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In this study, radiation effects on coffee beans have been investigated by Electron Spin Resonance (ESR) technique. ESR spectra of natural and irradiated samples at different doses between 0.5 Gy and 11 kGy by 60 Co gamma source were recorded with X-band ESR spectrometer and, radiation dose, ESR microwave power and cavity temperature dependency of paramagnetic centers were investigated. At the results of doseresponse and kinetic studies it was determined that the paramagnetic centers in coffee beans are stable, and sensitive to radiation. Thus, it is shown that the irradiated beans can be used for detection as radiation dosimeter in the investigated dose range.