Radiation detector and radiation imaging device including same

A radiation detector comprising:

• an electric charge generation unit including a plurality of electric charge generation regions each configured to generate an electric charge corresponding to energy or the number of particles of radiation penetrating a subject, the plurality of electric charge generation regions being two-dimensionally arranged;
• and
• a plurality of read circuits being stacked with the electric charge generation unit, the plurality of read circuits each configured to output an intensity signal of the radiation based on the electric charge generated by each of the plurality of electric charge generation regions,
• wherein some read circuits thinned out from the plurality of read circuits each generate a spectral signal related to a spectrum of the radiation based on the electric charge and output the spectral signal.