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A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C

The dosimeters used to monitor industrial irradiation processing commonly experience significant temperature rises that must be considered in the dose analysis stage. The irradiation-temperature coefficient for a dosimetry system is derived from the dosimeter’s radiation response to the absorbed dos...

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Detalles Bibliográficos
Autores principales: Desrosiers, M. F., Forney, A. M., Puhl, J. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4553870/
https://www.ncbi.nlm.nih.gov/pubmed/26900519
http://dx.doi.org/10.6028/jres.117.007
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author Desrosiers, M. F.
Forney, A. M.
Puhl, J. M.
author_facet Desrosiers, M. F.
Forney, A. M.
Puhl, J. M.
author_sort Desrosiers, M. F.
collection PubMed
description The dosimeters used to monitor industrial irradiation processing commonly experience significant temperature rises that must be considered in the dose analysis stage. The irradiation-temperature coefficient for a dosimetry system is derived from the dosimeter’s radiation response to the absorbed dose and the irradiation temperature. This temperature coefficient is typically expressed in percent change per degree. The temperature rise in dosimeters irradiated with high-intensity ionizing radiation sources can be appreciable. This is especially true for electron-beam processing in which dosimeter temperatures can approach 80 °C. A recent National Institute of Standards and Technology (NIST) study revealed modest (0.5 % to 1.0 %) deviations from the predicted value at temperatures above 70 °C for absorbed doses of 1 kGy and 20 kGy. However, these data were inconsistent with a concurrent manuscript published by National Physical Laboratory (NPL) researchers that found a significant dose-dependent non-linear alanine response but used dosimeters from a different manufacturer and a different experimental design. The current work was undertaken to reconcile the two studies. Alanine dosimeters from each manufacturer used by NIST and NPL were co-irradiated over a wide range of absorbed dose and irradiation temperature. It was found that though there was a slight variation in the temperature coefficient between the two alanine dosimeter sources both systems were linear with irradiation temperature up to 70 °C and the NPL observations of non-linearity were not reproduced. These data confirmed that there is no fundamental difference in the two commercial alanine dosimeter sources and that temperature corrections could be made on industrial irradiations at the extremes of irradiation temperature and absorbed dose.
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spelling pubmed-45538702016-02-19 A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C Desrosiers, M. F. Forney, A. M. Puhl, J. M. J Res Natl Inst Stand Technol Article The dosimeters used to monitor industrial irradiation processing commonly experience significant temperature rises that must be considered in the dose analysis stage. The irradiation-temperature coefficient for a dosimetry system is derived from the dosimeter’s radiation response to the absorbed dose and the irradiation temperature. This temperature coefficient is typically expressed in percent change per degree. The temperature rise in dosimeters irradiated with high-intensity ionizing radiation sources can be appreciable. This is especially true for electron-beam processing in which dosimeter temperatures can approach 80 °C. A recent National Institute of Standards and Technology (NIST) study revealed modest (0.5 % to 1.0 %) deviations from the predicted value at temperatures above 70 °C for absorbed doses of 1 kGy and 20 kGy. However, these data were inconsistent with a concurrent manuscript published by National Physical Laboratory (NPL) researchers that found a significant dose-dependent non-linear alanine response but used dosimeters from a different manufacturer and a different experimental design. The current work was undertaken to reconcile the two studies. Alanine dosimeters from each manufacturer used by NIST and NPL were co-irradiated over a wide range of absorbed dose and irradiation temperature. It was found that though there was a slight variation in the temperature coefficient between the two alanine dosimeter sources both systems were linear with irradiation temperature up to 70 °C and the NPL observations of non-linearity were not reproduced. These data confirmed that there is no fundamental difference in the two commercial alanine dosimeter sources and that temperature corrections could be made on industrial irradiations at the extremes of irradiation temperature and absorbed dose. [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 2012-05-02 /pmc/articles/PMC4553870/ /pubmed/26900519 http://dx.doi.org/10.6028/jres.117.007 Text en https://creativecommons.org/publicdomain/zero/1.0/ The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
spellingShingle Article
Desrosiers, M. F.
Forney, A. M.
Puhl, J. M.
A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C
title A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C
title_full A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C
title_fullStr A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C
title_full_unstemmed A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C
title_short A Comparison of Harwell & FWT Alanine Temperature Coefficients from 25 °C to 80 °C
title_sort comparison of harwell & fwt alanine temperature coefficients from 25 °c to 80 °c
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4553870/
https://www.ncbi.nlm.nih.gov/pubmed/26900519
http://dx.doi.org/10.6028/jres.117.007
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