Abstract
The Task Group on Respiratory Tract Dosimetry Modeling of the National Council on Radiation Protection and Measurement (NCRP) is considering a model on the dose delivered to lung tissues from absorbed or deposited radioactive material. The lung is divided into five dosimetry regions: the pulmonary region, the first five generations of conducting airways in the tracheobronchial (TB) tree, the remaining 11 generations (6 through 16) of conducting airways in the TB tree, the forward-clearing naso-oro-pharyngolaryngeal (NOPL) region, and the backward-clearing NOPL region. The dose from inhaled radioactive materials is calculated for the pulmonary region by assuming a uniform mixture of activity throughout that tissue for the TB regions, given a thin-walled, cylindrical source of uniformly distributed radioactive elements. For the NOPL regions, a thin plate source of uniformly distributed radioactive elements is assumed. Calculations include the application of published functions for dose, as a function of depth, from alpha, beta, and gamma particles.
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