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[A problem with ESR dosimetry utilizing human tooth enamel in low dose region]
M Iwasaki1, C Miyazawa, T Shimano
1Department of Dental Radiology, Ohu University School of Dentistry.
Ou Daigaku Shigakushi
|November 1, 1990
Summary
This study found a linear relationship between radiation dose and the carbonate radical (CO3(3-)) signal intensity in human tooth enamel at doses above 25.0 x 10(-4) C/kg. Lower doses were affected by noise, making linearity difficult to confirm.
Area of Science:
- Geochemistry
- Materials Science
- Radiation Dosimetry
Context:
- Human tooth enamel is a potential dosimeter for radiation exposure.
- Electron Spin Resonance (ESR) spectroscopy can detect radiation-induced defects in enamel.
- The carbonate radical (CO3(3-)) signal is a key marker in ESR analysis of irradiated enamel.
Purpose:
- To investigate the dose-response linearity of the CO3(3-) signal in human tooth enamel.
- To determine the lower limit of reliable CO3(3-) signal detection for radiation dosimetry.
- To assess the feasibility of using tooth enamel for low-dose radiation measurements.
Summary:
- Human tooth enamel samples were irradiated with 60Co gamma rays across a low dose range (3.1-865.6 x 10(-4) C/kg).
- ESR measurements revealed a linear correlation between CO3(3-) signal intensity and radiation dose from 25.0 to 865.6 x 10(-4) C/kg.
- The presence of organic signals and noise obscured linearity below 25.0 x 10(-4) C/kg.
Impact:
- Establishes the effective dose range for CO3(3-) signal dosimetry in tooth enamel.
- Highlights limitations in using tooth enamel for very low radiation dose assessment.
- Provides foundational data for developing enamel-based retrospective dosimetry techniques.