Radiation dosimetry sol or gel and radiation dosimeter comprising same as material for radiation dosimetry

Patent metadata

Field	Value
Publication number	US-11150358-B2
Application number	US-201816753244-A
Country	US
Kind code	B2
Filing date	Oct 1, 2018
Priority date	Oct 2, 2017
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A radiation dosimetry sol or gel, and a radiation dosimeter containing the sol or the gel as a material for radiation dosimetry. A radiation dosimetry sol or gel including a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; and a silicate salt (B). A radiation dosimetry sol or gel including a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; a silicate salt (B); a water-soluble organic polymer (C) having an organic acid salt structure or an organic acid anion structure; and a dispersant (D) for the silicate salt (B). A radiation dosimeter including, as a material for radiation dosimetry, the above-mentioned radiation dosimetry sol or gel.

First claim

The invention claimed is:

1. A radiation dosimetry sol or gel characterized by comprising a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; and a silicate salt (B).

2. The radiation dosimetry sol or gel according to claim 1 , wherein the compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water is one or more selected from the group consisting of a coumarin derivative, an aromatic carboxylic acid derivative, an oxazole derivative, and a rhodamine compound.

3. The radiation dosimetry sol or gel according to claim 1 , wherein the silicate salt (B) is particles of one or more water-swellable silicate salts selected from the group consisting of smectite, bentonite, vermiculite, and mica.

4. The radiation dosimetry sol or gel according to claim 1 , characterized by further comprising a water-soluble organic polymer (C) having an organic acid salt structure or an organic acid anion structure; and a dispersant (D) for the silicate salt (B).

5. The radiation dosimetry sol or gel according to claim 4 , wherein the water-soluble organic polymer (C) is a completely neutralized or partially neutralized polyacrylic acid salt.

6. The radiation dosimetry sol or gel according to claim 4 , wherein the dispersant (D) is one or more selected from the group consisting of sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate, sodium tetraphosphate, sodium hexametaphosphate, sodium polyphosphate, sodium poly(meth)acrylate, ammonium poly(meth)acrylate, a sodium acrylate/sodium maleate copolymer, an ammonium acrylate/ammonium maleate copolymer, sodium hydroxide, hydroxylamine, sodium carbonate, sodium silicate, polyethylene glycol, polypropylene glycol, sodium humate, and sodium ligninsulfonate.

7. The radiation dosimetry sol or gel according to claim 1 , wherein the radiation dosimetry sol or gel further comprises a pH adjuster.

8. A radiation dosimeter comprising, as a material for radiation dosimetry, the radiation dosimetry sol or gel according to claim 1 .

9. The radiation dosimeter according to claim 8 , wherein the radiation dosimeter is used for an optical CT system.

Assignees

• Riken
• The Kitasato Inst
• Nissan Chemical Corp

Inventors

• Maeyama Takuya
• Sahade Daniel Antonio
• Takanashi Takaoki

Classifications

• C09K11/06

  containing organic luminescent materials · CPC title

• G01T1/04

  Chemical dosimeters (G01T1/06, G01T1/08 take precedence) · CPC title

• G01T1/105 Primary

  Read-out devices (G01T1/115 takes precedence) · CPC title

• G21K2004/08

  with a binder in the phosphor layer · CPC title

• G01N21/64

  Fluorescence; Phosphorescence · CPC title