52 



RADIATION lfI()L(JGY 



0.000 001 



0.001 0.01 0.1 I 10 100 1,000 



EXPOSURE TIME, min 



100,000 



I U II 



1,000 



7 hr 



I hr 



EXPOSURE TIME, min 

 Fifi. 2-7. Reciprocity of tiinc and intensity for various exposures and the kill of typical 

 inioroorganisius. 



