TRITIUM MEASUREMENT TECHNIQUES - NCRP REPORT No.125

The development of a respiratory tract model which accurately reflects reality is a difficult and complicated effort. This stems largely from the variety of airway shapes, airflow patterns, and cell types having different radiosensitivities. Anatomic and physiologic alterations in smokers or those exposed to chemicals, among others, further complicate modeling. In spite of the inherent difficulties, the continuing pursuit of a model that mimics actual conditions has been considered to be important by those involved in radiation protection....