C,Mg FNTD over conventionally processed CR-39 plastic nuclear track detector include superior spatial resolution, a wider range of LET sensitivity, no need for post-irradiation chemical processing of the detector and the capability to anneal and reuse the detector. Preliminary experiments have demonstrated that the material possesses a low-LET threshold of < 1 keV/mu m, does not saturate at LET in water as high as 1800 keV/mu m, and is capable of irradiation to fluences in excess of 10(6) cm(-2) without saturation (track overlap). (c) 2006 Elsevier B.V. All rights reserved.