Patent Number: 
Section: claims

1. An X-ray detection plate comprising: an insulating substrate;  a first electrode film formed on the substrate;  a charge transport layer formed on the first electrode film;  an X-ray detection layer mainly consisted of amorphous selenium and formed in contact with the charge transport layer; and  a second electrode film formed on the X-ray detection layer,  wherein the charge transport layer is a semi-insulating resistive element having specific resistance between 10 6  xcexa9cm and 10 12  xcexa9cm inclusive, and the junction between the charge transport layer and the X-ray detection layer having characteristics of a diode whose cathode is the charge transport layer side and whose anode is the X-ray detection layer side. 2. An X-ray detection plate according to  claim 1 , wherein the thickness of the charge transport layer is between 0.01 xcexcm and 50 xcexcm inclusive and the selenium content of the X-ray detection layer is 90 weight % or more. claim 1 3. An X-ray detection plate according to  claim 1 , wherein the charge transport layer is a semi-insulating resistive element mainly consisted of diantimony trisulfide. claim 1 4. An X-ray detection plate according to  claim 1 , wherein the second electrode film is a metal film mainly consisted of gold. claim 1 5. An X-ray detection plate according to  claim 1 , wherein the first electrode film have transparency. claim 1 6. An X-ray detection plate according to  claim 5 , wherein the first electrode film is an ITO (indium tin oxide) film. claim 5 7. An X-ray detection plate according to  claim 5 , wherein the substrate have transparency. claim 5 8. An X-ray detection plate comprising: an insulating substrate;  a plurality of charge storage elements formed on the insulating substrate;  a plurality of first electrode films formed on the plurality of charge storage elements and electrically connected to the plurality of charge storage elements respectively;  a charge transport layer formed on the first electrode films;  an X-ray detection layer mainly consisting of amorphous selenium and formed in contact with the charge transport layer;  a second electrode film formed on the X-ray detection layer; and  a means for sequentially reading charge signals stored in the plurality of charge storage elements according to a time series, wherein the charge transport layer is a semi-insulating resistive element having specific resistance between 10 6  xcexa9cm and 10 12  xcexa9cm inclusive. 9. An X-ray detection plate according to  claim 8 , wherein the junction between the charge transport layer and the X-ray detection layer has characteristics of a diode whose cathode is the charge transport layer side and whose anode is the X-ray detection layer side. claim 8 10. An X-ray detection plate according to  claim 9 , wherein the thickness of the charge transport layer is between 0.01 xcexcm and 50 xcexcm inclusive and wherein the selenium content of the X-ray detection layer is 90 weight % or more. claim 9 11. An X-ray detection plate according to  claim 8 , wherein the thickness of the charge transport layer is between 0.01 xcexcm and 50 xcexcm inclusive and wherein the selenium content of the X-ray detection layer is 90 weight % or more. claim 8 12. An X-ray detection plate according to  claim 8 , wherein the charge transport layer is a semi-insulating resistive element mainly consisted of diantimony trisulfide. claim 8 13. An X-ray detection plate according to  claim 8 , wherein the second electrode film is a metal film mainly consisted of gold. claim 8 14. An X-ray detection plate according to  claim 8 , wherein the first electrode film have transparency. claim 8 15. An X-ray detection plate according to  claim 14 , wherein the first electrode film is an ITO (indium tin oxide) film. claim 14 16. An X-ray detection plate according to  claim 14 , wherein the substrate have transparency. claim 14 17. An X-ray detector having an X-ray detection plate, a power supply and an X-ray irradiator, wherein the power supply supplies a voltage to the X-ray detection plate and the X-ray irradiator is caused to emit an X-ray such that the X-ray detection plate is irradiated with the X-ray which has been transmitted by an object to be measured to form an image on the X-ray detection plate, the X-ray detection comprising: an insulating substrate;  a first electrode film formed on the substrate;  a charge transport layer formed on the first electrode film;  an X-ray detection layer mainly consisted of amorphous selenium and formed in contact with the charge transport layer; and  a second electrode film formed on the X-ray detection layer, wherein the charge transport layer is a semi-insulating resistive element having specific resistance between 10 6  xcexa9cm and 10 12  xcexa9cm inclusive, the junction between the charge transport layer and the X-ray detection layer having characteristics of a diode whose cathode is the charge transport layer side and whose anode is the X-ray detection layer side, and the power supply applying a voltage to the second electrode film during the irradiation with the X-ray, the voltage being lower than the voltage applied to the first electrode film. 18. An X-ray detector according to  claim 17 , further comprising a display device for displaying the image formed on the X-ray detection plate. claim 17 19. An X-ray detector having an X-ray detection plate, a power supply and an X-ray irradiator, wherein the X-ray irradiator is caused to emit an X-ray such that the x-ray detection plate is irradiated with the x-ray which has been transmitted by an object to be measured to form an image on the X-ray detection plate while a voltage is applied to the X-ray detection plate by the power supply, the X-ray detection plate comprising: an insulating substrate;  a plurality of charge storage elements formed on the insulating substrate;  a plurality of first electrode films formed on the plurality of charge storage elements and electrically connected to the plurality of charge storage elements respectively;  a charge transport layer formed on the first electrode films;  an X-ray detection layer mainly consisted of amorphous selenium and formed in contact with the charge transport layer;  a second electrode film formed on the X-ray detection layer; and  a means for sequentially reading charge signals stored in the plurality of charge storage elements according to a time series wherein the charge transport layer is a semi-insulating resistive element having specific resistance between 10 6  xcexa9cm and 10 12  xcexa9cm inclusive, and the power supply applying a voltage to the second electrode film during the irradiation with the X-ray, the voltage being lower than the voltage applied to the first electrode films. 20. An X-ray detector according to  claim 18 , further comprising a display device for displaying the image formed on the X-ray detection plate. claim 18