494 TRANSURANIC ELEMENTS IN THE ENVIRONMENT 



TABLE 8 Parameter Values Applicable to the ICRP 11 Model 

 for Transuranic Elements Other than Plutonium* 



Element 

 Neptunium Americium Curium Berkelium Californium 



Biological Half -Time, days 



120 



65,000 



120 



65,000 



0.80 



0.80 



*A11 other parameter values are identical to those of plutonium. 



On the basis of Fig. 4, the equations for the compartments of the respiratory tract 

 and lymph nodes plus the transfer to the GIT and blood are 



rciT - ^bYNPb "•■ ^dVTBd "^ VVPf + ^YPg + ^ 



m 



(42) 



fB - ^aYNPa + ^^cYTBe + ^eYPg + ^iYLM; + tjrCIT 



dyNp, 



—^ = faD3 Am - (Xa + Xa) YNP^ 



^ = fbD3A,^-(XA+Xb)YNPb 



dt 



dyiBc 



dt 



YNP - YNPa + YNPb 



fc D4A„i -(Xa +Xc)ytBc 



^^=fdD4An,-(XA + Xd)YTBd 



YTBf,g = (XfYPj. + Xgypg) TjBf,^ 



YTB = YTBc ■'' YTBj + YTBf^g 

 dYP, 



dt 



= feD5Am -(Xa + Xe)yp, 



(43) 



(44) 

 (45) 

 (46) 

 (47) 



(48) 



(49) 

 (50) 

 (51) 



