| abstract |
The invention provides a photostorage solid drawing medium comprising a solvent, a resin soluble in the solvent, a photostorage pigment and a gelling agent, wherein the photostorage pigment comprises a long afterglow fluorescent substance comprising an alkaline earth aluminosilicate as a matrix activated with a rare earth element wherein the alkaline earth element is at least one selected from the group consisting of strontium, calcium, magnesium and barium. The solvent used is a polar solvent, particularly a mixture of water and a water-soluble organic solvent, or at least one alcoholic solvent selected from the group consisting of glycols, glycol ethers, glycol ether esters and monovalent alcohols. |