Evaluation of corrective methods of measurement of accidental irradiation dose using in vivo ESR

• Project/Area Number: 21791824
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Pathobiological dentistry/Dental radiology
• Research Institution: Kagawa University
• Principal Investigator: IWASAKI Akinori Kagawa University, 医学部附属病院, 助教 (10437676)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2009: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: ESR / 放射線 / 被曝線量測定 / 歯エナメル質 / ESR信号 / スクリーニング法 / 検出感度 / トリアージ / 既存ESR信号 / L-band / 共振器 / 生成効率

Research Abstract

The measurement of ESR background signals from human isolated teeth using L-band ESR spectrometer was carried out. The average of the ESR signal intensity was 0.017014±0.011049 a.u. (arbitrary units). The histogram analysis revealed that the distribution of the background signals obeyed a log-normal distribution. We confirmed that the serial irradiation by a diagnostic dental X-ray imager generates detectable ESR signals by L-band ESR spectrometer. It is suggested that medical exposures e.g. diagnostic dental X-ray imager mainly generate ESR background signal in human teeth. The addition of certain signal intensity seems to be acceptable procedure as a correction method.