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First derivative of the ESR spectrum of the post-irradiation (PVP) solid state initiated by 60Co gamma radiation (20 kGy) at room temperature for (a) neat (PVP) and irradiated (PVP) at (b) 10, (c) 20, (d) 30, (e) 40, and (f) 50 kGy with respect to the applied magnetic field (Gauss). Below shows the pictures of the probability of where the unpaired electrons are centered.
