MgWO4-A new crystal scintillator
MgWO4-A new crystal scintillator
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DOI：
10.1016/j.nima.2009.06.040
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发表时间：
2009-09-01
影响因子：
1.4
通讯作者：
Vostretsov, Yu. Ya.
中科院分区：
文献类型：
--
作者：
Danevich, F. A.;Chernyak, D. M.;Vostretsov, Yu. Ya.
采用助熔剂法首次获得了体积约为1cm（3）的钨酸镁（MgWO 4）晶体。晶体进行了全面的表征，包括室温测量的透射率，X-射线发光光谱，余辉下X-射线激发，相对光电子输出，能量分辨率，闪烁响应伽马量子的非比例性，响应α粒子，γ-量子和α粒子的脉冲形状。在7-305 K温度范围内研究了MgWO 4的光输出和衰减动力学。在X射线激发下，晶体在470 nm处有一个强的发光带，20 ms后的余辉强度为0.035%。测量了一个小的（约0.9克）样品的MgWO 4晶体的能量分辨率为9.1%的662 keV的γ-量子的Cs-137。MgWO_4晶体闪烁体的光电子输出是CdWO_4晶体的35%，是NaI（Tl）晶体的27%。该探测器在α粒子和γ量子测量中显示出脉冲形状辨别能力，这使我们能够评估闪烁体的放射性污染。这些研究的结果表明，这种材料的各种闪烁应用，包括罕见的事件搜索的前景。(c)2008 Elsevier B. V.保留所有权利。
Magnesium tungstate (MgWO4) crystals of similar to 1 cm(3) volume were obtained for the first time using a flux growth technique. The crystal was subjected to comprehensive characterisation that included room-temperature measurements of the transmittance, X-ray luminescence spectra, afterglow under X-ray excitation, relative photoelectron output, energy resolution, non-proportionality of scintillation response to gamma-quanta, response to alpha-particles, and pulse shape for gamma-quanta and alpha-particles. The light output and decay kinetics of MgWO4 were studied over the temperature range 7-305 K. Under X-ray excitation the crystal exhibits an intense luminescence band peaking at a wavelength of 470 nm; the intensity of afterglow after 20 ms is 0.035%. An energy resolution of 9.1% for 662 keV gamma-quanta of Cs-137 was measured with a small ( approximate to 0.9 g) sample of the MgWO4 crystal. The photoelectron output of the MgWO4 crystal scintillator is 35% that of CdWO4 and 27% that of Nal(Tl). The detector showed pulse-shape discrimination ability in measurements with alpha-particles and gamma-quanta, which enabled us to assess the radioactive contamination of the scintillator. The results of these studies demonstrate the prospect of this material for a variety of scintillation applications, including rare event searches. (c) 2008 Elsevier B.V. All rights reserved.