Phosphor consisting of hollow particles, phosphor slurry, phosphor beads for analysis using tracer technique and their production processes

A process for producing a phosphor consisting of hollow particles, which comprises spraying a solution containing metal elements constituting the phosphor into a carrier gas to obtain fine droplets, and drying the fine droplets to form hollow particles, followed by thermal decomposition.

Phosphor beads for analysis using tracer technique to be used to determine an organic substance, a reactant which reacts with the organic substance, or a substance inhibiting the binding of the organic substance to the reactant, by utilizing the binding of the organic substance to the reactant, wherein either the organic substance or the reactant is fixed to a radioactive labeled compound and the other is fixed to the phosphor beads, said phosphor beads being spherical or substantially spherical hollow particles, each hollow particle having a median particle size of from 0.01 to 10 μm.

Phosphor beads for analysis using tracer technique to be used to determine an organic substance, a reactant which reacts with the organic substance, or a substance inhibiting the binding of the organic substance to the reactant, by utilizing the binding of the organic substance to the reactant, wherein either the organic substance or the reactant is fixed to a radioactive labeled compound and the other is fixed to the phosphor beads, said phosphor beads being spherical or substantially spherical solid particles, each solid particle having a median particle size of from 0.01 to 8 μm.