Showing papers by "Stephen W.S. McKeever published in 2021"
TL;DR: In this article, it was shown that defect sites in luminescent materials are primarily complexes extending over multiple lattice sites, and the various clustering mechanisms and recombination pathways that result from defect cluster formation are complex and described by a multitude of relevant parameters.
13 citations
TL;DR: In this article, a method is presented for analyzing complex thermoluminescence glow curves from disordered materials using aluminosilicate glass as an example, and the results obtained are consistent with those obtained by fitting the glow curves individually.
10 citations
TL;DR: In this paper, a co-precipitation method with Mg:Al ratios 1:2 (stoichiometric), 1.5:2 and 1:3 (Al2O3-rich) and calcined at 1000°C in air for 2 hours was used for optically stimulated luminescence (OSL) dosimeters.
8 citations
TL;DR: In this paper, a non-destructive, high-sensitivity, dose-reconstruction method is proposed and tested using optically stimulated luminescence (OSL) from protective back-glasses from modern smartphones.
7 citations
01 May 2021
TL;DR: Protective glasses from the back of modern smartphones were tested as potential emergency dosimeters using optically stimulated luminescence (OSL) to exhibit several favorable dosimetric properties including a strong sensitivity to radiation, a linear dose-response relationship, a 3% reproducibility, and a minimum detectable dose in the low tens of milligray, even after significant fading.
Abstract: Protective glasses from the back of modern smartphones were tested as potential emergency dosimeters using optically stimulated luminescence (OSL). The glasses were shown to exhibit several favorable dosimetric properties including a strong sensitivity to radiation, a linear dose-response relationship from 0.1 to 8 Gy, a 3% reproducibility, and a minimum detectable dose in the low tens of milligray, even after significant fading. The OSL signal was observed to lose ~78% and ~90% of the original intensity over 1 h and 1 week, respectively; however, a fading curve was developed to correct for any such signal loss. A dose-recovery test demonstrated that reconstructed doses were capable of accuracies within 20%.
6 citations
TL;DR: In this article, the shape of the optically stimulated luminescence (OSL) signals can be fitted by a combination of an exponentially decaying function and a power function, and the dose response relationship was linear in the range 0 −7 Gy if the OSL signals were measured at the same effective time after irradiation and normalized to the response to a test dose.
3 citations