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The use of ionizing radiation for sterilization of pharmaceuticals is now a well established technology. The purpose of the present work was to apply the electron spin resonance (ESR) spectroscopy to the irradiation dosimetry of terbutaline. Our preliminary work indicates that: - evaluation of the irradiation dose could be possible by post-irradiation using a polynomial regression; - the decay of radicals upon storage could be simulated by a bi-exponential regression; discrimination of irradiated drugs from unirradiated ones could be possible even after a storage greater than 3 years.