Resin/phosphor composite scintillator, and scintillator array

Patent metadata

Field	Value
Publication number	US-2022002617-A1
Application number	US-202117476874-A
Country	US
Kind code	A1
Filing date	Sep 16, 2021
Priority date	Mar 19, 2019
Publication date	Jan 6, 2022
Grant date	—

Abstract

The present invention addresses the problem of providing a scintillator which has excellent impact resistance and favorable workability and moldability. The problem is solved by a resin-phosphor composite scintillator which contains a resin and a phosphor and is capable of converting irradiated radiation into visible light. In this composite scintillator, a brightness retention rate, which is measured 24 hours after 38-minute irradiation with an X-ray to a total irradiation dose of 13 kGy at a distance of 40 mm from a radiation source, is 65% or higher; the Rockwell hardness is 30 HRM or higher; and the content of the resin is not less than 10% by weight.

First claim

1 . A resin-phosphor composite scintillator, comprising:
a resin; and a phosphor; wherein: the scintillator is capable of converting irradiated radiation into visible light a brightness retention rate of the scintillator, when measured 24 hours after 38-minute irradiation with an X-ray to a total irradiation dose of 13 kGy at a distance of 40 mm from a radiation source, is 65% or higher; a Rockwell hardness of the scintillator is 30 HRM or higher; and a content of the resin in the scintillator is not less than 10% by weight.

2 . The composite scintillator according to claim 1 , which is in the form of a plate having a thickness of 500 μm or greater.

3 . The composite scintillator according to claim 1 , wherein the resin is a cured product obtained using a cationic polymerization initiator.

4 . The composite scintillator according to claim 1 , wherein the resin has an epoxy equivalent of 190 or more.

5 . The composite scintillator according to claim 1 , wherein the resin comprises a cyclic structure which contains no double bond.

6 . The composite scintillator according to claim 1 , wherein the resin comprises at least one selected from the group consisting of a hydrogenated epoxy resin and an epoxy silicone resin.

7 . The composite scintillator according to claim 1 , wherein a content of the phosphor in the scintillator is 30% by weight to 90% by weight.

8 . The composite scintillator according to claim 1 , wherein the scintillator exhibits an afterglow of 100 ppm or less after 20 ms when irradiated with a 16-Gy X-ray.

9 . The composite scintillator according to claim 1 , wherein the phosphor comprises at least one selected from the group consisting of a GOS phosphor, a CWO phosphor, a CsI phosphor, and a GAGG phosphor.

10 . The composite scintillator according to claim 1 , wherein the phosphor is in the form of particles.

11 . The composite scintillator according to claim 1 , wherein the phosphor has an average particle size of 0.1 μm to 50 μm.

12 . A composite scintillator array, comprising a plurality of composite scintillators according to claim 1 , wherein:
the scintillators are arranged linearly in the array, each scintillator has a size of 10 mm 3 or smaller.

Assignees

• Mitsubishi Chem Corp

Inventors

• Kuriwada Takeshi
• Oomori Takeshi
• Kurushima Tomoyuki

Classifications

• C09K11/7771 Primary

  Oxysulfides · CPC title

• G01T1/2033

  Selection of materials · CPC title

• G01T1/2023

  Selection of materials · CPC title

• C09K11/02 Primary

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C09K11/68

  containing chromium, molybdenum or tungsten · CPC title