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Mechanisms which break polymer chains are familiar to biologists because of their effect on DNA: ionizing radiation (most commonly ultraviolet light), free radicals, and oxidizers such as oxygen, ozone, and chlorine.
Krytox is a fluorether-based vacuum grease, useful from -75 to over 350 °C, not flammable even in liquid oxygen, and highly resistant to ionizing radiation.
Radioluminescence, production of luminescence in a material by the bombardment of ionizing radiation
Petkau conducted further experiments with simulated cells in 1976 and found that the enzyme Superoxide dismutase protected the cells from free radicals generated by ionizing radiation, obviating the effects seen in his earlier experiment.
He is best known for his work in the field of ionizing radiation response on Bipolar junction transistor (BJT) and Enhanced Low Dose Rate Sensitivity in BJT.