Radiation Color Dosimeter with Ultrahigh Radiation Sensitivity
| Project/Area Number |
15550139
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental chemistry
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
IRIE Setsuko Osaka Prefecture University, Research Institute for Advanced Science and Technology, Associate Professor, 先端科学研究所, 助教授 (90100180)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Diarylethene / Color Dosimeter / Radiation Sensitivity |
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| Research Abstract |
The radiation sensitivity of photochromic diarylethenes was studied with the aim to develop a high sensitive color dosimeter. We reported on a color plastic dosimeter based on the radiation-induced coloration of photochromic diarylethenes. The coloration is due to the radiation-induced excitation of diarylethenes. The reason why diarylethenes can be used as a dosimeter is that the colored isomers are thermally stable and never return to colorless isomers in the dark.
The radiation-induced coloration of bulk amorphous films of five photochromic diarylethenes was studied with the aim of developing reusable, sensitive color dosimeters. The films contain an extremely high concentration of diarylethenes. The most intense coloration was observed for the film containing 1,2-bis(2,4-dimethyl-3-thienyl)perfluorocyclopentene having 3-phenyl-4-diphenylyl substituents. The color disappeared upon irradiation with visible light. The coloration increased linearly with an increase in the absorbed dose up to 3000 Gy. The relative sensitivity of radiation-induced coloration among the five derivatives qualitatively agreed with the sensitivity of photo-induced coloration from UV light(254 nm) irradiation. Photochromic color dosimeters can be reused, because the radiation-induced color can be erased by visible light irradiation. For the practical application it is necessary to know how many times the film can be reused. The film could be reused after bleaching the color with visible light(λ>450 nm). The color was stable in the dark, but disappeared upon irradiation with visible light. The sensitivity remained at 80 % of the initial value eyen after 10 cycles.
We examined the effect of fluorescent metal complexes on the radiation-induced coloration of diarylethenes. Even if the absorbed dose was as small as 5 Gy, a clear colour change was observed in polystyrene films(the content of 1:10 wt% and BaFCl;Eu.:60 wt%, the film thickness : ca 0.5 mm) irradiated with X-rays.
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Report
(3 results)
Research Products
(8 results)
