Radiation detection apparatus

A radiation detection apparatus comprising:

• a scintillator having a fluorescent material to convert radiation to visible radiation photons;
• a projection structure provided on a visible radiation photon emitting face of the scintillator;
• a photon detection device array having a plurality of cells each of which includes a photon detection device to detect visible radiation photons emitted from a fluorescent material in the scintillator and convert the visible radiation photons to an electric signal;
• and
• a plurality of lenses provided on cells respectively in association with the cells to cause the visible radiation photons to be incident on the photon detection device in an associated cell, wherein
• the projection structure has a plurality of polygonal pyramid projection parts,
• the projection parts are arranged on a face of emission of the visible radiation photons of the scintillator, and
• a ratio of a height of each of the projection parts to a length of one side of a bottom face of each of the projection parts is in a range of 0.1 to 0.5.

A radiation detection apparatus comprising:

• a scintillator having a fluorescent material to convert radiation to visible radiation photons;
• a projection structure provided on a visible radiation photon emitting face of the scintillator;
• a photon detection device array having a plurality of cells each of which includes a photon detection device to detect visible radiation photons emitted from a fluorescent material in the scintillator and convert the visible radiation photons to an electric signal;
• and
• a plurality of lenses provided on cells respectively in association with the cells to cause the visible radiation photons to be incident on the photon detection device in an associated cell,
• wherein the photon detection device is an avalanche photodiode of pn-junction type, and each of the plurality of cells further comprises resistors provided to surround active regions of the avalanche photodiode.