MODEL FOR ESTIMATING Pu TRANSPORT AND DOSE 497 



ICRP II model. The equations for GIT, liver, kidney, bone, and total body are identical to 

 the ICRP II model and have identical parameter values except for the following values, 

 which apply to all transuranic elements: fsL = 0.45, feBN ~ 0.45, tl = 40 yr, and tb = 

 100 yr. 



Stuart, Dionnc, and Bair (SDB) Model 



Stuart, Dionne, and Bair (1968) developed models to describe the distribution and 

 retention of plutonium in the body following a single inhalation. These models were 

 based on the results of several studies with dogs, and these results were extrapolated to 

 where they miglit apply to man. Tlie short-term model is shown in Fig. 5, and the 

 long-term form is shown in Fig. 6. Stuart, Dionne, and Bair (1971) revised the long-term 

 model, and these revisions are incorporated in Fig. 6. Stuart et al. (1971) combined the 

 nasopharyngeal and tracheobronchial regions of the Task Group model into one 

 compartment but expanded the pulmonary region into two compartments, one with a 

 constant biological half-time of 3 yr and another with a variable half-time. 



They also added compartments for abdominal lymph nodes and treated the transfers 

 from the pulmonary region to lymph nodes in a slightly different manner than the Task 



70% OF TOTAL DEPOSITED 



SKELETON -^ 



25% 



UPPER LARGE 



INTESTINE 

 (13-hr TRANSIT) 



KIDNEYS 



2% 



1 00% 



-i_ 



URINE 



2% 



LOWER LARGE 



INTESTINE 

 (24-hr TRANSIT) 



LIVER 



71% 



Fig. 5 Block diagram of the short-term form of the Stuart, Dionne, and Bair (SDB) 

 model. 



