ガドリニウムイオン付活のグラセライト結晶のesrイメージングへの応用
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- Material Type
- 記事
- Publication Date
- 1997
- Publication Date (W3CDTF)
- 1997
- Periodical title
- RADIOISOTOPES
- No. or year of volume/issue
- 46 2
- Volume
- 46
- Issue
- 2
- Pages
- 65-71
- Publication date of volume/issue (W3CDTF)
- 1997
- ISSN (Periodical Title)
- 00338303
- Publication (Periodical Title)
- Japan Radioisotope Association
- Text Language Code
- ja
- Target Audience
- 一般
- DOI
- 10.3769/radioisotopes.46.65
- Related Material (URI)
- Data Provider (Database)
- 国立情報学研究所 : CiNii Research
- Original Data Provider (Database)
- Japan Link CenterCrossrefCiNii Articles
- NAID
- 130004127428
- Summary, etc.
- <I>The imperfections and defects are well known to form in the alkaline metal sulfates after X-ray irradiation. The</I> Gd <I>ion-doped</I> K<SUB>3</SUB>Na (SO<SUB>4</SUB>) <SUB>2</SUB> <I>had high susceptibility to X-ray irradiation. The ESR signal of</I> SO<SUB>3</SUB><SUP>-</SUP> <I>radical was isotropic and thermally stable in</I> Gd <I>ion-doped</I> K<SUB>3</SUB>Na (SO<SUB>4</SUB>) <SUB>2</SUB> <I>irradiated by X-ray. The result described is the application of the</I> Gd <I>ion-doped</I> K<SUB>3</SUB>Na (SO<SUB>4</SUB>) <SUB>2</SUB> <I>to the ESR imaging method which can monitor both absorbed dose and irradiation direction. Zupancic-typed coils were used, to produce the magnetic field gradient with a direction for ESR imaging The parallel wires of Zupancic-typed coils were connected to each other and to the current sources, forming four independent current loops to change the direction of magnetic field. The ESR spectra were measured using an X-band ESR spectrometer with a 100 kHz magnetic field modulator and a phase-sensitive detector. The current values of the four loops were controlled by using four regulated DC power supplies controlled by 12 bit D/A converters. A two-dimensional image was reconstructed using a filtered back projection method from the projection data of 180 directions (1-degree steps), which were obtained by using a field gradient of 1.05mT mm</I><SUP>-1</SUP>. <I>The obtained results suggest that the</I> Gd-<I>doped</I> K<SUB>3</SUB>Na (SO<SUB>4</SUB>) <SUB>2</SUB> <I>sample can be utilized as the ESR-CT image and the ESR dosimeter in the range from 20μGy to 100 Gy</I>.被ばく線量の計測と同時に放射線の被ばく方向も判別できる放射線検出方法としてESRイメージング法が, 最近注目されるようになってきた。そこで, 高感度なESR線量計用素子として開発した, 3価で安定なガドリニウムイオンで付活したグラセライト (K<SUB>3</SUB>Na (SO<SUB>4</SUB>) <SUB>2</SUB>) 結晶および磁場勾配方向の調整が可能な自作した装置を用いて, X線照射後におけるESR測定を行った。得られたESR測定データは, 自作した波形処理および画像形成用プログラムを用いて処理することによりESRイメージング画像を作成し, ESRイメージング画像とX線照射に対するX線吸収線量および照射方向性との相関性を調べた<BR>この結果, 20μGyから100Gyまで広範囲のX線吸収線量にわたって, ESRイメージング画像におけるスピン濃度分布は, X線の照射方向と対応しており, X線吸収線量とほぼ比例関係にあることがわかった。
- DOI
- 10.3769/radioisotopes.46.65
- Access Restrictions
- インターネット公開
- Data Provider (Database)
- 科学技術振興機構 : J-STAGE