# US 11,442,181 B2 · Gel forming composition for radiation dosimetry and radiation dosimeter using gel that is formed from said composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,181 B2 - Document ID: US11442181B2 - Status: Granted - Kind: B2 - Application number: 16/307,073 - Filed: 2017-06-19 - Published: 2019-05-16 - Granted: 2022-09-13 - Earliest claimed: 2016-06-22 - Assignees: Riken; Nissan Chemical Corporation - Applicants: Riken; Nissan Chemical Corporation - Inventors: Takuya Maeyama; Kazuaki Fukasaku; Yasuhiro Ishida; Yoshihiro Kudo - Web page: https://patentgrep.com/patent/US11442181B2 ## CPC - G01T 1/04: Chemical dosimeters (G01T1/06, G01T1/08 take precedence) - C08F 220/56: Acrylamide; Methacrylamide - C08K 3/34: Silicon-containing compounds - C08K 5/20: Carboxylic acid amides - C08L 5/00: Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00 - C08L 5/04: Alginic acid; Derivatives thereof - C08L 5/08: Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof - C08L 5/12: {Agar or} agar-agar {, i.e. mixture of agarose and agaropectin}; Derivatives thereof - C08L 33/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof - C08L 89/06: derived from leather or skin {, e.g. gelatin} - G01T 1/02: Dosimeters (G01T1/15 takes precedence) - G01T 1/16: Measuring radiation intensity (G01T1/29 takes precedence {; self-powered detectors G01T3/006; using an ionisation chamber filled with a liquid or solid, e.g. frozen liquid, dielectric G01T3/008}) - G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A gel forming composition for radiation dosimetry, and a high sensitivity and high safety radiation dosimeter using a gel formed from the composition. A gel forming composition for radiation dosimetry comprising a gelator and a compound of Formula (1): (wherein R1 is a hydrogen atom, a halogen atom, an optionally substituted C1-12 alkyl group, etc.; and R2 and R3 are each independently a hydrogen atom, an optionally substituted C1-12 alkyl group, an optionally substituted monovalent C6-12 aromatic group, or R2 and R3 form a 4- to 8-membered ring together with a carbon atom to which R2 and R3 are bonded, and the 4-to 8-membered ring may have 0 to 3 nitrogen atoms, oxygen atoms, or sulfur atoms as a ring atom, provided that R2 and R3 are not simultaneously a hydrogen atom). ## Claims ### Claim 1 A gel forming composition for radiation dosimetry comprising a gelator and a compound of Formula (1): wherein R1 is a hydrogen atom, a halogen atom, an optionally substituted C1-12 alkyl group, an optionally substituted C1-12 alkyloxy group, an optionally substituted C1-12 alkylthio group, an optionally substituted monovalent C6-12 aromatic group, or a monovalent C3-12 heteroaromatic group having at least one of a nitrogen atom, an oxygen atom, or a sulfur atom as a ring atom; and R2 and R3 are each independently a hydrogen atom, an optionally substituted C1-12 alkyl group, an optionally substituted monovalent C6-12 aromatic group, or a monovalent C3-12 heteroaromatic group having at least one of a nitrogen atom, an oxygen atom, or a sulfur atom as a ring atom, or R2 and R3 form a 4- to 8-membered ring together with a carbon atom to which R2 and R3 are bonded, and the 4- to 8-membered ring optionally has 0 to 3 nitrogen atoms, oxygen atoms, or sulfur atoms as a ring atom, provided that R2 and R3 are not simultaneously a hydrogen atom, and 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 (B), and a dispersant (C) for the silicate. ### Claim 2 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, wherein in Formula (1), R2 and R3 are each independently an optionally substituted C1-12 alkyl group, an optionally substituted monovalent C6-12 aromatic group, or a monovalent C3-12 heteroaromatic group having at least one of a nitrogen atom, an oxygen atom, or a sulfur atom as a ring atom, or R2 and R3 form a 4- to 8-membered ring together with a carbon atom to which R2 and R3 are bonded, and the 4- to 8-membered ring optionally has 0 to 3 nitrogen atoms, oxygen atoms, or sulfur atoms as a ring atom. ### Claim 3 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, wherein the gelator is one or two or more selected from the group consisting of agarose, xanthan gum, carrageenan, gellan gum, chitosan, and alginic acid. ### Claim 4 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, wherein the water-soluble organic polymer (A) is a fully or partially neutralized polyacrylate having a weight average molecular weight of 1,000,000 to 10,000,000. ### Claim 5 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, wherein the silicate (B) is one or two or more water-swellable silicate particles selected from the group consisting of smectite, bentonite, vermiculite, and mica. ### Claim 6 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, wherein the dispersant (C) is one or two 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. ### Claim 7 (depends on 6) The gel forming composition for radiation dosimetry according to claim 6, further comprising a crosslinker. ### Claim 8 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, further comprising a deoxidizing agent. ### Claim 9 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, wherein the gelator additionally contains a compound (D) having a divalent or higher positive charge. ### Claim 10 (depends on 9) The gel forming composition for radiation dosimetry according to claim 9, wherein the compound (D) is at least one compound selected from the group consisting of a compound containing a group II element, a compound containing a transition metal element, a compound containing an amphoteric element, and a polyamine. ### Claim 11 (depends on 9) The gel forming composition for radiation dosimetry according to claim 9, wherein the compound (D) is a hydrochloride, sulfate, diphosphate, silicate, or aluminate of magnesium, calcium, or aluminum. ### Claim 12 (depends on 11) The gel forming composition for radiation dosimetry according to claim 11, wherein the compound (D) is, magnesium chloride, calcium chloride, magnesium sulfate, aluminum sulfate, calcium diphosphate, or magnesium aluminosilicate. ### Claim 13 (depends on 1) The gel forming composition for radiation dosimetry according to claim 1, wherein the compound of Formula (1) is not N,N-dimethylacrylamide.