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AgBr/I nanoparticles were prepared in a gelatin colloid medium using the double-jet precipitation method. The difference in growth behaviour of AgBr/I nanoparticles in two types of gelatin, fish gelatin and bovine gelatin, was observed, and was considered to result from differences in conformation and component contents. The average size of AgBr/I nanoparticles prepared in aqueous fish gelatin solution increased with decreasing addition rate of reactants from 4.0 mmol min-1 to 1.7 mmol min-1 or increasing precipitation temperature from 30°C to 60°C. On the basis of the dependence of the growth rate of AgBr/I nanoparticles on precipitation temperature, the activation energy of the growth rate of the nanoparticles was estimated as 20.4 kJ mol-1. The protective role of 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene (TAI) for AgBr/I nanoparticles made in aqueous fish gelatin solution was explored. The results showed that TAI was adsorbed on the surface of AgBr/I nanoparticles to restrict growth and to deflocculate particles. [ABSTRACT FROM AUTHOR]