RESUMO
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.
Assuntos
Esmalte Dentário , Espectroscopia de Ressonância de Spin Eletrônica/estatística & dados numéricos , Guerra Nuclear/estatística & dados numéricos , Monitoramento de Radiação/estatística & dados numéricos , Cinza Radioativa/análise , Radioisótopos/análise , Medição de Risco/métodos , Adulto , Distribuição por Idade , Idoso , Idoso de 80 Anos ou mais , Carga Corporal (Radioterapia) , Espectroscopia de Ressonância de Spin Eletrônica/métodos , Feminino , Humanos , Cazaquistão/epidemiologia , Masculino , Pessoa de Meia-Idade , Doses de Radiação , Monitoramento de Radiação/métodos , Eficiência Biológica Relativa , Fatores de RiscoRESUMO
The method of electron paramagnetic resonance (EPR) dosimetry was applied to the enamel of the teeth extracted from the residents of the Dolon and Bodene settlements of the Beskaragay district, which is the area adjacent to the radioactive fallout of the most contaminating nuclear test of 1949. The individual accidental radiation doses due to the fallout were obtained from the amplitude of the radiation induced EPR signal from the CO2- radical using the calibration method, after determining the parameters of EPR measurements to obtain the best reproducibility of the signal intensities. It was shown that after subtracting the natural background dose from the total absorbed dose obtained by EPR the residents of Dolon and Bodene received accidental radiation doses up to 356 mGy with an average value of 74.1+/-45.5 mGy before 1949 while the younger population received up to about 100 mGy with an average value of 11.5+/-37.7 mGy.
