Human application of in vivo EPR Dosimetry

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The measuring device for the radiation exposure dose in human teeth enamel using L-band in vivo Electron Paramagnetic Resonace (EPR) was newly developed. The loop-resonator designed for human upper central incisor were specially made, the S / N ratio with this new resonator, it was improved of 2.7 times that of the conventional apparatus. 95.0% sensitivity and 90.0% specificity in 1Gy irradiated specimen as the detection sensitivity were achieved. Further, the structure of the measuring setting was modified which can be measured in a sitting position, it can be reduced the measurement noise due to moving of the subjects. The measurement from 35 volunteers was performed, and the data of the background EPR signals in existing in enamel were obtained.