MODEL FOR ESTIMATING Pn TRANSPORT AND DOSE 495 



Q 

 O 

 O 



_i 



CD 



lU) 



I 

 L 



(a) 



(c) 



o . <> 



NP3 



faDsAm 



NP. 



ffaDsAm 



(b) 



NASOPHARYNGEAL REGION 



D4" 



fcD4Am 



<ZL 



TBd 

 ^dDaAm,"" 



TRACHEOBRONCHIAL 



REGION 



(e) 



3z: 



3z: 



feDsAr 



^DsAm 

 (h) 



3ZL 



(f) 



ffDgA^ 



3z: 



(d) 



(9) 



fgDsAr 



(i) 



f ''^ PU LMONARY REGfON 



LMi [ LMf 



LYMPH 



o 

 < 

 cc 



o 



< 



Fig. 4 Schematic diagram of the Task Group on Lung Dynamics model. [From 

 Houston, Strenge, and Watson (1975).] 



^ = ffD5Ani-(XA + Xf)ypf 



(52) 



dyp 



i = f„D5An,-(XA + X„)yp 



dt ^ 



g/J'i'g 



(53) 



^ = fhD5Am-(XA + Xh)yPh 



yp = ype + ypf + ypg + yph 



dyLM- 



— ^= fiXhypj^ - (Xa + Xi) yLMi 



(54) 

 (55) 

 (56) 



