Please use this identifier to cite or link to this item: http://hdl.handle.net/11400/4561
Title: Investigation of radiation absorption and X-ray fluorescence properties of medical imaging scintillators by Monte Carlo methods
Authors: Νικολόπουλος, Δημήτριος
Κανδαράκης, Ιωάννης Σ.
Κάβουρας, Διονύσης Α.
Βαλαής, Ιωάννης Γ.
Λιναρδάτος, Διονύσης
Contributors: Μιχαήλ, Χρήστος Μ.
Δαυίδ, Στράτος Λ.
Γαϊτάνης, Αναστάσιος
Νομικός, Κωνσταντίνος Δ.
Λουίτζη, Άννα
Item type: Journal article
Keywords: Scintillators;X-ray imaging;Σπινθηριστές;Απεικόνιση με ακτίνες Χ
Subjects: Medicine
Physics
Ιατρική
Φυσική
Issue Date: 22-Jan-2015
2006
Date of availability: 22-Jan-2015
Publisher: Elsevier Science Ltd
Abstract: X-ray absorption and X-ray fluorescence properties of medical imaging scintillating screens were studied by Monte Carlo methods as a function of the incident photon energy and screen-coating thickness. The scintillating materials examined were Gd2O2S, (GOS) Gd2SiO5 (GSO) YAlO3 (YAP), Y3Al5O12 (YAG), LuSiO5 (LSO), LuAlO3 (LuAP) and ZnS. Monoenergetic photon exposures were modeled in the range from 10 to 100 keV. The corresponding ranges of coating thicknesses of the investigated scintillating screens ranged up to 200 mg cm−2. Results indicated that X-ray absorption and X-ray fluorescence are affected by the incident photon energy and the screen's coating thickness. Regarding incident photon energy, this X-ray absorption and fluorescence was found to exhibit very intense changes near the corresponding K edge of the heaviest element in the screen's scintillating material. Regarding coating thickness, thicker screens exhibited higher X-ray absorption and X-ray fluorescence. Results also indicated that a significant fraction of the generated X-ray fluorescent quanta escape from the scintillating screen. This fraction was found to increase with screen's coating thickness. At the energy range studied, most of the incident photons were found to be absorbed via one-hit photoelectric effect. As a result, the reabsorption of scattered radiation was found to be of rather minor importance; nevertheless this was found to increase with the screen's coating thickness. Differences in X-ray absorption and X-ray fluorescence were found among the various scintillators studied. LSO scintillator was found to be the most attractive material for use in many X-ray imaging applications, exhibiting the best absorption properties in the largest part of the energy range studied. Y-based scintillators were also found to be of significant absorption performance within the low energy ranges.
Language: English
Citation: Nikolopoulos, D., Kandarakis, I., Cavouras, D., Valais, I., Linardatos, D., et al. (September 2006). Investigation of radiation absorption and X-ray fluorescence properties of medical imaging scintillators by Monte Carlo methods. Nuclear Instruments and Methods in Physics Research A. 565(2). pp. 821–832. Elsevier Science Ltd. Available from: http://www.sciencedirect.com [Accessed 30/06/2006]
Journal: Nuclear Instruments and Methods in Physics Research A
Type of Journal: With a review process (peer review)
Access scheme: Publicly accessible
License: Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες
URI: http://hdl.handle.net/11400/4561
Appears in Collections:Δημοσιεύσεις

Files in This Item:
File Description SizeFormat 
Investigation of radiation absorption and X-ray fluorescence.pdf982.46 kBAdobe PDFView/Open


This item is licensed under a Creative Commons License Creative Commons