Concentration dependence of dosimetric properties in Ce-doped silicate glasses synthesized by the spark plasma sintering
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Concentration dependence of dosimetric properties in Ce-doped silicate glasses synthesized by the spark plasma sintering method Kosuke Hashimoto1,* , Daiki Shiratori1, Tatsuya Matsuo1, Takumi Kato1, Daisuke Nakauchi1, Noriaki Kawaguchi1, and Takayuki Yanagida1 1
Nara Institute of Science and Technology (NAIST), 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192, Japan
Received: 30 July 2020
ABSTRACT
Accepted: 23 August 2020
We synthesized SiO2 glasses doped with various concentrations of Ce by the spark plasma sintering (SPS) method, and evaluated optical, scintillation, and dosimetric properties. The Ce-doped specimens showed photoluminescence (PL) derived from Ce3? ions at around 400 nm. The highest PL quantum yield was 86.2% among the prepared specimens. The PL lifetime ascribed to the emission from Ce3? was 19.7–24.2 ns. A scintillation peak as well as the PL was observed due to Ce3?. In addition, optically-stimulated luminescence (OSL) and thermally-stimulated luminescence (TSL) spectra confirmed that the Ce-doped specimens showed the OSL and TSL caused by Ce3?, respectively. TSL glow curves with broad shape were observed in all the Ce-doped specimens, and the 0.1, 0.5, and 1% Ce-doped specimens showed linearly response from 0.1 to 100 mGy.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction When we monitor ionizing radiations, two kinds of radiation detectors are used. One is a direct conversion-type detector, and the other is an indirect conversion-type detector. The indirect conversion-type detector is mainly classified into two types, and these materials are called a scintillator [1] and a dosimetric material [2–6]. When ionizing radiations interact with the scintillator, many secondary electrons are generated and transported directly to emission centers, and scintillators emit light. On the other hand, the dosimetric material temporally stores energy of ionizing
radiations as a form of holes and electrons captured at localized trapping centers. These captured electrons receive energy from external stimulation by heat or light and emit light by recombination at luminescent center. The case of stimulation by heat is called thermally-stimulated luminescence (TSL) [7], on the other hand the case of stimulation by light is called optically-stimulated luminescence (OSL) [8]. Moreover, in the case that new emission centers are generated by capturing electrons or holes, photoluminescence (PL) from newly generated emission centers is called radio-photoluminescence (RPL) [9, 10]. An intensity of storage-type luminescence
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https://doi.org/10.1007/s10854-020-04329-z
J Mater Sci: Mater Electron
depends on the radiation dose accumulated for a certain period of time. Therefore, the storage-type luminescent materials exhibiting TSL, OSL, or RPL can be used as radiation detectors such as imaging plates and personal dosimeters. Today, most dosimetric materials utilized as dose monitoring applications are ceramics an
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