OSL dosimetry with protective glasses of modern smartphones: A fiber-optic, non-destructive approach

摘要

A non-destructive, optically stimulated luminescence (OSL) technique was tested on samples of back protective glasses from modern smartphones for possible application in post-exposure radiation triage following a radiological accident. Excitation light from a green-wavelength laser was directed to the samples using an optical fiber; the same optical fiber was used to direct the emission light from the sample to a photomultiplier tube. Excitation and emission beams were separated using a combination of a dichroic mirror, optical filters, and time resolution. It was found that all tested samples fell into two different categories. Category 1 included Gorilla Glass 3 (GG3) and Gorilla Glass 4 (GG4) samples, while Category 2 included samples from Gorilla Glass 5 (GG5) glass. The radiation sensitivity of samples from Category 1 was about one order of magnitude higher than that of Category 2 glass. Minimum detectable doses determined for the pulse OSL mode were about 1 Gy and 10 Gy for Categories 1 and 2, respectively, for samples measured immediately after irradiation. Fading of the OSL signal measured in the CW-OSL mode was-75% and-84% one day after irradiation and-82% and-88% over one week for Categories 1 and 2, respectively. It was concluded that the back glasses demonstrate a feasible line of future research for potential use as emergency OSL dosimeters, provided they were covered by an opaque cover both during and after an emergency exposure and are then analyzed within a few days following the incident.