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Single crystals of 4-choloromethyl pyridinium chloride were investigated between 123 and 300 K by the electron paramagnetic resonance method after being damaged at 296 K by γ -irradiation. The paramagnetic species was attributed to the cation radical.The principal values of the hyperfine coupling tensor of the unpaired electron with these ring atoms, and the principal values of the g tensor were determined. The results were found to be in good agreement with the existing literature data and theoretical predictions.