Journal of Medical Physics
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Year : 2017  |  Volume : 42  |  Issue : 2  |  Page : 86-89

Intensities of incident and transmitted ultraviolet-a rays through gafchromic films

1 Faculty of Health Sciences, Butsuryo College of Osaka, Osaka, Japan
2 Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan
3 Faculty of Health Sciences, Junshin Gakuen University, Fukuoka, Japan
4 Department of Radiological Technology, Tokushima Red Cross Hospital, Komatsushima, Japan
5 Graduate School of Health Sciences, Okayama University, Okayama, Japan
6 Graduate School of Medicine, The University of Tokyo, Tokyo, Japan

Correspondence Address:
Toshizo Katsuda
Faculty of Health Sciences, Butsuryo College of Osaka, 3-33, Otorikita-machi Nishi-ku, Sakai-city, Osaka, 593-8328
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmp.JMP_136_16

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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/cm2. 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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