Electron Spin Resonance (ESR) Dosimetry of Human Tooth Enamel of Low Dose Region Using a Numerical Method with Matrices
S. Toyoda, H. Tanizawa, E. Tieliweuhan, M. Hoshi, C. Miyazawa, A. A. Romanyukha
Electron Spin Resonance (ESR) is one of the most important methods for retrospective radiation dosimetry. We employed in the present paper a numerical method using matrices to separate the ESR signal useful for dosimetry and the background organic signal from the spectrum observed in human tooth enamel and dentin. The effects of the mechanical separation of enamel and dentin and of chemical treatment were examined using the present technique. Very good dose responses were obtained for all enamel and a dentin samples while one group have intercepts which are not negligible. These are probably due to dental X-ray doses. The chemical treatment using potassium hydroxide (KOH) was effective to reduce the intensity of the organic signals especially for dentin sample. It would be possible to obtain radiation doses not only from enamel but also from dentin although the dose response of KOH treated dentin showed saturation.
This abstract was presented at the 36th Annual Midyear Meeting, "Radiation Safety Aspects of Homeland Security and Emergency Response", Poster Session, 1/26/2003 - 1/29/2003, held in San Antonio, TX.