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TL/OSL Properties of Calcium Oxide Nanophosphor
Published in Odireleng Martin Ntwaeaborwa, Luminescent Nanomaterials, 2022
K.R. Nagabhushana, Sonia Hatsue Tatumi, D. Prakash
The study of optically stimulated luminescence (OSL) properties of phosphor materials is a major field of research in radiation dosimetry. OSL is a process resulting in light emission from an insulator or semiconductor previously exposed to ionizing radiation when the material is stimulated with visible photon [36,37]. OSL dosimetry is successfully used for monitoring of radiation of persons working in an ionizing radiation environment, nuclear accidents, cosmic radiation in space, radiation facilities in health and power sectors, geochronology (dating of sediments) and environmental radiation monitoring [38]. In particular, OSL is effectively used in medical [38], personal [39], retrospective [40], and accident dosimetry [36]. In addition to being of use for radiation dosimetry, the OSL signal contains information about the distribution of traps and recombination centers in the crystals. OSL signals can also provide insights into the charge excitation, movement of traps and their recombination in crystals. Such insights will lead to improving our understanding of the luminescence mechanism [41].
Borate Phosphors for Radiation Dosimetery
Published in S. K. Omanwar, R. P. Sonekar, N. S. Bajaj, Borate Phosphors, 2022
The basis of OSL measurement is to stimulate an irradiated sample with the light of a selected wavelength and to monitor the emission from the sample at a different wavelength. Different modes of stimulation that are widely used are continuous wave-OSL (CW-OSL), linearly modulated (LM-OSL) and pulsed OSL (P-OSL).
Luminescent, Film, and Cryogenic Detectors
Published in Douglas S. McGregor, J. Kenneth Shultis, Radiation Detection, 2020
Douglas S. McGregor, J. Kenneth Shultis
Natural Materials Luminescent spectra from several minerals can be used for dating and dosimetry characterization [Krbetschek et al. 1997]. Both thermoluminescence and optically stimulated luminescence have been used to characterize these minerals, mainly to obtain information on recombination site energies, possible information on trap energies, and also for use in retrospective dosimetry. Possibly the two most investigated minerals for OSL dosimetry applications are quartz and feldspar, originally studied by Huntley et al. [1985]. However, difficulties with using natural minerals for dosimetry arise from compositional differences, activator differences, and various inclusions which usually contaminate natural crystals. Consequently, luminescent spectra are variable and depend on the origin of the mineral. Further, OSL emissions are a function of the thermal history of the samples, with samples exposed to high temperature having much lower luminosity [Bøtter-Jensen and McKeever 1996].
Study on the comprehensive countermeasures for coastal erosion of Kujukuri Beach
Published in Coastal Engineering Journal, 2019
Ryotaro Shibata, Shinji Sato, Yusuke Yamanaka
Quartz or feldspar in sand particles includes electrons excited by natural radiation. When they are exposed to light or heat, some of the excited electrons return to ground state with light emission (luminescence) depending on their energy level (Aitken, 1998). The luminescence induced by heat is called thermoluminescence (TL), whereas that induced by light is called optically stimulated luminescence (Aitken, 1998). By measuring the luminescence intensity, the number of excited electrons can be measured, which reflects the sedimentation and the transport process; excited electrons increase with the natural radiation while the particle is buried underground and decrease with the exposure to light during fluvial/nearshore transportation (Rink 2003).