638 



ADVENTURES IN RADIOISOTOPE RESEARCH 



Table 2 



Total liver iron 



Total non-extractable liver nuclear heamoglobin iron . . 



Total liver activity in % of that injected 



Total non-extractable liver nuclear haemoglobin activity 

 in % of that injected 



Both the iron content of the nuclear fraction and its specific activity- 

 is much higher in the foetus than in the mother. 



Three of the pregnant rabbits were exposed 1 day prior to injecting 

 them with ^^Fe to an X-ray dose of 500 r. The effect of the radiation on 

 the incorporation of ^^Fe into the liver nuclear fraction is discussed in 

 a paper by Ehrenstein et alS^^^ 



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