DETAILED DESCRIPTION We claim: 1.
A carbon dioxide detector which comprises an indicating member comprising an intimate mixture of a polymer vehicle and a carbon dioxide sensing medium comprising an anionic fluorimetric dye and a lipophilic organic quaternary cation.
2.
A detector according to claim 1, wherein said fluorimetric dye comprises any of 1,3-dihydroxypyrene-6,8-disulphonate,fluorescein,umbelliferone,4-methylumb elliferone,3-benzothiazoylbelliferone, 7-hydroxycoumarin-3-carboxylic acid, 1-naphthol-2-sulphonate, 1-naphthol-4-sulphonate, 2-naphthol-6-sulphonate, 7-hydroxyflavone, 7-hydroxyisoflavone, 3-hydroxyxanthone, 3,6-dihydroxyxanthone, 7-hydroxy-4-methylchromon, 7-hydroxylepidone, 3-hydroxyxacridone, harmol methoiodide, salicylaldehyde semicarbazone and 2-hydroxycinnamic acid.
3.
A detector according to claim 1, wherein said fluorimetric dye comprises 1-hydroxy-3,6,8-trisulphonate.
4.
A detector according to claim 1, wherein said indicating member is in the form of a film provided on a substrate.
5.
A detector according to claim 4, wherein said film has a thickness of about 20 microns.
6.
A detector according to claim 1, which consists of gamma-ray sterilisable materials.
7.
A detector according to claim 1, wherein said polymer vehicle comprises any of polyvinyl butyral, polyvinyl methyl ether, polymethyl methacrylate, ethyl cellulose and polystyrene.
8.
A detector according to claim 1, wherein said polymer vehicle comprises any of hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, polyethylene glycol, polyvinyl alcohol and polypropylene glycol.
9.
A detector according to claim 1, wherein said polymer vehicle contains a plasticiser.
10.
A detector according to claim 9, wherein said plasticiser comprises any of tributyl phosphate, triethyl phosphate, tris butoxyethyl phosphate, diisopropyl phthalate, diethylhexyl sebacate, and p-toluene sulphonamide.
11.
A detector according to claim 9, wherein said plasticiser comprises any of glycerine, trimethylolpropane and low molecular weight polyethylene glycol
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