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Stochastic lung dosimetry model IDEAL-DOSE considers deposition in the whole bronchial and alveolar airway system, while clearance was restricted to bronchial airways.
For inhaled long-lived radionuclides, alveolar clearance has also to be considered for the calculations of alveolar as well as the bronchial doses from subsequently cleared particles to the bronchial region.
The ICRP task group on internal dosimetry is developing new Occupational Intake of Radionuclide (OIR) and in connection to OIR Human Respiratory Tract Model (HRTM) will be updated on the basis of new information and experience.
The main consideration for updating the HRTM are two clearance mechanisms including:
blood absorption from different regions of the lung
Proposed particle transport rates for updating clearance model is incoporated in IDAEL-DOSE for estimating lung doses from LLR.