Abstract
A four-compartment mammillary model for the distribution and excretion of thorium and its daughter radium is studied and applied to the problem of estimating the radiation dose to organs and tissues of man for the case of a single intake of232Th. The long-lived daughter228Ra (∼6 y) grows in with time and gives birth to the other short-lived daughters (<0.4 day) which irradiate those tissues in the vicinity of their point of production. Some data on228Th and its daughter224Ra are available on dogs from which a model is derived and tested. Then, from some single-intake data (Th and Ra) on man, parameters for the model are estimated and estimates of residence times of the232Th daughters in man are made. Also, the 50-year radiation dose (dose equivalent) to bone from a single intake of232Th is estimated.
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