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

Patent metadata

Field	Value
Publication number	US-10031241-B2
Application number	US-201515537456-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	Dec 19, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A radiation dosimetry gel is excellent in heat resistance, and a radiation dosimeter includes the radiation dosimetry gel as a material for measuring a radiation dose. A radiation dosimetry gel includes a water-soluble organic polymer (A) having an organic acid salt structure or an organic acid anion structure, a silicate (B), and a dispersant (C) for the silicate, and a radiation dosimeter includes the radiation dosimetry gel as a material for measuring a radiation dose.

First claim

The invention claimed is:

1. A radiation dosimetry gel characterized by comprising a water-soluble organic polymer (A) having an organic acid salt structure or an organic acid anion structure, a silicate (B), and a dispersant (C) for the silicate.

2. The radiation dosimetry gel according to claim 1 , wherein the water-soluble organic polymer (A) is a fully neutralized or partially neutralized polyacrylate having a weight average molecular weight of 1,000,000 to 10,000,000.

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

4. The radiation dosimetry gel according to claim 1 , 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 poly(meth)acrylate, ammonium poly(meth)acrylate, sodium acrylate/sodium maleate copolymer, ammonium acrylate/ammonium maleate copolymer, sodium hydroxide, hydroxylamine, sodium carbonate, sodium silicate, polyethylene glycol, polypropylene glycol, sodium humate, and sodium ligninsulfonate.

5. The radiation dosimetry gel according to claim 1 , further comprising a compound (D) having a divalent or higher positive charge.

6. The radiation dosimetry gel according to claim 5 , wherein the compound (D) is one or more compounds selected from the group consisting of compounds containing group II elements, compounds containing transition elements, compounds containing amphoteric elements, and compounds containing polyamines.

7. The radiation dosimetry gel according to claim 1 , comprising a radiation polymerizable monomer.

8. The radiation dosimetry gel according to claim 1 , comprising iron(II) ions or iron(III) ions, or both.

9. The radiation dosimetry gel according to claim 1 , comprising a radiosensitive pigment.

10. The radiation dosimetry gel according to claim 1 , comprising a deoxidizer.

11. The radiation dosimetry gel according to claim 1 , comprising a pH adjuster.

12. A radiation dosimeter comprising the radiation dosimetry gel according to claim 1 as a material for measuring a radiation dose.

Assignees

• Riken
• Nissan Chemical Ind Ltd

Inventors

• Maeyama Takuya
• Fukunishi Nobuhisa
• Ishikawa Kenichi
• Ishida Yasuhiro
• Aida Takuzo
• Fukasaku Kazuaki
• Kudo Yoshihiro
• MONMA Souichi

Classifications

• C08L33/06

  of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical · CPC title

• G01T1/167 Primary

  Measuring radioactive content of objects, e.g. contamination (whole body counters G01T1/163) · CPC title

• C08K3/08

  Metals · CPC title

• G01T1/04 Primary

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

• C08K3/34

  Silicon-containing compounds · CPC title