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Electron spin relaxation behaviors of radiation induced radicals were studied by the continuous microwave saturation method of electron spin resonance (ESR) spectra. Radiation induced radicals in kampo extractions yielded a sharp and intense ESR signal P1 at g = 2.0 and S1 , S2 beside P1 signal. By the progressive saturation procedure, we could evaluate relaxation times (T1 and T2) of P1 signal. The computer program to analyze the ESR line shape using all data points on a saturation curve was applied. Based on the theoretical analysis, the relaxation behaviors of radicals were revealed. Radiation induced radicals of the specimens yielded relaxation times, T1 in the · sec and T2 in nsec ranges, respectively. Upon the irradiation, T2 is shortened. And upon the re-irradiation, T2 is not changed.

Electron spin relaxation behavior of radiation induced-radicals of kampo extraction