A radiation analyzing apparatus comprising: a superconductive transition edge sensor configured to detect radiation and output a detection signal in accordance with the sensitivity of the superconductive transition edge sensor; a data acquisition unit configured to acquire a physical quantity of data having correlation with the sensitivity of the superconductive transition edge sensor, wherein the data acquisition unit acquires an output of a heater, which is configured to heat the superconductive transition edge sensor, as the physical quantity; and a sensitivity correction unit configured to correct the detection signal output from the superconductive transition edge sensor by using information regarding the correlation between the physical quantity of data acquired by the data acquisition unit and the sensitivity of the superconductive transition edge sensor characterised by: a spectrum generation unit configured to generate an energy spectrum of the radiation based on the detection signal output from the superconductive transition edge sensor and a signal obtained by performing sensitivity correction on the detection signal by the sensitivity correction unit, wherein the spectrum generation unit is configured to output signal data that includes the physical quantity of data and the detection signal output from the superconductive transition edge sensor, and wherein the sensitivity correction unit is configured to, by using the signal data output from the spectrum generation unit, while generating the information regarding correlation between the physical quantity of data and the sensitivity of the superconductive transition edge sensor, correct the detection signal by using the information regarding correlation. a superconductive transition edge sensor configured to detect radiation and output a detection signal in accordance with the sensitivity of the superconductive transition edge sensor; a data acquisition unit configured to acquire a physical quantity of data having correlation with the sensitivity of the superconductive transition edge sensor, wherein the data acquisition unit acquires an output of a heater, which is configured to heat the superconductive transition edge sensor, as the physical quantity; and a sensitivity correction unit configured to correct the detection signal output from the superconductive transition edge sensor by using information regarding the correlation between the physical quantity of data acquired by the data acquisition unit and the sensitivity of the superconductive transition edge sensor characterised by: a spectrum generation unit configured to generate an energy spectrum of the radiation based on the detection signal output from the superconductive transition edge sensor and a signal obtained by performing sensitivity correction on the detection signal by the sensitivity correction unit, wherein the spectrum generation unit is configured to output signal data that includes the physical quantity of data and the detection signal output from the superconductive transition edge sensor, and wherein the sensitivity correction unit is configured to, by using the signal data output from the spectrum generation unit, while generating the information regarding correlation between the physical quantity of data and the sensitivity of the superconductive transition edge sensor, correct the detection signal by using the information regarding correlation. a spectrum generation unit configured to generate an energy spectrum of the radiation based on the detection signal output from the superconductive transition edge sensor and a signal obtained by performing sensitivity correction on the detection signal by the sensitivity correction unit, wherein the spectrum generation unit is configured to output signal data that includes the physical quantity of data and the detection signal output from the superconductive transition edge sensor, and wherein the sensitivity correction unit is configured to, by using the signal data output from the spectrum generation unit, while generating the information regarding correlation between the physical quantity of data and the sensitivity of the superconductive transition edge sensor, correct the detection signal by using the information regarding correlation.