Scintillator array for radiation detection

Patent metadata

Field	Value
Publication number	US-12105231-B2
Application number	US-202318144544-A
Country	US
Kind code	B2
Filing date	May 8, 2023
Priority date	Jan 26, 2021
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

A radiation detector includes a photodetector and a scintillator coupled thereto. The scintillator is formed of a scintillator material comprising an organic glass scintillator (OGS) material and at least one of a polymer additive or a plasticizer additive. The scintillator emits light when radiation is received at the scintillator, and the light is received by the photodetector. The radiation detector can further include a frame that has an interior cavity that holds the scintillator in position with respect to the photodetector, such that the light emitted by the scintillator is transmitted to the photodetector. The scintillator can be formed by casting amorphous scintillator material in the interior cavity of the frame. The frame can then be coupled to the photodetector to form the radiation detector.

First claim

What is claimed is:

1. A method for making a radiation detector, the method comprising:
providing a photodetector;
providing a mold, the mold having an interior cavity;
flowing an amorphous scintillator material into the interior cavity of the mold, the amorphous scintillator material comprising an organic glass scintillator (OGS) material and at a plasticizer additive, wherein the plasticizer additive is present in the amorphous scintillator material at a concentration of between 1% and 10% of a mass of the amorphous scintillator material;
cooling the amorphous scintillator material within the interior cavity to form a scintillator; and
coupling the mold to the photodetector such that the photodetector receives light that is emitted by the scintillator responsive to incidence of radiation at the scintillator.

2. The method of claim 1 , further comprising electropolishing a surface of the interior cavity of the mold prior to flowing the amorphous scintillator material into the interior cavity, such that the surface of the interior cavity has a reflectivity of at least 90% with respect to wavelengths of light emitted by the scintillator.

3. The method of claim 1 , further comprising applying a reflective coating to a surface of the interior cavity prior to flowing the amorphous scintillator material into the interior cavity.

4. The method of claim 1 , wherein the light emitted by the scintillator has a peak emission wavelength of between 400 nanometers and 600 nanometers.

5. The method of claim 1 , further comprising:
providing a second mold, the second mold having a second interior cavity;
flowing the amorphous scintillator material into the second interior cavity of the second mold;
cooling the amorphous scintillator material within the second interior cavity to form a second scintillator; and
coupling the second mold to the photodetector such that the photodetector receives second light that is emitted by the second scintillator responsive to incidence of radiation at the second scintillator.

6. The method of claim 5 , wherein the photodetector comprises a first cell and a second cell, the method further comprising:
aligning the first cell of the photodetector with the scintillator such that the light emitted by the scintillator is received by the first cell but is not received by the second cell; and
aligning the second cell of the photodetector with the second scintillator such that the second light emitted by the second scintillator is received by the second cell but is not received by the first cell.

7. The method of claim 1 , wherein the interior cavity has an interior surface, the method further comprising coating the interior surface of the interior cavity with a reflective coating, where the reflective coating has a reflectivity of greater than 90% with respect to the light emitted by the scintillator.

8. The method of claim 1 , wherein the photodetector is one of a silicon photomultiplier (SIPM) or a charge-coupled device (CCD).

9. The method of claim 1 , where the amorphous scintillator material comprises the plasticizer additive, and further where the plasticizer additive is a compound that comprises boron.

10. The method of claim 9 , wherein the compound comprising boron is one of:
boronic pinacol esters;
2-(p-tolyl)-1,3,2-dioxaborinane (TDB);
1,3,5-tris (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) benzene (‘1,3,5-TrBB’);
2,2′,2″-(benzene-1,2,4-triyl) tris (4,4,5,5-tetramethyl-1,3,2-dioxaborolane) (‘1,2,4-TrBB’); and
1,2,4,5-tetrakis (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) benzene (TBB).

11. The method of claim 1 , wherein the amorphous scintillator material further comprises a polymer.

12. A system comprising:
a photodetector that comprises a first photosensitive cell and a second photosensitive cell;
a frame that defines a first interior cavity and a second interior cavity, wherein the first interior cavity and the second interior cavity are separated from one another, and wherein the first interior cavity is aligned with the first photosensitive cell and the second interior cavity is aligned with the second photosensitive cell;
a first scintillator element positioned within the first interior cavity, the first scintillator element comprising an organic glass scintillator (OGS) material and a plasticizer additive or a polymer, wherein the plasticizer additive is present in the first scintillator element at a concentration of between 1 % and 10 % of a mass of the first scintillator element; and
a second scintillator element positioned within the second interior cavity, where:
the first interior cavity and the first photosensitive cell are aligned such that first light emitted by the first scintillator element is received by the first scintillator cell but is not received by the second scintillator cell; and
the second interior cavity and the second photosensitive cell are aligned such that second light emitted by the second scintillator element is received by the second scintillator cell but is not received by the first scintillator cell.

13. The system of claim 12 , where the plasticizer additive is one of:
mesitylene;
pseudocumene;
ethylbenzene;
cumene;
p-Cymene; or
1-Phenylhexane.

14. The system of claim 12 , wherein the second scintillator element comprises the OGS material and the plasticizer additive.

15. The system of claim 14 , wherein the plasticizer additive is present in the second scintillator element at a concentration of between 1% and 10% of a mass of the second scintillator element.

16. The system of claim 12 , where the first scintillator element additionally includes a polymer.

17. The system of claim 12 , wherein the first interior cavity is coated with a reflective coating and the second interior cavity is coated with the reflective coating.

18. A system for making a radiation detector, the system comprising:
a photodetector;
a mold that has an interior cavity;
amorphous scintillator material, where the interior cavity of the mold is configured to receive the amorphous scintillator material, and further where the amorphous scintillator material comprises an organic glass scintillator (OGS) material and a plasticizer additive, wherein the plasticizer additive is present in the amorphous scintillator material at a concentration of between 1% and 10% of a mass of the amorphous scintillator material, where the amorphous scintillator material is cooled within the interior cavity to form a scintillator, and further where the mold is coupled to the photodetector such that the photodetector receives light that is emitted by the scintillator responsive to incidence of radiation at the scintillator.

19. The system of claim 18 , where the amorphous scintillator material comprises the plasticizer additive, and further where the plasticizer additive is a compound that comprises boron.

20. The system of claim 18 , wherein the amorphous scintillator material further comprises a polymer.

Assignees

• Nat Tech & Eng Solutions Sandia Llc

Inventors

• Carlson Joseph
• Feng Patrick L
• Myllenbeck Nicholas
• Tran Huu
• Nguyen Lucas
• Sweany Melinda
• Marleau Peter

Classifications

• H10F39/1898 Primary

  Indirect radiation image sensors, e.g. using luminescent members · CPC title

• H10F39/014

  of CMOS image sensors · CPC title

• G01T1/2033

  Selection of materials · CPC title

• G01T1/2018 Primary

  Scintillation-photodiode combinations · CPC title

• H01L27/14689

  Electricity · mapped topic