140 



proportional counter, 48 



high energy, 1, 2 



spatial distribution in water, 



54 



stopping power of low energy, 



3 

 Purines 



localization of radiation damage, 



114, 115 



ratio of pyrimidine in nucleic 



acid, 120 

 Pyrimidines 



localization of irradiation, 



damage, 114, 115 



ratio to purine in nucleic 



acid, 120 



Quantum yield 



for lowest triplet state, 116 

 of aromatic hydrocarbons, 116 



•i 



Radiation 



additive effects on apoenzyme 

 and prosthetic groups, 113, 114 

 chemical changes in water, 57, 

 58 



effects on enzymatic adaptation 

 116, 117 



effects on hydrogen iodide, 73 

 effects on interfaces or surface 

 film, 110 



enzyme inactivation in vivo and 

 in vitro, 107 



free radicals and trapped 

 charges at low temperature, 72 

 induction of chemical effects in 

 biologic material, 103 

 localization of damage, 113, 

 114, 116, 117 



lowest emission level in com- 

 plex molecule, 97, 98 

 measurement of dosage, 102 

 measurement of penetration, 

 2, 4 



mechanism of interaction with 

 biological material, 103 

 recombinations in scintillating 

 solutions, 16 

 recombinations in water, 16 



Radiation decomposition 



protection of aliphatic mole- 

 cules by aromatic molecules, 

 91, 92 



Radical formation 



in cell by excitation of heavy 



metal complex, 82 



in organic molecules by photo- 



oxidation, 82 



Radicals 



calculation of fraction in ir- 

 radiated water, 60, 68, 69 

 F and R reactions in irradiated 

 water, 60 



formed by primary energy- 

 transfers, 66, 67 

 importance in radiobiologic 

 research, 69 

 ionization of water, 67 

 movement in water, 60 

 proportion in tritium water, 63 

 proportion in irradiated water, 

 62 



production of radiobiologic ef- 

 fects, 104, 105 



reaction rates and diffusion co- 

 efficients, 60 

 recombination yield for H 

 Beta rays and Po gamma rays 

 117, 118, 119 



Radiobiologic effect 

 latent time, 107 



Radiobiological effectiveness 

 action of gamma particles 

 from Po on yeast, 20 

 action of carbon ions on hap- 

 loid yeast, 2 



Radiobiology 



role of electronic excitation, 75 



Radiolysis 



of H2O2 to determine radical 

 pair yield in beta irradiated wa- 

 ter, 66 



Radiomimetics 



action on complex molecules, 

 100, 101 



Radiosensitivity 



effects of unfolding, 117 



Ratio meter, 12 



Reaction rate constant 



radical fraction for F and R 

 reaction in irradiated water, 60 



Recombination 



diffusion theory for radical 



formation, 65 



electron and positive ion, 70 



Resonance 



absorption in liquid water, 27 

 resonative energy transfer, 112 

 dipole-dipole interaction, 87 

 self-quenching, 113 

 thermal quenching, 114 



Roentgen 



validity as unit for X ray meas- 

 urement. 103 



