20 



NEUTRON EFFECTS ON ANIMALS 



Fridays, the M W F side was placed uppermost while on Tuesdays, Thurs- 

 days and Saturdays, the other side was turned upward. Since the handle 

 was always turned toward the rear, the animals faced alternately east and 

 west. 



Rats were placed in copper boxes, each of which held twelve individuals. 

 These boxes measured 9|" x 2f " x 24^" on the outside, and each rat had a 

 space of 2f " x 2f " x 8f ". The boxes were ventilated front and rear. 



Fig. 3. Irradiation procedure 



Mice were irradiated in cage 7. They were placed in two rat boxes, 15 

 mice per box. The boxes were located one above the other. 



The lead cylinders used in corn irradiation were placed in position 8. 

 Bacteria were irradiated in the same general region. 



NEUTRON ENERGY 



The deuteron beam energy was 9.5 million electron volts. The beam 

 direction is indicated by the arrow in Fig. 1 . The neutrons were produced 

 by the reaction 



Be^ + H' -- B'o + N«. 



