-The effect of the crushing and additive dose procedures used in EPR dosimeuy of enamel was studied on the signals with g-factors of 2.0045 and gl = 2.0018, g, = 1.9975. Eight~tions,~g~g fi size from <75 micrometers to 2 mm, were prepared from one tooth. Two cases wem investigated: crushing of a non-irradiated sample and of a sample previously irradiated (6 Gy tinm Wo gamma ray source). In the non-imadiated study, the intensity of the native signal at 2.0045 inaeased by circa 1.75 times as the grain size &cmased from maximum to minimum. A small decrease in radiation sensitivity (< 8%) was also observed with decreasing grain size. In the irradiated samples, crushing resulted in slight variations of reconstructed doses from expecmd values, but the worst possible case (grain sizes c 75 pm) showed that additional errors were less than 10%.The radiation sensitivity of enamel measumd immediately atter exposure is underestimated. It increases by about 15% in the fmt month. Based on the decomposition of the observed specq a new interpretation of transient signals is proposed which explains the above phenomena. Recommendations about how to use this interpretation in retrospective EPR dosimetry are given.
-The f~st two signals correspond to the components of the radiation induced signal third signal corresponds to the native signal reported in dosimetry and datingThe remaining two signals were found to be stable and sensitive to both gamma and sunlight exposure. Their sensitivity response to light and radiation was considerably different which gives rise to the possibility that the g = 2.0052 and g = 2.0083 signals might be used as indicators of the dose resulting from light exposure.
-The effect of the crushing and additive dose procedures used in EPR dosimeuy of enamel was studied on the signals with g-factors of 2.0045 and gl = 2.0018, g, = 1.9975. Eight~tions,~g~g fi size from <75 micrometers to 2 mm, were prepared from one tooth. Two cases wem investigated: crushing of a non-irradiated sample and of a sample previously irradiated (6 Gy tinm Wo gamma ray source). In the non-imadiated study, the intensity of the native signal at 2.0045 inaeased by circa 1.75 times as the grain size &cmased from maximum to minimum. A small decrease in radiation sensitivity (< 8%) was also observed with decreasing grain size. In the irradiated samples, crushing resulted in slight variations of reconstructed doses from expecmd values, but the worst possible case (grain sizes c 75 pm) showed that additional errors were less than 10%.The radiation sensitivity of enamel measumd immediately atter exposure is underestimated. It increases by about 15% in the fmt month. Based on the decomposition of the observed specq a new interpretation of transient signals is proposed which explains the above phenomena. Recommendations about how to use this interpretation in retrospective EPR dosimetry are given.
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