EFFECTS OF LOW X-EAY DOSES 



19 



output, measured in air with a Victoreen Radocon, was 47 r/min. The rats 

 were irradiated in fours on a turntable. When we administered 1 r or 0-1 r, 

 the distance was 1-20 m and 3-2 m and the irradiation time 2"9 and 1"9 

 respectively. 



Table I. Experimental conditions and LDgp^^Q^ 



Table II. Experimental conditions and LD^q^^q. 



Conditioning dose 



Number of xn 



Dose 

 rats 



Interval between 



conditioning dose and 



sublethal dose 



(days) 



Sublethal dose 



Number of 

 rats 



Dose 



Percentage mortality 



30 days after sublethal 



dose 



The condition of all the rats was recorded daily until 30 days after the 

 sublethal exposure. 



