Abstract
Recent radiation protection recommendations place joint constraints on the annual dose equivalent from external irradiation and the annual intake of radionuclides. The inhalation intake of workers acutely exposed to photon emitting radionuclides can be estimated from measurements of activity burdens in the respiratory tract and the time dependence of retention derived from the respiratory clearance model. Functions describing the fraction of the inhaled material retained in the respiratory tract are derived and their application to evaluation of the radiological status of an exposed worker noted.
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