The excretion kinetics of Ag-110m in a gastropod species contaminated through water pathway has been studied under laboratory condition. The pattern of the excretion results can be represented by a monophasic linear regression function. The excretion coefficient and biological half-life were calculated. The biological half-life was found to be 33 days. The study suggests that the excretion rate of Ag-110m by N intricata may be considered as a potential biomonitor on the shoreline of the Black Sea marine environment.