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Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films

Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it i...

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Autores principales: Katsuda, Toshizo, Gotanda, Rumi, Gotanda, Tatsuhiro, Akagawa, Takuya, Tanki, Nobuyoshi, Kuwano, Tadao, Noguchi, Atsushi, Yabunaka, Kouichi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Medknow Publications & Media Pvt Ltd 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5496275/
https://www.ncbi.nlm.nih.gov/pubmed/28706354
http://dx.doi.org/10.4103/jmp.JMP_136_16
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author Katsuda, Toshizo
Gotanda, Rumi
Gotanda, Tatsuhiro
Akagawa, Takuya
Tanki, Nobuyoshi
Kuwano, Tadao
Noguchi, Atsushi
Yabunaka, Kouichi
author_facet Katsuda, Toshizo
Gotanda, Rumi
Gotanda, Tatsuhiro
Akagawa, Takuya
Tanki, Nobuyoshi
Kuwano, Tadao
Noguchi, Atsushi
Yabunaka, Kouichi
author_sort Katsuda, Toshizo
collection PubMed
description Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission intensity. Gafchromic EBT3 films were suitable to be used in this study because non-UV protection layers are present on both sides of the film. The film is placed between UV-A ray light-emitting diodes and a probe of a UV meter. Gafchromic EBT3 films were irradiated by UV-A rays for up to 60 min. Data for analysis were obtained in the subsequent 60 min. Images from before and after UV-A irradiation were subtracted. When using 375 nm UV-A, the mean ± standard deviation (SD) of the pixel values in the subtracted image was remarkably high (11,194.15 ± 586.63). However, the UV-A transmissivity remained constant throughout the 60 min irradiation period. The mean ± SD UV-A transmission intensity was 184.48 ± 0.50 μm/cm(2). Our findings demonstrate that color density changes in Gafchromic EBT3 films do not affect their UV-A transmission. Therefore, Gafchromic films were irradiated by UV-A rays as a preexposure.
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spelling pubmed-54962752017-07-13 Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films Katsuda, Toshizo Gotanda, Rumi Gotanda, Tatsuhiro Akagawa, Takuya Tanki, Nobuyoshi Kuwano, Tadao Noguchi, Atsushi Yabunaka, Kouichi J Med Phys Technical Note Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission intensity. Gafchromic EBT3 films were suitable to be used in this study because non-UV protection layers are present on both sides of the film. The film is placed between UV-A ray light-emitting diodes and a probe of a UV meter. Gafchromic EBT3 films were irradiated by UV-A rays for up to 60 min. Data for analysis were obtained in the subsequent 60 min. Images from before and after UV-A irradiation were subtracted. When using 375 nm UV-A, the mean ± standard deviation (SD) of the pixel values in the subtracted image was remarkably high (11,194.15 ± 586.63). However, the UV-A transmissivity remained constant throughout the 60 min irradiation period. The mean ± SD UV-A transmission intensity was 184.48 ± 0.50 μm/cm(2). Our findings demonstrate that color density changes in Gafchromic EBT3 films do not affect their UV-A transmission. Therefore, Gafchromic films were irradiated by UV-A rays as a preexposure. Medknow Publications & Media Pvt Ltd 2017 /pmc/articles/PMC5496275/ /pubmed/28706354 http://dx.doi.org/10.4103/jmp.JMP_136_16 Text en Copyright: © 2017 Journal of Medical Physics http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.
spellingShingle Technical Note
Katsuda, Toshizo
Gotanda, Rumi
Gotanda, Tatsuhiro
Akagawa, Takuya
Tanki, Nobuyoshi
Kuwano, Tadao
Noguchi, Atsushi
Yabunaka, Kouichi
Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films
title Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films
title_full Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films
title_fullStr Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films
title_full_unstemmed Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films
title_short Intensities of Incident and Transmitted Ultraviolet-A Rays through Gafchromic Films
title_sort intensities of incident and transmitted ultraviolet-a rays through gafchromic films
topic Technical Note
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5496275/
https://www.ncbi.nlm.nih.gov/pubmed/28706354
http://dx.doi.org/10.4103/jmp.JMP_136_16
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