RADIATION MONITOR

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The purpose of the present invention is to provide a radiation monitor that can easily and accurately measure the dosage rate of radiation while inhibiting the risk of explosions and the like, and that can also measure the temperature of a radiation light emitting element itself. The radiation monitor M1 according to the present invention comprises : a radiation light emitting element 10 that contains a rare earth element and that emits light of a plurality of wavelengths by means of incident radiation; an optical fiber 20 that transmits the light emitted from the radiation light emitting element 10; an electrical pulse converter 30 that converts the transmitted light to electrical pulses at each wavelength; an electrical pulse detector 40 that measures the counting rate of electrical pulses at each wavelength using the electrical pulses sent from the electrical pulse converter 30; and an analyzer 50 that computes the dosage rate of radiation and the temperature of the radiation light emitting element 10 by collating the counting rate of electrical pulses measured at each wavelength and the relationship of the counting rate of photons to the temperature of the radiation light emitting element 10 and the dosage rate of radiation stored in a database in advance.