INITIAL RADIATION DAMAGE AT SITU-CELLULAR LEVEL 



Fig. 3. — Similar cells 42 hr after 300 rads of X-rays. About 10 per cent of the cells turn 

 into giants and an example of these is seen in the centre. The majority of the cells only 

 double in volume (i.e. diameter increased by less than 30 per cent) and two of these are 



shown at the top. 



