Concentrations of polonium-210, radium-226 and radium-224 were measured radiochemically in extracted teeth obtained from a population in New Hampshire and Vermont, U.S.A. Polonium-210 is indicative of the concentration of lead-210 and radium-224 is taken to be a measure of radium-228. Mean values in teeth were found to be 0.059 pCi/g ash (N = 219) for lead 210, 0.016 pCi/g ash (N = 218) for radium-226 and 0.008 pCi/g ash (N = 55) for radium-228. Differences in the radiogeological character of the two states were not markedly reflected in the skeletal concentrations of the radioelements in the population studied. Only radium-226 was significantly higher in the New Hampshire population. However, there was considerable variability for each of the three radioelements measured in the total sample and skeletal levels of lead-210 in males were significantly higher than those found in females. An estimate of the skeletal dose delivered by the alpha-emitting isotopes and their daughters to bone marrow and osteocytes has been made and polonium-210, the daughter of lead-210, was found to be the major background source of alpha radiation.
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