Silver-activated radiophotoluminescent glass: band assignments and a novel readout system using a modulated UV laser diode

Abstract

We investigated the assignments and characteristics of the X-ray-induced colour centres in a silver-activated radiophotoluminescent glass. The inducedabsorption spectrum was decomposed into six Gaussian bands, which were, in turn, attributed to the Ag + , Ag 3 + or Ag 3 2+ , Ag 2 + , Ag 2+ , Ag 0 and hole-trap centres, respectively, by means of optical and thermal measurements. All components of the blue and orange radiophotoluminescence (RPL) in a silver-activated phosphate glass were confirmed to be X-ray-induced colour centres. We also proposed and constructed a new readout system for the measurement of the RPL of the glass dosimeter that considers the characteristics of the radiation-induced bands.

Observation and partly characterisation of silver nanoparticles in X-ray irradiated radiophotoluminescent phosphate glass

“…Concerning the radiation-induced Ag-related species, an optical absorption spectrum of the X-ray-irradiated PG:Ag was decomposed into five individual Gaussian bands, marked "A" to "E", with peaks at 225, 252, 270, 307 and 354 nm, respectively. These bands were, in turn, attributed to Ag + , Ag 3 + or Ag 3 2+ , Ag 2 + , Ag 2+ and Ag 0 centres, respectively, through various optical and thermal measurements [11][12][13]. Moreover, the excitation spectrum consisted of two different bands.…”

“…This may reflect the characteristics of the induced Ag 2 + (Ag + + Ag 0 →Ag 2 + ) centres, i.e., upon changing the Ag 0 centre concentration, the Ag 2 + band with coupling to the Ag 0 centres also changed. optical absorption spectra peaking at 310 nm, which was attributed to Ag 2+ centres [10][11][12][13]. In the case of the GD-450 dosimeter used in this work, the peak intensity at 310 nm linearly increased up to 5 Gy for X-ray irradiation [24].…”

“…Based on a peak-fitting analysis, an RPL decay curve analysis and a heat treatment, the seven decomposed Gaussian bands in X-ray-irradiated PG:Ag with peaks at 192, 225, 252, 270, 307, 354 and 424 nm were attributed to electron-trapped PO 3 , PO 4 and Ag + , Ag 3 2+ or Ag 3 + , Ag 2 + , Ag 2+ , Ag 0 and phosphorus-oxygen-hole centres (POHCs), respectively [11][12][13].…”

“…Radiation-induced Ag 0 centres have also been studied to better understand silver nanoparticles in RPL glass dosimeters for X-ray and γ-radiation applications [10][11][12][13][16][17]. In general, silver nanoparticles in PG:Ag are typically prepared through the introduction of Ag + ions into the host, followed by irradiation with low-intensity femtosecond (fs) laser pulses and subsequent heat treatment at a high temperature for several hours [18,19].…”

Properties of a novel radiophotoluminescent readout system using a cw modulated UV laser diode and phase-sensitive technique

“…Recently, we proposed a new experimental technique (Kurobori et al, 2010b) to measure radiation-induced signal from a commercial RPL glass dosimeter. The purpose of this study is to construct a novel reader for the measurement of the RPL of the glass dosimeter using a modulated cw UV laser diode and phase-sensitive technique.…”