PRINCIPLES OF RADIOLOGICAL PHYSICS 



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ULTRAVIOLET DOSE, arbitrary units 

 Fig. 1-79. Attempt at a precise determination of the low-dose portion of an E. coli 

 survival curve. {Courtesy A. Hollaender.) 



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 Fig. 1-80. Dose-effect curves for the production of genetic mutations, sex-linked 

 lethals in Drosophila. {TimoJ^eff-Ressovsky and Zimmer, 1947.) 



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