Scintillator and radiation detector

Patent metadata

Field	Value
Publication number	US-12195653-B2
Application number	US-202117445847-A
Country	US
Kind code	B2
Filing date	Aug 25, 2021
Priority date	Feb 18, 2021
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

According to one embodiment, a scintillator includes a first layer. The first layer includes a first organic substance capable of emitting light, and a second organic substance. The second organic substance includes at least one selected from the group consisting of a carbonyl group, phosphine oxide, and a sulfinyl group. The first layer emits light based on beta rays incident on the first layer. A period from a time of a maximum value of an intensity of the light until the intensity of the light drops to 1/2.72 of the maximum value is not less than 10 ns.

First claim

What is claimed is:

1. A scintillator, comprising:
a first layer, wherein
the first layer includes
a first organic substance capable of emitting light, and
a second organic substance,

the second organic substance includes at least one selected from the group consisting of a carbonyl group, phosphine oxide, and a sulfinyl group,
the first layer emits light based on beta rays incident on the first layer,
a period from a time of a maximum value of an intensity of the light until the intensity of the light drops to 1/2.72 of the maximum value is not less than 10 ns, and
the first organic substance includes a thermally activated delayed fluorescence material.

2. The scintillator according to claim 1 , wherein
the first layer further includes a third organic substance,
the third organic substance is a polymer, and
the third organic substance is located around the first and second organic substances.

3. The scintillator according to claim 2 , wherein
a molecular weight of the second organic substance is less than a molecular weight of the third organic substance.

4. The scintillator according to claim 2 , wherein
a molecular weight of the second organic substance is not less than 100 and not more than 1,000.

5. The scintillator according to claim 1 , wherein
a concentration of the second organic substance in the first layer is not less than 10 wt % and not more than 50 wt %.

6. The scintillator according to claim 1 , wherein
a thickness of the first layer is not less than 200 μm and not more than 1,500 μm.

7. The scintillator according to claim 1 , wherein
the second organic substance includes an aromatic compound.

8. The scintillator according to claim 1 , wherein
the second organic substance includes bis[2-(diphenylphosphino)phenyl]ether oxide.

9. The scintillator according to claim 1 , wherein
the second organic substance includes at least one selected from the group consisting of 1,3-bis(3-(diphenylphosphoryl)phenyl)benzene, 10-phenyl-10H,10′H-spiro[acridine-9,9′-anthracen]-10′-one, and 9,9′-(5-(phenylsulfonyl)-1,3-phenylene)-bis(9H-carbazole).

10. The scintillator according to claim 1 , wherein
the first organic substance includes at least one selected from the group consisting of:
2,4,5,6-tetra(9H-carbazole-9-yl)isophthalonitrile;
2,4,6-tris(4-(9,9-methylacridan-10-yl)phenyl)-1,3,5-triazine;
10-(4-(bis(2,3,5-tetramethylphenyl)boranyl)-2,3,5-tetramethylphenyl)-10H-phenoxazine;
2,4,6-tri(9H-carbazole-9-yl)-3,5-difluorobenzonitrile; and
9-[1,4]benzoxaborino[2,3,4-kl]phenoxaborin-7-yl-1,3,6,8-tetramethyl-9H-carbazole.

11. The scintillator according to claim 1 , wherein
an absorption wavelength band of the second organic substance is not more than 380 nm.

12. A radiation detector, comprising:
the scintillator according to claim 1 ; and
a light detecting part configured to detect the light from the first layer.

13. The detector according to claim 12 , wherein
the light detecting part includes:
a first conductive layer;
a second conductive layer located between the first layer and the first conductive layer; and
an organic semiconductor layer located between the first conductive layer and the second conductive layer.

14. The detector according to claim 13 , wherein
a sensitivity of a first signal generated between the first conductive layer and the second conductive layer when the beta rays are incident on the first layer is greater than a sensitivity of a second signal generated between the first conductive layer and the second conductive layer when at least one of gamma rays, neutron rays, or X-rays are incident on the first layer.

15. The detector according to claim 13 , wherein
the organic semiconductor layer includes polythiophene and a fullerene derivative.

16. A scintillator, comprising:
a first layer, wherein
the first layer includes
a first organic substance capable of emitting light, and
a second organic substance,

the second organic substance includes at least one selected from the group consisting of a carbonyl group, phosphine oxide, and a sulfinyl group,
the first layer emits light based on beta rays incident on the first layer,
a period from a time of a maximum value of an intensity of the light until the intensity of the light drops to 1/2.72 of the maximum value is not less than 10 ns, and
a second weight concentration of the second organic substance in the first layer is greater than a first weight concentration of the first organic substance in the first layer.

17. The scintillator according to claim 16 , wherein
the second weight concentration is not less than 4 times the first weight concentration.

18. The scintillator according to claim 16 , wherein
the second weight concentration is not more than 10 times the first weight concentration.

19. A scintillator, comprising:
a first layer, wherein
the first layer includes
a first organic substance capable of emitting light, and
a second organic substance,

the second organic substance includes at least one selected from the group consisting of a carbonyl group, phosphine oxide, and a sulfinyl group,
the first layer emits light based on beta rays incident on the first layer,
a period from a time of a maximum value of an intensity of the light until the intensity of the light drops to 1/2.72 of the maximum value is not less than 10 ns, and
the first organic substance includes a benzene derivative including carbazole and a cyano group.

Assignees

• Toshiba Kk

Inventors

• Wada Atsushi
• Takasu Isao
• Aiga Fumihiko
• Nakayama Kohei
• Nomura Yuko

Classifications

• G01T1/2033

  Selection of materials · CPC title

• C09K2211/1007

  Non-condensed systems · CPC title

• C09K2211/1011

  Condensed systems · CPC title

• C09K2211/1018

  Heterocyclic compounds · CPC title

• G01T1/2014

  Reading out of stimulable sheets, e.g. latent image · CPC title