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ESR Property of a Photochromic Titanium Oxide Gel
https://repo.qst.go.jp/records/43994
https://repo.qst.go.jp/records/4399425275b9f-e28d-4d1b-a816-568ed58247f1
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2006-03-13 | |||||
| タイトル | ||||||
| タイトル | ESR Property of a Photochromic Titanium Oxide Gel | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Takami, Michiko
× Takami, Michiko× Yasuda, Hiroshi× 高見 実智己× 保田 浩志 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | There are various high-energy charged particles in space. At aviation altitude (8-12km), aircraft crew and passengers are exposed to secondary cosmic radiations as well as primary particles; the secondary radiations are produced by collision of high-energy cosmic protons with the atmosphere and wall materials of an aircraft. It is thus important to assess their exposure to cosmic radiation in view of radiological protection. Until now, various personal dosimeters have been developed, photoluminescence dosimeters (PLD), thermoluminescence dosimeters (TLD), nuclear track detectors (e.g. CR-39) and electronic dosimeters. However, dosimeters which are suitable for measurement of cosmic radiation are still to be investigated. We have thus tried to design a dosimeter using new materials sensitive to energetic neutrons (0.1MeV-1GeV), i.e. the main components of cosmic radiation. In this work, we discuss the possibility of a photochromic gel of titanium oxide as a personal dosimeter. Titanium oxide is well known as a photocatalyst. Ti3+ is produced by ultraviolet (UV) irradiation of titanium oxide particles and indicates a deep blue color. Therefore, transparent titanium oxide gel will change its color to deep blue following production of Ti3+. If UV irradiation of the titanium gel stops, bleaching occurs; the deep blue coloration gradually disappears as storage time passes and the titanium oxide gel becomes transparent again. The coloration and bleaching are reversible and can be repeated many times. This property of reversible coloration, which is called "photochromism", relates to energy transitions of electrons. Therefore, we considered photochromic titanium oxide gel to be an effective material for a dosimeter, based on the technique of electron spin resonance (ESR). We also expect that the property of photochromism can be used as a real-time monitor by exploiting this colorization. As the first step in the dosimeter development, we investigate ESR signals from a synthesized photochromic titanium oxide gel irradiated with X-rays. From the results, although coloration, as seen for UV radiation, was not observed for X-rays, a hole trap that is ascribable to hydroxyl radical was produced and it was active for ESR. Synthesized titanium oxide gels therefore could be used as an ESR dosimeter for X-ray radiation. | |||||
| 書誌情報 |
Japanese Journal of Health Physics 巻 40, 号 4, p. 385-387, 発行日 2005-12 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0367-6110 | |||||
