Radiation dosimetry gel and radiation dosimeter comprising same as material for measuring radiation dose

Patent metadata

Field	Value
Publication number	US-11960038-B2
Application number	US-202017614254-A
Country	US
Kind code	B2
Filing date	May 18, 2020
Priority date	May 24, 2019
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A radiation dosimetry gel, usable in a polymer gel dosimeter having an improved sensitivity and high safety, includes a gelator, and a compound of the following Formula (1):

wherein R 1 is a hydrogen atom or a methyl group, m and n are each an integer of 2 to 4, k is 0 or 1, and a plurality of R 1 s and ms are each the same as or different from one another. Also provided for is a radiation dosimeter including the radiation dosimetry gel as a material for radiation dosimetry.

First claim

The invention claimed is:

1. A radiation dosimetry gel comprising a gelator, and a compound of the following Formula (1):

(wherein R 1 is a hydrogen atom or a methyl group;
m and n are each an integer of 2 to 4;
k is 0 or 1; and
a plurality of R 1 s and ms are each the same as or different from one another).

2. The radiation dosimetry gel according to claim 1 , wherein the radiation dosimetry gel further comprises water.

3. The radiation dosimetry gel according to claim 1 , wherein the gelator is one or more selected from the group consisting of gelatin, agarose, xanthan gum, carrageenan, gellan gum, chitosan, and alginic acid.

4. The radiation dosimetry gel according to claim 1 , wherein the gelator contains a water-soluble organic polymer (A) having an organic acid structure, an organic acid salt structure, or an organic acid anion structure, a silicate salt (B), and a dispersant (C) for the silicate salt.

5. The radiation dosimetry gel according to claim 4 , wherein the water-soluble organic polymer (A) is a completely neutralized or partially neutralized polyacrylic acid salt having a weight average molecular weight of 1,000,000 to 10,000,000.

6. The radiation dosimetry gel according to claim 4 , 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.

7. The radiation dosimetry gel according to claim 4 , wherein the dispersant (C) is one or more selected from the group consisting of sodium orthophosphate, sodium pyrophosphate, sodium tripolyphosphate, sodium tetraphosphate, sodium hexametaphosphate, sodium polyphosphate, sodium etidronate, 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.

8. The radiation dosimetry gel according to claim 1 , wherein the radiation dosimetry gel further comprises a monomer capable of being polymerized by radiation exposure.

9. The radiation dosimetry gel according to claim 1 , wherein the radiation dosimetry gel further comprises a deoxidizer.

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

11. A radiation dosimetry method comprising a step of irradiating the radiation dosimeter according to claim 10 with a radiation.

12. A method for producing a radiation dosimetry gel, the method comprising a step of mixing the gelator specified in claim 1 and a compound of Formula (1).

Assignees

• Riken
• Nissan Chemical Corp

Inventors

• Takanashi Takaoki
• Sahade Daniel Antonio
• Hamada Toshimasa

Classifications

• G01T1/04 Primary

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

• C08F2/54

  by X-rays or electrons · CPC title

• C08F20/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C08J3/075

  Macromolecular gels · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title