Abstract: According to one embodiment, a radiation detector includes detection parts detecting radiation directly or in cooperation with a scintillator, a controller reading out a signal charge from each detection part, a memory part storing an upper limit and a lower limit of a normal pixel value in a dark image preliminarily obtained and data about a temperature dependence of the upper and lower limits, and a temperature sensor measuring a temperature of the radiation detector. The controller reads out the signal charge from each detection part in a state of no intended radiation irradiation and images the dark image, acquires a temperature when the dark image measured by the temperature sensor is imaged, extracts the upper and lower limits corresponding to the acquired temperature from the memory part, and inspects a pixel value in the imaged dark image by using the extracted upper limit and the lower limit.

Abstract: According to one embodiment, a radiation detector includes detection parts detecting radiation directly or in cooperation with a scintillator, a controller reading out a signal charge from each detection part, a memory part storing an upper limit and a lower limit of a normal pixel value in a dark image preliminarily obtained and data about a temperature dependence of the upper and lower limits, and a temperature sensor measuring a temperature of the radiation detector. The controller reads out the signal charge from each detection part in a state of no intended radiation irradiation and images the dark image, acquires a temperature when the dark image measured by the temperature sensor is imaged, extracts the upper and lower limits corresponding to the acquired temperature from the memory part, and inspects a pixel value in the imaged dark image by using the extracted upper limit and the lower limit.