2016 Fiscal Year Final Research Report
Improvement of uniformity of Gafchromic films
| Project/Area Number |
26460740
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Medical Physics and Radiological Technology
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| Research Institution | Osaka Butsuryo University (2016)
Tokai Gakuin University (2014-2015) |
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Principal Investigator |
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| Research Collaborator |
Kuwano Tadao 岡山大学, 大学院 保健学研究科
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 放射線技術 / 医学物理 / 線量計測 / Gafchromic film / 均一性 |
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| Outline of Final Research Achievements |
Ultraviolet (UV) rays strength of Gafchromic EBT2 (EBT2) were investigated. It has previously been suggested that UV rays can be used as a substitute for the X-ray double-exposure technique to correct non-uniformity errors when using EBT2. Ultra violet-A rays having a wavelength of 375 nm was used to irradiate Gafchromic EBT2 for various time durations, and the resulting density change was investigated. A UV light-emitting diode that generates UV-A of 375 nm was used to irradiate the EBT2 film with varying durations of 1 to 30 min. A circular region of interest of 0.5 inches diameter was set by the irradiation area, and a histogram of pixel values was created. The choice of conditions was decided based on two important requirements: first, there is no zero values mode and seconds, the 1/10 level intersects both axes of the graph. In the case of Gafchromic EBT2, the irradiation dose was 170.86 mJ/cm2 for 2 min, with a pixel value of mean 573.47 ± 251.43.
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| Free Research Field |
医歯薬学
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