20 



1.5 



Q 



< 



UJ 

 CO 



O 

 Q 



z 



< 



cc 

 O 



_i 

 < 

 u 



H 

 DC 

 U 



Q 



LU 



CO 



LU 



1.0 



0.5 



ICRP-recommended dose limit 



7 



V/ 



I 



*Z 



a 



i 



I 



1 



i 



M 





I 



^ 



1959 60 61 



62 63 



64 65 66 67 68 69 70 71 



Figure 1 . Radiation exposure from consumption of laverbread Radiation exposure of 

 the Gl tract lower large intestine from the consumption of laverbread at 

 160 g/d Unshaded blocks-dose-rate based on laverbread manufactured 

 from contaminated weed only; shaded blocks-dose-rate on laverbread 

 manufactured from contaminated weed diluted by the addition of clean 

 weed. (Preston and Mitchell, 1973) 



