Scintillator panel and radiation image sensor

• US 20030001101A1
• Filed: 08/14/2002
• Published: 01/02/2003
• Est. Priority Date: 06/18/1998
• Status: Active Grant

• Current Assignee: Hamamatsu Photonics KK
• Original Assignee: Hamamatsu Photonics KK
• Inventors: Homme, Takuya, Sato, Hiroto, Suzuki, Takaharu, Takabayashi, Toshio, Natsume, Yoshio
• Granted Patent: US 7,034,306 B2
• Time in Patent Office: Days
• US Class Current: 250/370.11
• CPC Class Codes: G01T 1/202 the detector being a crystal

Abstract

An Ag film as a light-reflecting film is formed on one surface of an a-C substrate of a scintillator panel. The entire surface of the Ag film is covered with an SiN film for protecting the Ag film. A scintillator having a columnar structure, which converts an incident radiation into visible light, is formed on the surface of the SiN film. The scintillator is covered with a polyparaxylylene film together with the substrate.

Claims

1. A scintillator panel comprising:

a radiation-transmitting substrate;

a reflective metal thin film disposed on said substrate;

a protective film covering an entire surface of said reflective metal thin film; and

a scintillator deposited on said protective film,

and wherein said protective film has a function to protect said reflective metal thin film against said scintillator.

2. A scintillator panel according to claim 1, wherein said reflective metal thin film is directly disposed on said substrate.

3. A scintillator panel according to claim 1, wherein said reflective metal thin film is substantially made of a material containing a substance selected from the group consisting of Al, Ag, Cr, Cu, Ni, Ti, Mg, Rh, Pt, and Au.

4. A scintillator panel according to claim 1, wherein said protective film is an inorganic film.

5. A scintillator panel according to claim 4, wherein said protective film is substantially made of a material containing a substance selected for the group consisting of LiF, MgF₂, SiO₂, TiO₂, Al₂O₃, MgO and SiN.

6. A scintillator panel according to claim 1, wherein said protective film is an organic film.

7. A scintillator panel according to claim 6, wherein said protective film is substantially made of polyimide.

8. A scintillator panel according to claim 4, wherein said protective film is a metal oxide film.

9. A scintillator panel according to claim 8, wherein said protective film is an oxidized material of said reflective metal thin film.

10. A scintillator panel according to claim 1, wherein said protective film includes an inorganic film and an organic film.

11. A scintillator panel according to claim 1, further comprised of an organic film covered said scintillator.

12. A scintillator panel according to claim 11, wherein said organic film further covers at least an outer periphery of said protective film.

13. A scintillator panel according to claim 12, wherein said organic film further covers an entire surface of said substrate.

14. A radiation image sensor characterized in that an image sensing element is arranged to face said scintillator of said scintillator panel of claim 1.

16. A scintillator panel according to claim 15, wherein said reflective metal thin film is directly disposed on said substrate.

17. A scintillator panel according to claim 15, wherein said reflective metal thin film is substantially made of a material containing a substance selected from the group consisting of Al, Ag, Cr, Cu, Ni, Ti, Mg, Rh, Pt, and Au.

18. A scintillator panel according to claim 15, wherein said protective film is an inorganic film.

19. A scintillator panel according to claim 18, wherein said protective film is substantially made of a material containing a substance selected for the group consisting of LiF, MgF₂, SiO₂, TiO₂, Al₂O₃, MgO and SiN.

20. A scintillator panel according to claim 14, wherein said protective film is an organic film.

21. A scintillator panel according to claim 20, wherein said protective film is substantially made of polyimide.

22. A scintillator panel according to claim 18, wherein said protective film is a metal oxide film.

23. A scintillator panel according to claim 22, wherein said protective film is an oxidized material of said reflective metal thin film.

24. A scintillator panel according to claim 15, wherein said protective film includes an inorganic film and an organic film.

25. A scintillator panel according to claim 15, further comprised of an organic film covered said scintillator.

26. A scintillator panel according to claim 25, wherein said organic film further covers at least part of a surface of said substrate.

27. A scintillator panel according to claim 26, wherein said organic film further covers an entire surface of said substrate.

28. A radiation image sensor characterized in that an image sensing element is arranged to face said scintillator of said scintillator panel of claim 15.

30. A scintillator panel according to claim 29, wherein said substrate is any one of a glass substrate, an aluminum substrate, or a substrate which has carbon as a main component.

31. A scintillator panel according to claim 29, wherein said substrate is a conductive substrate, and said intermediate film prevents contact between said substrate and said metal thin film.

32. A scintillator panel according to claim 31, wherein said conductive substrate is either an aluminum substrate or a substrate that has carbon as a main component.

33. A scintillator panel according to claim 30, wherein said substrate that has carbon as a main component contains amorphous carbon.

34. A scintillator panel according to claim 29, wherein said metal thin film is made of material containing a substance selected from the group consisting of Al, Ag, Cr, Cu, Ni, Ti, Mg, Rh, Pt, and Au.

35. A scintillator panel according to claim 29, wherein said protective film comprises an inorganic film.

36. A scintillator panel according to claim 35, wherein said inorganic film is made of material containing a substance selected from the group consisting of LiF, MgF₂, SiO₂, TiO₂, Al₂O₃, MgO, and SiN.

37. A scintillator panel according to claim 35, wherein said inorganic film is made of material containing a substance selected from the group consisting of Al, Ag, Cr, Cu, Ni, Ti, Mg, Rh, and Pt.

38. A scintillator panel according to claim 29, wherein said protective film comprises an organic film.

39. A scintillator panel according to claim 38, wherein said organic film is made of material containing a substance selected from the group consisting of polyimide and xylylene-type materials.

40. A scintillator panel according to claim 29, wherein said protective film is formed from an inorganic film and an organic film.

41. A scintillator panel according to claim 29, wherein said scintillator is covered by an organic film.

42. A scintillator panel according to claim 41, wherein said organic film furthermore extends to at least one part of the surface of said substrate.

43. A scintillator panel according to claim 42, wherein said organic film covers substantially the entire surface of said substrate.

44. A scintillator panel according to claim 29, wherein said intermediate film comprises either an organic film or an inorganic film, or a combination of the two.

45. A scintillator panel according to claim 29, wherein said metal thin film is adhered to said intermediate film and said protective film and sealed by both.

46. A scintillator panel according to claim 45, wherein said intermediate film substantially envelops said substrate.

47. A scintillator panel according to claim 45, wherein said intermediate film is a film formed on the substrate by CVD.

48. A scintillator panel according to claim 45, wherein said intermediate film is a xylylene-type film.

15. A scintillator panel characterized by comprising:

a radiation-transmitting substrate;

a reflective metal thin film disposed on said substrate;

a protective film disposed on said reflective metal thin film; and

a scintillator deposited on said protective film at a position except an edge portion thereof,

wherein said reflective metal thin film transmits radiation and reflects light irradiated from said scintillator,

and wherein said protective film has a function to protect said reflective metal thin film against said scintillator.

29. A scintillator panel comprising:

a radiation-transmitting substrate;

a metal thin film formed on said substrate, which is a radiation-transmittable and reflects light of a predetermined wavelength;

a protective film formed on said metal thin film; and

a scintillator comprising a large number of columnar crystals which are deposited on said protective film and which convert radiation into light of wavelengths that can be reflected by said metal thin film, said protective film preventing contact between said metal thin film and said scintillator, further comprised of;

an intermediate film disposed between said substrate and said metal thin film to adhere said substrate and said metal thin film.

50. A radiation image sensor comprising:

the scintillator panel according to claim 29; and

an image-sensing element for capturing optical images obtained by converting radiation which is outputted from a surface opposite to said substrate of said scintillator panel.

51. A radiation image sensor according to claim 50, wherein said image-sensing element is disposed facing the scintillator side of said scintillator panel.

49. A scintillator panel comprising:

a radiation-transmitting substrate;

a metal thin film formed on said substrate, which is radiation-transmittable and reflects light of a predetermined wavelength;

a protective film formed on said metal thin film; and

a scintillator comprising a large number of columnar crystals which are deposited on said protective film and which convert radiation into light of wavelengths that can be reflected by said metal thin film,

wherein said protective film prevents contact between said metal thin film and said scintillator, and said scintillator panel further comprises of an intermediate film disposed between said substrate and said metal thin film for improving the adhesion between said substrate and said metal thin film.

52. A scintillator panel comprising:

a radiation-transmitting substrate;

a metal reflective film formed on one surface of said substrate;

a protective organic film which covers said metal reflective film and which also covers at least the side walls of said substrate;

an alkali halide-type scintillator which is formed as a large number of needle crystals by deposition on said protective organic film over said metal reflective film; and

a moisture-proof organic film covering said scintilltor;

wherein said protective organic film prevents scintillator components from becoming attached to said substrate and said metal reflective film during the deposition of said scintillator, and said moisture-proof organic film covers the scintillator including the scintillator components which are attached to said protective organic film.

53. A scintillator panel according to claim 52, wherein said protective organic film substantially further covers the other surface of said substrate.

54. A scintillator panel according to claim 52, wherein said protective organic film is an organic film formed by vapor phase epitaxy.

55. A scintillator panel according to claim 52, wherein said protective organic film comprises a first protective organic film on said metal reflective film side and a second protective organic film on said substrate side, the peripheral edges of said first protective organic film being laminated to said second protective organic film on the peripheral edges or in the area outside these peripheral edges of said metal reflective film.

57. A making method for a scintillator panel according to claim 56, wherein the step of forming said protective organic film is performed using vapor phase epitaxy.

58. A making method for a scintillator panel according to claim 56, wherein the step of forming said protective organic film comprises the steps of:

forming a first protective organic film which covers said metal reflective film, and also covers at least the exposed surfaces of said substrate on the periphery of said metal reflective film; and

forming a second protective organic film in a frame shape, covering an area extending from the peripheral edges of said first protective organic film to the side walls of said substrate.

59. A making method for a scintillator panel according to claim 52, wherein the step of forming said protective organic film comprises the steps of:

forming a second protective organic film in a frame shape, covering an area extending from the side walls of said substrate to the peripheral edges of said metal reflective film; and

forming a first protective organic film which covers said metal reflective film, and which is laminated to said second protective organic film at the peripheral edges of said metal reflective film.

56. A making method for a scintillator panel, comprising the steps of:

forming a metal reflective film on one surface of a radiation-transmitting substrate;

forming a protective organic film which covers an area extending from at least one surface of said substrate, including said metal reflective film, to the side walls of said substrate;

forming a scintillator through the growth of a large number of needle crystals by depositing alkali halide-type scintillator components on only a predetermined part of the surface of said protective organic film which is substantially on said metal reflective film, while preventing the scintillator components from becoming attached to said metal reflective film and said substrate using said protective organic film; and

forming a moisture-proof organic film covering said scintillator including the scintillator components which have become attached to outside of said predetermined part.

60. A scintillator panel comprising:

a radiation-transmitting substrate;

a metal reflective film formed on one surface of said substrate;

a first protective organic film covering said metal reflective film;

an alkali halide-type scintillator formed as a large number of needle crystals by deposition on the part of said first protective organic film covering said metal reflective film;

a frame-shaped second protective organic film covering an area extending from the side walls of said scintillator to at least the side wall parts of said substrate; and

a moisture-proof organic film covering said scintillator and the surface of said second protective organic film.

63. A scintillator panel according to claim 60, wherein a plurality of through holes is formed in a section on the outside of the scintillator formation area of said substrate, and which is covered by said second protective organic film.

64. A scintillator panel according to claim 60, wherein said second protective organic film is opaque in respect of at least light generated by said scintillator.

61. A scintillator panel comprising:

a radiation-transmitting substrate;

a metal reflective film formed on one surface of said substrate;

a first protective organic film covering said metal reflective film;

an alkali halide-type scintillator formed as a large number of needle crystals by deposition on the part of said first protective organic film covering said metal reflective film;

a moisture-proof organic film covering an area extending from said scintillator to at least the side walls of said substrate; and

a frame-shaped second protective organic film covering an area extending from the side walls of said scintillator to at least the side wall parts of said substrate.

62. A scintillator panel according to claim 61, wherein said second protective organic film extends to a surface opposite the scintillator formation surface of said substrate.

65. A making method for a scintillator panel, comprising the steps of:

forming a metal reflective film on one surface of a radiation-transmitting substrate;

forming a first protective organic film on said metal reflective film;

forming a scintillator through the growth of a large number of needle crystals by depositing alkali halide-type scintillator components on the part of said first protective organic film covering said metal reflective film;

forming a second protective organic film covering an area extending from the side walls of said scintillator to at least the side walls of said substrate; and

forming a moisture-proof organic film covering said scintillator and also the surface of said second protective organic film.

66. A making method for a scintillator panel, comprising the steps of:

forming a metal reflective film on one surface of a radiation-transmitting substrate;

forming a first protective organic film on said metal reflective film;

forming a scintillator through the growth of a large number of needle crystals by depositing alkali halide-type scintillator components on the part of said first protective organic film covering said metal reflective film;

forming a moisture-proof organic film covering an area extending from said scintillator to at least the side walls of said substrate; and

forming a second protective organic film over said moisture-proof organic film, covering an area extending from the side walls of said scintillator to at least the side wall parts of said substrate.