Compartmentalized deposition fraction

Compartmental deposition fractions of a 1 pm AMAD aerosol, their distributions and characteristics have been determined as functions of age, gender and breathing pattern (Table 27.2 and Harvey, 2003) and are shown to follow similar trends (Harvey, 2003). 

Respiratory Tract Clearance. This portion of the model identifies the principal clearance pathways within the respiratory tract. The model was developed to predict the retention of various radioactive materials. Figure 3-4 presents the compartmental model and is linked to the deposition model (see Figure 3-2) and to reference values presented in Table 3-5. This table provides clearance rates, expressed as a fraction per day and also as half-time (Part A), and deposition fractions (Part B) for each compartment for insoluble... 

Fig. 5.22. Respiratory tract clearance model used in calculating dose from inhaled radioactivity. Code A series of computer programs to perform dosimetric calculations for the ICRP Committee. The values for the removal half-times, T , j, and compartmental fractions, Fa-j> sf given in the tabular portion of the figure for each of the three classes of retained materials. The values given forDN-P, T-B snd Dp (left column) are the regional depositions based on an aerosol with an AMAD of 1 pm. The schematic drawing identifies the various clearance pathways in the model, a-j, in relation to the depositions Z>n-P. Dp and the three respiratory tract regions, N-P, T-B...

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