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Title: High-resolution digital dosimetric system for spatial characterization of radiation fields using a thermoluminescent CaF2:Dy crystal

Abstract

A high-resolution digital dosimetric system has been developed for the spatial characterization of radiation fields. The system comprises the following: 0.5-mm-thick, 25-mm-diam CaF2:Dy thermoluminescent crystal; intensified charge coupled device video camera; video cassette recorder; and a computerized image processing subsystem. The optically flat single crystal is used as a radiation imaging device and the subsequent thermally stimulated phosphorescence is viewed by the intensified camera for further processing and analysis. Parameters governing the performance characteristics of the system were measured. A spatial resolution limit of 31 +/- 2 microns (1 sigma) corresponding to 16 +/- 1 line pairs/mm measured at the 4% level of the modulation transfer function has been achieved. The full width at half maximum of the line spread function measured independently by the slit method or derived from the edge response function was found to be 69 +/- 4 microns (1 sigma). The high resolving power, speed of readout, good precision, wide dynamic range, and the large image storage capacity make the system suitable for the digital mapping of the relative distribution of absorbed doses for various small radiation fields and the edges of larger fields.

Authors:
;
Publication Date:
OSTI Identifier:
5028836
Resource Type:
Journal Article
Journal Name:
Med. Phys.; (United States)
Additional Journal Information:
Journal Volume: 3
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; DOSEMETERS; DESIGN; CALCIUM FLUORIDES; CRYSTALS; DIGITAL SYSTEMS; IMAGE PROCESSING; IMAGES; RADIOACTIVITY; REMOTE VIEWING EQUIPMENT; SPATIAL RESOLUTION; THERMOLUMINESCENCE; ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CALCIUM HALIDES; EQUIPMENT; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; LUMINESCENCE; MEASURING INSTRUMENTS; PROCESSING; RESOLUTION; 440102* - Radiation Instrumentation- Radiation Dosemeters

Citation Formats

Atari, N.A., and Svensson, G.K. High-resolution digital dosimetric system for spatial characterization of radiation fields using a thermoluminescent CaF2:Dy crystal. United States: N. p., 1986. Web. doi:10.1118/1.595875.
Atari, N.A., & Svensson, G.K. High-resolution digital dosimetric system for spatial characterization of radiation fields using a thermoluminescent CaF2:Dy crystal. United States. doi:10.1118/1.595875.
Atari, N.A., and Svensson, G.K. Thu . "High-resolution digital dosimetric system for spatial characterization of radiation fields using a thermoluminescent CaF2:Dy crystal". United States. doi:10.1118/1.595875.
@article{osti_5028836,
title = {High-resolution digital dosimetric system for spatial characterization of radiation fields using a thermoluminescent CaF2:Dy crystal},
author = {Atari, N.A. and Svensson, G.K.},
abstractNote = {A high-resolution digital dosimetric system has been developed for the spatial characterization of radiation fields. The system comprises the following: 0.5-mm-thick, 25-mm-diam CaF2:Dy thermoluminescent crystal; intensified charge coupled device video camera; video cassette recorder; and a computerized image processing subsystem. The optically flat single crystal is used as a radiation imaging device and the subsequent thermally stimulated phosphorescence is viewed by the intensified camera for further processing and analysis. Parameters governing the performance characteristics of the system were measured. A spatial resolution limit of 31 +/- 2 microns (1 sigma) corresponding to 16 +/- 1 line pairs/mm measured at the 4% level of the modulation transfer function has been achieved. The full width at half maximum of the line spread function measured independently by the slit method or derived from the edge response function was found to be 69 +/- 4 microns (1 sigma). The high resolving power, speed of readout, good precision, wide dynamic range, and the large image storage capacity make the system suitable for the digital mapping of the relative distribution of absorbed doses for various small radiation fields and the edges of larger fields.},
doi = {10.1118/1.595875},
journal = {Med. Phys.; (United States)},
number = ,
volume = 3,
place = {United States},
year = {1986},
month = {5}
}