Scintillator panel and radiation detector

Patent metadata

Field	Value
Publication number	US-9377541-B2
Application number	US-201514923699-A
Country	US
Kind code	B2
Filing date	Oct 27, 2015
Priority date	Nov 5, 2014
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A scintillator panel includes a scintillator layer that includes a phosphor including columnar crystals in which an X-ray rocking curve of a specific plane index measured by applying an X-ray to a columnar crystal growth ending surface after cutting to have a thickness of 5 μm from a columnar crystal growth starting surface has a half-width (a) of equal to or less than 15 degrees, an X-ray rocking curve of the specific plane index measured by applying an X-ray to the columnar crystal growth ending surface without cutting has a half-width (b) of equal to or less than 15 degrees, and a ratio (a/b) is within a range of from 0.5 to 2.0. The scintillator panel can provide radiation images having higher sharpness.

First claim

What is claimed is:

1. A scintillator panel comprising:
a support body; and
a scintillator layer formed on the support body,
the scintillator layer including a phosphor comprising columnar crystals and
the columnar crystals being formed from a columnar crystal growth starting surface of the scintillator layer to a columnar crystal growth ending surface thereof over an entire thickness direction of the scintillator layer,
wherein in the scintillator layer, an X-ray rocking curve of a specific plane index measured by applying an X-ray to the columnar crystal growth ending surface after cutting to have a thickness of 5 μm from the columnar crystal growth starting surface has a half-width (a) of equal to or less than 15 degrees; an X-ray rocking curve of the specific plane index measured by applying an X-ray to the columnar crystal growth ending surface without cutting has a half-width (b) of equal to or less than 15 degrees; and a ratio (a/b) of the half-width (a) to the half-width (b) is from 0.5 to 2.0.

2. The scintillator panel according to claim 1 , wherein the ratio (a/b) is from 0.9 to 1.1.

3. The scintillator panel according to claim 1 , wherein when, of the half-widths (a) and (b), the half-width (a) is larger, a surface located on a support body side with respect to the scintillator layer is a radiation input surface, whereas when the half-width (b) is larger, a surface located on a non-support body side with respect to the scintillator layer is a radiation input surface.

4. The scintillator panel according to claim 1 , wherein the specific plane index is (200).

5. The scintillator panel according to claim 1 , wherein the phosphor is an alkali halide phosphor of a cubic crystal system.

6. The scintillator panel according to claim 1 , wherein the phosphor is cesium iodide activated with a thallium compound, (CsI:Tl).

7. A radiation detector comprising the scintillator panel according to claim 1 and a photoelectric conversion element panel.

8. A radiation detector comprising:
a photoelectric conversion element panel; and
a scintillator layer formed on the photoelectric conversion element panel,
the scintillator layer including a phosphor comprising columnar crystals and
the columnar crystals being formed from a columnar crystal growth starting surface of the scintillator layer to a columnar crystal growth ending surface thereof over an entire thickness direction of the scintillator layer,
wherein in the scintillator layer, an X-ray rocking curve of a specific plane index measured by applying an X-ray to the columnar crystal growth ending surface after cutting to have a thickness of 5 μm from the columnar crystal growth starting surface has a half-width (a) of equal to or less than 15 degrees; an X-ray rocking curve of the specific plane index measured by applying an X-ray to the columnar crystal growth ending surface without cutting has a half-width (b) of equal to or less than 15 degrees; and a ratio (a/b) of the half-width (a) to the half-width (b) is from 0.5 to 2.0.

9. The radiation detector according to claim 8 , wherein the ratio (a/b) is from 0.9 to 1.1.

10. The radiation detector according to claim 8 , wherein when, of the half-widths (a) and (b), the half-width (a) is larger, a surface located on a photoelectric conversion element panel side with respect to the scintillator layer is a radiation input surface, whereas when the half-width (b) is larger, a surface located on a non-photoelectric conversion element panel side with respect to the scintillator layer is a radiation input surface.

11. The radiation detector according to claim 8 , wherein the specific plane index is (200).

12. The radiation detector according to claim 8 , wherein the phosphor is an alkali halide phosphor of a cubic crystal system.

13. The radiation detector according to claim 8 , wherein the phosphor is cesium iodide activated with a thallium compound, (CsI:Tl).

Assignees

• Konica Minolta Inc

Inventors

• Hasegawa Atsushi
• Maeda Keiko

Classifications

• G01T1/2012 Primary

  using stimulable phosphors, e.g. stimulable phosphor sheets · CPC title

• G01T1/161

  Applications in the field of nuclear medicine, e.g. in vivo counting {(apparatus for radiation diagnosis A61B6/00)} · CPC title

• G01T1/202 Primary

  the detector being a crystal · CPC title