UV intensity of pre-irradiation in gafchromic XR-RV3 and XR-SP2

Tadao Kuwano, Y. Takeda, T. Katsuda, R. Gotanda, T. Gotanda, T. Akagawa, N. Tanki, A. Noguchi, Y. Kawaji, K. Yamamoto, K. Yabunaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

UV-A irradiation of Gafchromic XR-RV3 and XR-SP2 are considered to be a substitute for X-ray irradiation in the double irradiation of Gafchromic XR-RV3 and XR-SP2. It makes it possible to compensate for heterogeneity errors in the active layers of Gafchromic XR-RV3 and XR-SP2. UV-A with a wavelength of 395-nm was irradiated to Gafchromic XR-RV3 and XR-SP2, and irradiation time and color density change were investigated. At first, Gafchromic XR-RV3 and XR-SP2 were pre-irradiated for 2 and 4 hours, respectively, by UV-A with a wavelength of 365-nm, with UV-A fluorescent lamp as the radiation source, located at a distance of 72 cm. Secondly, a UV-A light emitting diode (LED) capable of generating 395-nm UV-A was used. The irradiation times of UV-A for Gafchromic XR-RV3 and XR-SP2 were from 5 to 120 minutes and from 30 to 300 minutes at a distance of 5.0 cm, respectively. From these results, appropriate irradiation time was considered. A 0.5 inchs diameter region of interest was set for each irradiation area, and a histogram of pixel values was obtained. The selected condition was two items "There is not 0 in a mode", "A 1/10 level intersects both sleeves of graph". When Gafchromic XR-RV3 and XR-SP2 were irradiated with ultraviolet rays of wavelength 395 nm as an X-ray substitute for double irradiation technology, it was proved that 60 minutes (5511.00 mJ/cm2) and 270 minutes (24799.50 mJ/ cm2) were sufficient for irradiation time respectively. And both distance was 5cm.

Original languageEnglish
Title of host publicationEMBEC and NBC 2017 - Joint Conference of the European Medical and Biological Engineering Conference EMBEC 2017 and the Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2017
EditorsHannu Eskola, Outi Vaisanen, Jari Viik, Jari Hyttinen
PublisherSpringer Verlag
Pages53-56
Number of pages4
ISBN (Print)9789811051210
DOIs
Publication statusPublished - 2017
EventJoint Conference of the European Medical and Biological Engineering Conference, EMBEC 2017 and Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2107 - Tampere, Finland
Duration: Jun 11 2017Jun 15 2017

Publication series

NameIFMBE Proceedings
Volume65
ISSN (Print)1680-0737

Other

OtherJoint Conference of the European Medical and Biological Engineering Conference, EMBEC 2017 and Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2107
CountryFinland
CityTampere
Period6/11/176/15/17

Keywords

  • Computed tomography
  • Gafchromic film
  • Nonuniformity
  • Radiation measurement
  • Ultraviolet rays

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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  • Cite this

    Kuwano, T., Takeda, Y., Katsuda, T., Gotanda, R., Gotanda, T., Akagawa, T., Tanki, N., Noguchi, A., Kawaji, Y., Yamamoto, K., & Yabunaka, K. (2017). UV intensity of pre-irradiation in gafchromic XR-RV3 and XR-SP2. In H. Eskola, O. Vaisanen, J. Viik, & J. Hyttinen (Eds.), EMBEC and NBC 2017 - Joint Conference of the European Medical and Biological Engineering Conference EMBEC 2017 and the Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, NBC 2017 (pp. 53-56). (IFMBE Proceedings; Vol. 65). Springer Verlag. https://doi.org/10.1007/978-981-10-5122-7_14