Absorption spectrum of gafchromic® EBT2 film with angular rotation

Soah Park, Kwang Ho Cheong, Taejin Hwang, Jai Woong Yoon, Taejin Han, Haeyoung Kim, Me Yeon Lee, Kyoung Ju Kim, Hoonsik Bae, Sei Kwon Kang, Seung Jae Oh, Yong Min Huh, Jin Suck Suh

Research output: Contribution to journalArticle

Abstract

Study of the absorption spectrum in film dosimetry is important because the spectral absorbance of the film is related to the film’s total absorption dose. We investigated the absorption spectra of Gafchromic EBT2 film at various rotational angles in a visible wavelength band. The film was irradiated with 6- MV photon beams for a total dose of 300 cGy. The absorption spectra for different angles of rotation were obtained 24 h after the irradiation and we fitted the spectra by using Lorentzian functions. Two dominant absorption peaks, one at approximately 586 nm (green) and the other at 634 nm (red) were observed. The measured spectrum was decomposed into peaks at 542 nm, 558 nm, 578 nm, 586 nm, 626 nm, 634 nm, and 641 nm. The maximum total area of the red absorption band occurred at 45° (225°) and the minimum at 90° (270°). As the angle of rotation changed, the intensities and integrated areas of the blue and the green peaks also changed with a 180° period, with minima at 90° and 270°, and maxima at 0° and 180°, although the overall absorbance was very low. The spectral peak wavelengths remained constant within ±1.2 nm for all angles. The absorption spectrum of the film should no hysteresis of; spectra taken at 0° and 360° were substantially the same and showed similar behaviors for all rotational angles. The change in the absorbance with the rotational angle of the film affected the dosimetric properties, resulting in rotational variations of the film’s dosimetry in each red-green-blue channel.

Original languageEnglish
Pages (from-to)52-56
Number of pages5
JournalJournal of the Korean Physical Society
Volume67
Issue number1
DOIs
Publication statusPublished - 2015 Jul 31

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absorption spectra
dosimeters
dosage
photon beams
wavelengths
hysteresis
irradiation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Park, Soah ; Cheong, Kwang Ho ; Hwang, Taejin ; Yoon, Jai Woong ; Han, Taejin ; Kim, Haeyoung ; Lee, Me Yeon ; Kim, Kyoung Ju ; Bae, Hoonsik ; Kang, Sei Kwon ; Oh, Seung Jae ; Huh, Yong Min ; Suh, Jin Suck. / Absorption spectrum of gafchromic® EBT2 film with angular rotation. In: Journal of the Korean Physical Society. 2015 ; Vol. 67, No. 1. pp. 52-56.
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title = "Absorption spectrum of gafchromic{\circledR} EBT2 film with angular rotation",
abstract = "Study of the absorption spectrum in film dosimetry is important because the spectral absorbance of the film is related to the film’s total absorption dose. We investigated the absorption spectra of Gafchromic EBT2 film at various rotational angles in a visible wavelength band. The film was irradiated with 6- MV photon beams for a total dose of 300 cGy. The absorption spectra for different angles of rotation were obtained 24 h after the irradiation and we fitted the spectra by using Lorentzian functions. Two dominant absorption peaks, one at approximately 586 nm (green) and the other at 634 nm (red) were observed. The measured spectrum was decomposed into peaks at 542 nm, 558 nm, 578 nm, 586 nm, 626 nm, 634 nm, and 641 nm. The maximum total area of the red absorption band occurred at 45° (225°) and the minimum at 90° (270°). As the angle of rotation changed, the intensities and integrated areas of the blue and the green peaks also changed with a 180° period, with minima at 90° and 270°, and maxima at 0° and 180°, although the overall absorbance was very low. The spectral peak wavelengths remained constant within ±1.2 nm for all angles. The absorption spectrum of the film should no hysteresis of; spectra taken at 0° and 360° were substantially the same and showed similar behaviors for all rotational angles. The change in the absorbance with the rotational angle of the film affected the dosimetric properties, resulting in rotational variations of the film’s dosimetry in each red-green-blue channel.",
author = "Soah Park and Cheong, {Kwang Ho} and Taejin Hwang and Yoon, {Jai Woong} and Taejin Han and Haeyoung Kim and Lee, {Me Yeon} and Kim, {Kyoung Ju} and Hoonsik Bae and Kang, {Sei Kwon} and Oh, {Seung Jae} and Huh, {Yong Min} and Suh, {Jin Suck}",
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doi = "10.3938/jkps.67.52",
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Park, S, Cheong, KH, Hwang, T, Yoon, JW, Han, T, Kim, H, Lee, MY, Kim, KJ, Bae, H, Kang, SK, Oh, SJ, Huh, YM & Suh, JS 2015, 'Absorption spectrum of gafchromic® EBT2 film with angular rotation', Journal of the Korean Physical Society, vol. 67, no. 1, pp. 52-56. https://doi.org/10.3938/jkps.67.52

Absorption spectrum of gafchromic® EBT2 film with angular rotation. / Park, Soah; Cheong, Kwang Ho; Hwang, Taejin; Yoon, Jai Woong; Han, Taejin; Kim, Haeyoung; Lee, Me Yeon; Kim, Kyoung Ju; Bae, Hoonsik; Kang, Sei Kwon; Oh, Seung Jae; Huh, Yong Min; Suh, Jin Suck.

In: Journal of the Korean Physical Society, Vol. 67, No. 1, 31.07.2015, p. 52-56.

Research output: Contribution to journalArticle

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T1 - Absorption spectrum of gafchromic® EBT2 film with angular rotation

AU - Park, Soah

AU - Cheong, Kwang Ho

AU - Hwang, Taejin

AU - Yoon, Jai Woong

AU - Han, Taejin

AU - Kim, Haeyoung

AU - Lee, Me Yeon

AU - Kim, Kyoung Ju

AU - Bae, Hoonsik

AU - Kang, Sei Kwon

AU - Oh, Seung Jae

AU - Huh, Yong Min

AU - Suh, Jin Suck

PY - 2015/7/31

Y1 - 2015/7/31

N2 - Study of the absorption spectrum in film dosimetry is important because the spectral absorbance of the film is related to the film’s total absorption dose. We investigated the absorption spectra of Gafchromic EBT2 film at various rotational angles in a visible wavelength band. The film was irradiated with 6- MV photon beams for a total dose of 300 cGy. The absorption spectra for different angles of rotation were obtained 24 h after the irradiation and we fitted the spectra by using Lorentzian functions. Two dominant absorption peaks, one at approximately 586 nm (green) and the other at 634 nm (red) were observed. The measured spectrum was decomposed into peaks at 542 nm, 558 nm, 578 nm, 586 nm, 626 nm, 634 nm, and 641 nm. The maximum total area of the red absorption band occurred at 45° (225°) and the minimum at 90° (270°). As the angle of rotation changed, the intensities and integrated areas of the blue and the green peaks also changed with a 180° period, with minima at 90° and 270°, and maxima at 0° and 180°, although the overall absorbance was very low. The spectral peak wavelengths remained constant within ±1.2 nm for all angles. The absorption spectrum of the film should no hysteresis of; spectra taken at 0° and 360° were substantially the same and showed similar behaviors for all rotational angles. The change in the absorbance with the rotational angle of the film affected the dosimetric properties, resulting in rotational variations of the film’s dosimetry in each red-green-blue channel.

AB - Study of the absorption spectrum in film dosimetry is important because the spectral absorbance of the film is related to the film’s total absorption dose. We investigated the absorption spectra of Gafchromic EBT2 film at various rotational angles in a visible wavelength band. The film was irradiated with 6- MV photon beams for a total dose of 300 cGy. The absorption spectra for different angles of rotation were obtained 24 h after the irradiation and we fitted the spectra by using Lorentzian functions. Two dominant absorption peaks, one at approximately 586 nm (green) and the other at 634 nm (red) were observed. The measured spectrum was decomposed into peaks at 542 nm, 558 nm, 578 nm, 586 nm, 626 nm, 634 nm, and 641 nm. The maximum total area of the red absorption band occurred at 45° (225°) and the minimum at 90° (270°). As the angle of rotation changed, the intensities and integrated areas of the blue and the green peaks also changed with a 180° period, with minima at 90° and 270°, and maxima at 0° and 180°, although the overall absorbance was very low. The spectral peak wavelengths remained constant within ±1.2 nm for all angles. The absorption spectrum of the film should no hysteresis of; spectra taken at 0° and 360° were substantially the same and showed similar behaviors for all rotational angles. The change in the absorbance with the rotational angle of the film affected the dosimetric properties, resulting in rotational variations of the film’s dosimetry in each red-green-blue channel.

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