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Human tooth dosimetry for gamma-rays and dental x-rays using ESR
T Shimano1, M Iwasaki, C Miyazawa
1Department of Dental Radiology, Tohoku Dental University, Koriyama, Japan.
International Journal of Radiation Applications and Instrumentation. Part A, Applied Radiation and Isotopes
|January 1, 1989
Summary
Secondary electron equilibrium significantly impacts electron spin resonance (ESR) dosimetry for dental x-rays and gamma irradiation. Acrylic plates simulating human tissue reveal distinct ESR signals on tooth surfaces, with build-up effects more pronounced at the front.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Biomaterials
Background:
- Secondary electron equilibrium (SEE) is crucial for accurate dosimetry.
- Simulating human soft tissue is essential for understanding radiation interactions.
- Dental x-rays and gamma irradiation pose unique dosimetry challenges.
Purpose of the Study:
- To investigate the influence of SEE on ESR dosimetry.
- To evaluate radiation build-up effects in simulated oral tissue.
- To differentiate ESR signal patterns on anterior vs. posterior tooth surfaces.
Main Methods:
- Utilized acrylic plates to model human oral soft tissue.
- Employed electron spin resonance (ESR) dosimetry techniques.
- Analyzed ESR signal variations under x-ray and gamma irradiation.
Main Results:
- Dental x-rays produced distinct ESR signal patterns on the front and back tooth surfaces.
- Radiation build-up effects from acrylic plates were significant at the front surface for gamma irradiation.
- Build-up effects were negligible at the back surface for gamma irradiation.
Conclusions:
- SEE plays a critical role in ESR dosimetry accuracy for dental applications.
- Acrylic phantom studies highlight surface-dependent dosimetry variations.
- Dosimetric strategies must account for radiation build-up in oral environments.