580 



C. S. BACHOFER 



<J 0.8 



0.6 



0.4 



0.2 



Beginning of Beginning of 



Stimulation X- irradiation 



at lOO/sec 



\ 



-o Spike Amplitude 

 ■^ Sensitivity 

 • Conduction Velocity 



\ 



o 



\ 



20 



20 40 



tVIINUTES 



60 



80 



Fig. 4. Mean relative responses of 10 caudal nerves stimulated as in Fig. 3, except 

 at 100 per sec. Higher frequency of stimulation reduced enhancement of spike ampli- 

 tude, but had less effect on other factors. Dose rate: 6 kr per min. 



made. Spike amplitude, which was in the rising phase of enhancement due 

 to x-irradiation, continued to increase; sensitivity and conduction velocity, 

 which were in the falling phase, having passed the peak of enhancement, 

 continued to decrease. 



X-irradiation of rat caudal nerves in situ. This phase of the research was 

 undertaken to determine whether the effects observed in nerves irradiated 

 ill vitro miafht be attributed to the artificial environment in which the nerve 



