720 



ARTHUR J. RIOPELLE 



tivity of the brain to the direct and indirect effects of radiation would be 

 established, thereby permitting quantitative studies of sensitivity. 



Chimpanzees 



Method 



Chimpanzees to be irradiated were driven by truck from Orange Park, 

 Florida, to the University of Tennessee Agricultural Experiment Station at 

 Oak Ridge, Tennessee, where they were given 375-400 r of gamma radiation 

 from the Co''° facility. Approximately 12 hours were required for irradiation. 

 The animals were then returned to their home cages. During the 51 hours 

 away from the laboratories, they lived in transport cages approximately 2 J/2 

 ft high, 2 ft wide, and 3 ft long. 



Table I shows pertinent facts about the animals and the irradiation. Be- 

 cause of the sequence of irradiation, the animals were not all given identical 

 tests. However, in April, 1959, the irradiated animals were assembled in a 

 single group to compare their performances with appropriate controls. All 

 have been tested continuously since then. 



TABLE I 



Summary of Irradiation 



