An EPR intercomparison using teeth irradiated prior to crushing

An intercomparison of methods used for EPR dosimetry of enamel was made by the Center for Applied Dosimetry at the University of Utah and the Scientific Center for Radiation Medicine in the Ukraine (SCRM). The Utah group used the differential microwave power technique while the Ukrainian group employed a system of chemical preparation combined with a technique of subtraction of standard background signals. Because of time constraints, the results were reported before each laboratory had performed detailed background analyses. These results showed that both methods were in good agreement with the applied dose. Subsequent to this, the Utah group continued work on refining the differential power technique while SCRM investigated the differences between the inner and outer portions of the teeth. It was determined that the contribution of dental X-rays to the total dose was between 20 and 140 mGy. (C) 1997 Elsevier Science Ltd.