Academic Journal
Experimental assessment of a phosphor model for estimating the relative extrinsic efficiency in radioluminescent detectors.
| Τίτλος: | Experimental assessment of a phosphor model for estimating the relative extrinsic efficiency in radioluminescent detectors. |
|---|---|
| Συγγραφείς: | Lindström J; Department of Medical Physics & Nuclear Medicine, Karolinska University Hospital, S-171 76 Stockholm, Sweden. Electronic address: jan.lindstrom@sll.se., Alm Carlsson G; Department of Radiation Physics, Faculty of Health Sciences, Linköping University, S-581 85 Linköping, Sweden., Wåhlin E; Department of Medical Physics & Nuclear Medicine, Karolinska University Hospital, S-171 76 Stockholm, Sweden., Carlsson Tedgren Å; Department of Medical Physics & Nuclear Medicine, Karolinska University Hospital, S-171 76 Stockholm, Sweden; Department of Radiation Physics, Faculty of Health Sciences, Linköping University, S-581 85 Linköping, Sweden., Poludniowski G; Department of Medical Physics & Nuclear Medicine, Karolinska University Hospital, S-171 76 Stockholm, Sweden. |
| Πηγή: | Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) [Phys Med] 2020 Aug; Vol. 76, pp. 117-124. Date of Electronic Publication: 2020 Jul 13. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Istituti Editoriali e Poligrafici Internazionali Country of Publication: Italy NLM ID: 9302888 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1724-191X (Electronic) Linking ISSN: 11201797 NLM ISO Abbreviation: Phys Med Subsets: MEDLINE |
| Imprint Name(s): | Publication: Pisa : Istituti Editoriali e Poligrafici Internazionali Original Publication: Lugano, Switzerland : Giardini editori S.A. |
| Ιατρικοί όροι (MeSH): | X-Ray Intensifying Screens*, Monte Carlo Method ; X-Rays |
| Περίληψη: | Optimising phosphor screens in dose detectors or imaging sensor designs is a cumbersome and time- consuming work normally involving specialised measuring equipment and advanced modelling. It is known that crucial optical parameters of the same phosphor may vary within a wide range of values. The aim of this work was to experimentally assess a simple previously published model where the case specific optical parameters (scattering and absorption) are instead represented by a fixed, single parameter, the light extinction factor, ξ. The term extrinsic efficiency, N, of a phosphor is also introduced, differing from the common denotation "absolute efficiency", after noting that unknown factors (such as temperature dependence) can have an influence during efficiency estimations and hence difficult to claim absoluteness. N is expressed as the ratio of light energy emitted per unit area at the phosphor surface to incident x-ray energy fluence. By focusing on ratios and relative changes in this study, readily available instruments in a Medical Physics Department (i.e. a photometer) could be used. The varying relative extrinsic efficiency for an extended range of particle sizes (7.5 and 25 µm) and layer thicknesses (220 to 830 µm) were calculated in the model from the input parameters: the mean particle size of the phosphor, the layer thickness, the light extinction factor and the calculated energy imparted to the layer. In-house manufactured screens (Gd (Copyright © 2020. Published by Elsevier Ltd.) |
| Contributed Indexing: | Keywords: Energy transport; Extrinsic efficiency; Fluorescence; Optimisation; Phosphor model; Radioluminescence |
| Entry Date(s): | Date Created: 20200717 Date Completed: 20210624 Latest Revision: 20210624 |
| Update Code: | 20260130 |
| DOI: | 10.1016/j.ejmp.2020.07.009 |
| PMID: | 32673823 |
| Βάση Δεδομένων: | MEDLINE |
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