137 



of primary events, 13 

 of secondary events, 13 



Enzymes 



adaptation affected by irradia- 

 tion, 117 



ionization of dry preparations, 

 42 



radiation induced inactivation 

 by low voltage electrons, 6 

 radiation induced inactivation 

 in vivo and in vitro, 107 

 radiation induced inactivation 

 of components, 1 14 



Ether- isopent ane - ethanol 



radical formation by photo- 

 oxidation, 83 



Excitation energy 



distribution of levels in mole- 

 cules, 94 



Fano's approximate theory of 

 W, 4 



Fast particle 



energy transfer to matter, 1 



Fermi effect, 2 



Fluorescence 



following electronic excita- 

 tion, 75 



speed of internal conversion, 

 ,.78 



Forster's theory 



self- quenching phenomenon, 85 

 time required for energy 

 transfer from prophyrin to 

 protein in photochemical split 

 of co- myoglobin complex, 88 



Forward reaction 



calculation of radical fraction 

 in irradiated water, 60 

 ionization of water, 57 



Franck-Condon principle, 29, 78 



Franck-Rabinowitch effect, 19 



Gamma radiation 



absorption coefficients, 3, 18 

 diffusion and attenuation of 

 beams, 3 



efficiency of scintillation 

 counter, 89 



energy yields of light induced 

 in anthracene crystals, 8 3 

 H^O^ formation in ice influ- 

 enced by temperature, 47 

 induction of blue color in 

 cotton and Kleenex, 46 

 ionization of ice, 43 



ionization of water, 57 

 penetration and diffusion in 

 large masses, 18 

 radical formation, 62 



Gases 



total ionization sensitivity re- 

 lated to impurties, 4 



Gaussian distribution 



formation of OH and H in ion- 

 ized water, 57, 61, 70 



Generator 



Lauritsens' electrostatic, 3 



Glycerol 



effects of low temperature on 

 radical formation, 72 



Guanine 



ratio to cytosine in DNA, 120 



Heat 



inactivation of biological ma- 

 terial, 8 



Heavy metal complex 



excitation in cell to form ra- 

 dicals, 83 



Helium ions 



capture and loss of orbital 

 electrons, 3 



Homopolar moment 



molecular excitation by slow 

 electrons, 23, 24 



Hydrocarbons 



quantum yield of lowest triplet 

 state, 116 



Hydrogen iodide 



chemical effects of irradia- 

 tion, 7 3 



Hydrogen ions 



capture and loss of orbital 

 electrons , 3 

 energy loss in gas at low 

 pressure, 3 



mobility conformation to di- 

 electric time, 3 1 



Hydrogen peroxide 



importance in producing 

 biologic effects, 105 



Ice 



dielectric properties, 43 

 influence of temperature on 

 H^O^ formation following gam- 

 ma, beta and X rays, 47 

 ionization by gamma radiation, 

 43 



Infrared 



effects on molecular bonds, 8 



