当前位置: X-MOL 学术Radiat. Meas. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A non-destructive, high-sensitivity, emergency dosimetry method using OSL from protective back-glasses from smartphones
Radiation Measurements ( IF 2 ) Pub Date : 2021-08-08 , DOI: 10.1016/j.radmeas.2021.106646
S. Sholom 1 , S.W.S. McKeever 1
Affiliation  

A non-destructive, high-sensitivity, dose-reconstruction method is proposed and tested using optically stimulated luminescence (OSL) from protective back-glasses from modern smartphones. A custom-made OSL reader, capable of accommodating the entire phone, has been built for this purpose and preliminary results are reported. The back-glass is stimulated using several light-emitting diodes (LEDs) while a radiation-induced OSL signal is detected with a high-sensitivity photomultiplier tube. A set of appropriate filters is used for separation of stimulation and emission light. The sensitivity of the system was tested for different wavelengths (colors) of stimulation light. A maximum sensitivity was observed using so-called Royal Blue LEDs, with stimulation centered at a wavelength of 447.5 nm. The following dosimetric properties have been studied: (1) background and radiation-induced OSL curves; (2) dose-response curves for several back-glasses from different phones and the corresponding values of the minimum detectable doses; and (3) fading of the OSL signal with time after irradiation. Background (BG) OSL signals were negligible in all tested phones except one (an iPhone 11), in which the BG signal was equivalent to a dose of ~157 mGy. However, the BG OSL had a different decay-curve shape compared to that of the radiation-induced signal (RIS). This difference in shape allows the two signals to be distinguished and separated. Strong, radiation-induced OSL signals were observed in all glasses after irradiation, but with significant variability in sensitivity among the different phones. The dose-response relationships for all phones were linear in the range 0–2.7 Gy when the OSL signals were measured at the same effective time after irradiation. Values of the minimum detectable doses were in the range 0.2–4.3 mGy for the different phones when measured 3 min after exposure. Fading of the OSL signal was observed for storage times up to 11 days after irradiation and was best-fitted by a power function. Dose recovery tests were carried out on two phones intentionally exposed to a dose of 266 mGy and their OSL measured 6 and 7 days, respectively, after irradiation. During these periods the phones were kept in their original cases but were used as usual for calls, messages, internet surfing, etc. Fading-corrected OSL doses were determined to be 199 mGy and 220 mGy, respectively, which are within 25% of the nominal value.



中文翻译:

一种使用来自智能手机保护后玻璃的 OSL 的非破坏性、高灵敏度、紧急剂量测定方法

提出了一种非破坏性、高灵敏度、剂量重建方法,并使用现代智能手机保护后玻璃的光学受激发光 (OSL) 进行测试。为此目的构建了一个定制的 OSL 阅读器,能够容纳整个手机,并报告了初步结果。使用多个发光二极管 (LED) 刺激后玻璃,同时使用高灵敏度光电倍增管检测辐射引起的 OSL 信号。一组合适的过滤器用于分离刺激光和发射光。针对不同波长(颜色)的刺激光测试了系统的灵敏度。使用所谓的 Royal Blue LED 观察到最大灵敏度,刺激以 447.5 nm 的波长为中心。已经研究了以下剂量学特性:(1) 背景和辐射诱导的 OSL 曲线;(2) 不同手机的几种后视镜的剂量反应曲线和对应的最小可检测剂量值;(3) OSL 信号在辐照后随时间衰减。在所有测试手机中,背景 (BG) OSL 信号都可以忽略不计,除了一部(iPhone 11),其中 BG 信号相当于~157 mGy 的剂量。然而,与辐射诱导信号 (RIS) 相比,BG OSL 具有不同的衰减曲线形状。这种形状上的差异允许区分和分离两个信号。辐照后,所有眼镜均观察到强辐射诱导的 OSL 信号,但不同手机之间的灵敏度存在显着差异。所有音素的剂量反应关系在 0-2 范围内呈线性。在辐照后的同一有效时间测量 OSL 信号时为 7 Gy。在暴露后 3 分钟测量时,不同手机的最小可检测剂量值在 0.2-4.3 mGy 范围内。在辐照后长达 11 天的存储时间内观察到 OSL 信号的衰减,并且通过幂函数进行了最佳拟合。对两部故意暴露于 266 mGy 剂量的手机进行了剂量恢复测试,并分别在辐射后 6 天和 7 天测量了它们的 OSL。在此期间,手机保持在原来的情况下,但照常用于通话、消息、上网等。 衰落校正的 OSL 剂量分别确定为 199 mGy 和 220 mGy,在 25% 的范围内。面值。在暴露后 3 分钟测量时,不同手机的最小可检测剂量值在 0.2-4.3 mGy 范围内。在辐照后长达 11 天的存储时间内观察到 OSL 信号的衰减,并且通过幂函数进行了最佳拟合。对两部故意暴露于 266 mGy 剂量的手机进行了剂量恢复测试,并分别在辐射后 6 天和 7 天测量了它们的 OSL。在此期间,手机仍保留在原来的外壳中,但仍像往常一样用于通话、消息、上网等。 经衰落校正的 OSL 剂量分别确定为 199 mGy 和 220 mGy,在 25% 的范围内。面值。在暴露后 3 分钟测量时,不同手机的最小可检测剂量值在 0.2-4.3 mGy 范围内。在辐照后长达 11 天的存储时间内观察到 OSL 信号的衰减,并且通过幂函数进行了最佳拟合。对两部故意暴露于 266 mGy 剂量的手机进行了剂量恢复测试,并分别在辐射后 6 天和 7 天测量了它们的 OSL。在此期间,手机保持在原来的情况下,但照常用于通话、消息、上网等。 衰落校正的 OSL 剂量分别确定为 199 mGy 和 220 mGy,在 25% 的范围内。面值。在辐照后长达 11 天的存储时间内观察到 OSL 信号的衰减,并且通过幂函数进行了最佳拟合。对两部故意暴露于 266 mGy 剂量的手机进行了剂量恢复测试,并分别在辐射后 6 天和 7 天测量了它们的 OSL。在此期间,手机保持在原来的情况下,但照常用于通话、消息、上网等。 衰落校正的 OSL 剂量分别确定为 199 mGy 和 220 mGy,在 25% 的范围内。面值。在辐照后长达 11 天的存储时间内观察到 OSL 信号的衰减,并且通过幂函数进行了最佳拟合。对两部故意暴露于 266 mGy 剂量的手机进行了剂量恢复测试,并分别在辐射后 6 天和 7 天测量了它们的 OSL。在此期间,手机保持在原来的情况下,但照常用于通话、消息、上网等。 衰落校正的 OSL 剂量分别确定为 199 mGy 和 220 mGy,在 25% 的范围内。面值。

更新日期:2021-08-10
down
wechat
bug