Radiation detection apparatus and radiation imaging system

1. A radiation detection apparatus comprising:

a sensor panel including a photoelectric conversion unit provided with a plurality of photoelectric conversion elements;

a wavelength converter, disposed over the photoelectric conversion unit, for converting radiation into light detectable by the photoelectric conversion elements;

a protective layer covering the wavelength converter, and having a base member and a metal layer disposed between the wavelength converter and the base member;

an electroluminescence light source, having a light-emitting layer disposed between electrodes for applying an alternating current voltage across the light-emitting layer, for emitting light to the photoelectric conversion unit, wherein the electroluminescence light source is disposed between the wavelength converter and the base member, one of the electrodes is a light-transmitting electrode disposed between the wavelength converter and the light-emitting layer, and the other of the electrodes is the metal layer and functions to reflect the light converted by the wavelength converter to the photoelectric conversion elements and to emit light from the light-emitting layer to the photoelectric conversion elements; and

an adhesive layer disposed between the light-transmitting electrode and the wavelength converter and disposed between the protective layer and the sensor panel, wherein the electroluminescence light source is bonded and fixed to the wavelength converter by the adhesive layer, and the protective layer is bonded and fixed to the sensor panel at the periphery of the protective layer.

2. The radiation detection apparatus according to claim 1 , further comprising a light-absorption layer disposed on a side opposite to a side where the electroluminescence light source is disposed.

3. The radiation detection apparatus according to claim 2 , wherein a first area where the light-emitting layer is disposed is larger than a second area where the plurality of photoelectric conversion elements are disposed, and the first area is smaller than a third area where the protective layer is disposed.

4. The radiation detection apparatus according to claim 3 , wherein the electroluminescence light source is bonded and fixed to the wavelength converter by the adhesive layer at the first area, and the protective layer is bonded and fixed to the sensor panel at the periphery of the protective layer in the third area.

5. The radiation detection apparatus according to claim 3 , wherein a fourth area where the light absorption layer is disposed is larger than the first area, and the fourth area is smaller than the third area.

6. The radiation detection apparatus according to claim 3 , wherein the sensor panel further includes a phosphor underlying layer covered covering the plurality of photoelectric conversion elements, and a fifth area where the phosphor underlying layer is larger than the third area.

7. A radiation imaging system comprising:

a radiation detection apparatus according to claim 1 ;

signal processing means which processes a signal from the radiation detection apparatus;

recording means which records a signal from the signal processing means;

display means which displays a signal from the signal processing means;

transmission processing means which transmits a signal from the signal processing means; and

a radiation source which generates the radiation.

8. The radiation detection apparatus according to claim 1 , wherein the adhesive layer is formed from a hot melt resin.

9. The radiation detection apparatus according to claim 1 , wherein the wavelength converter comprises a plurality of columnar crystals.

10. The radiation detection apparatus according to claim 1 , wherein the base member is made of organic material.

11. The radiation detection apparatus according to claim 1 , wherein the metal layer reflects the light converted by the wavelength converter through the light-emitting layer and the light-transmitting electrode to the photoelectric conversion elements.