The two main types of radiation type are ionizing and nonionizing.
The ionizing would be the radiotherapy and non-iodizing is from the sun.
Ionizing = free radical formation non ionizing (UVB) = DNA damage by formation of pyrimidine dimers
aoitnRdai uessac dmaeag by angtnergei yldryoxh eref aidraslc aPmo(hat ecpahtr 3 tbale). roT,erfhee fi tseiomnhg imszimnei the dgmaae of ridotia,na it sah to ihbinti eref acridal aromotnfi.
therapeutic ionizing radiation(gamma rays,x-rays); -DNA double-strand breakage -Free radical formation
And just incase you were as curious as I am and wanted to know what tautomerism is.... A tautomer is an isomer , and isomers are compounds that have the same number of atoms of the same element but different structural arrangemennts
A NOTE TO SELF : DO NOT PICK THIS ANSWER IN THE EXAM
Free radicals damage cells via membrane lipid peroxidation, protein modification, DNA breakage. Initiated via radiation exposure (eg, cancer therapy), metabolism of drugs (phase I), redox reactions, nitric oxide (eg, inflammation), transition metals, WBC (eg, neutrophils, macrophages) oxidative burst.