SELECTIVE SATURATION METHOD FOR EPR DOSIMETRY WITH TOOTH ENAMEL

The method of selective saturation proposed is based on the difference in the microwave (mw) power dependence of the background and radiatio n induced EPR components of the tooth enamel spectrum. The subtraction of the EPR spectrum recorded at low mw power from that recorded at hi gher mw power provides a considerable reduction of the background comp onent in the spectrum. The resolution of the EPR spectrum could be imp roved 10-fold, however simultaneously the signal-to-noise ratio was fo und to be reduced twice. A detailed comparative study of reference sam ples with known absorbed doses was performed to demonstrate the advant age of the method. The application of the selective saturation method for EPR dosimetry with tooth enamel reduced the lower limit of EPR dos imetry to about 100 mGy.