Electron paramagnetic resonance (EPR) dose reconstruction has been performed on archived tooth samples from residents of two
villages near the Semipalatinsk nuclear test site in Kazakstan. The context of this work is a large multidisciplinary study
of thyroid disease prevalence and radiation dose among long-term residents of villages near that nuclear test site, in which
EPR is used for biodosimetric validation of the gamma-ray component of dose reconstruction algorithms applied to the data
for various villages whose residents were exposed to radioactive fallout during 1949–1962, the period of above-ground atomic
bomb testing. The tooth samples, nine from the village of Kainar and 23 from the village of Znamenka, were extracted in 1964
and 1967, respectively, and stored indoors in closed boxes in Semipalatinsk. According to provided information, some time
in the past, the teeth from Kainar were heated to 80°C for one day. Experiments carried out on 12 teeth from US sources to
determine the effects of long-term storage and heat treatment found that EPR assay findings were not compromised for storage
times less than 35 years and annealing at temperatures below 200°C. For tooth enamel samples prepared from molars and premolars
the average reconstructed gamma dose was 390±70 mGy for Kainar residents and 95±40 mGy for Znamenka residents.
[Show abstract][Hide abstract] ABSTRACT: The dating of fossil teeth of an ancient goat (Nesogoral melonii) using the electron spin resonance (ESR) technique is reported. This animal was found in the fossiliferous site at Orosei (Nuoro, Sardinia, Italy) and was endemic in the region. Molar teeth were cleaned and enamel was completely removed from dentine. Enamel was irradiated with a 60Co gamma source and measured with an ESR spectrometer (X-band) to obtain the signal vs. dose curve and fitted with an exponential function. The archeological dose obtained by the fitting was 211 +/- 34 Gy. Uranium and thorium concentrations were determined by neutron activation analysis. With the software ROSY the age estimates were 195 +/- 30 ky for early uptake, 247 +/- 40 ky for linear uptake and 243 +/- 40 ky for a combination of uptake processes.
[Show abstract][Hide abstract] ABSTRACT: The method of electron paramagnetic resonance (EPR) spectroscopy for tooth enamel is applied to individual radiation dose determination to residents of two villages (Dolon and Mostik) in the vicinity of the Semipalatinsk nuclear test site in Kazakhstan. These villages are located near the central axis of the radioactive fallout trace of the most contaminating surface nuclear test conducted in 1949. It is found that excess doses obtained by subtraction of natural background dose from dose absorbed in enamel range up to 440 mGy to residents of Dolon, whose enamel was formed before 1949, and do not exceed 120 mGy to younger residents. To residents of Mostik, excess doses do not exceed 100 mGy regardless of age except for one resident with an extremely high dose of 1.25 Gy. These results are in agreement with the pattern of radioactive contamination of the territory after the nuclear test of 1949 except one case of extremely high dose, which should be additionally investigated.
Journal of Radiation Research 03/2006; 47 Suppl A(SupplementA):A39-46. DOI:10.1269/jrr.47.A39 · 1.80 Impact Factor
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