RADIATION DETECTOR AND RADIOLOGICAL IMAGE RADIOGRAPHING APPARATUS

摘要

A radiation detector and a radiological image radiographing apparatus capable of improving the quality of an obtained radiological image without causing an additional cost are provided. A first scintillator configured to include columnar crystals generating first light corresponding to a radiation emitted through a TFT substrate is laminated on the other surface of the TFT substrate that has a first photoelectric conversion element, which has one surface from which a radiation is emitted and the other surface from which at least one of the first light and the second light is emitted and which generates electric charges corresponding to the light, and a first switching element. A second scintillator which generates second light corresponding to a radiation emitted through the first scintillator and has different energy characteristics of absorbed radiations from the first scintillator is laminated on a surface of the first scintillator not facing the TFT substrate.

主权项

1. A radiation detector comprising:
a first substrate having a first photoelectric conversion element, which has one surface from which a radiation is emitted and the other surface from which light is emitted and which generates electric charges corresponding to the light, and a first switching element for reading the electric charges generated by the first photoelectric conversion element; a first phosphor layer which is laminated on the other surface of the first substrate, generates first light corresponding to a radiation emitted through the first substrate, is configured to include columnar crystals, and has non-columnar crystals formed on a surface laminated on the first substrate wherein distal end of the columnar crystals is positioned at an opposite side to the first substrate side; a second phosphor layer which is laminated on a surface of the first phosphor layer not facing the first substrate, generates second light corresponding to a radiation emitted through the first phosphor layer, and has different energy characteristics of absorbed radiations from the first phosphor layer; a second substrate which is provided between the first phosphor layer and the second phosphor layer and which has a second photoelectric conversion element, which generates electric charges corresponding to the second light generated by the second phosphor layer, and a second switching element for reading the electric charges generated by the second photoelectric conversion element; and a buffering layer which is interposed between the distal ends of the columnar crystals and the second substrate, abutting at least at the distal ends of the columnar crystals to protect the distal end of the columnar crystals, wherein light emitted from the other surface is at least one of the first light and the second light.