This paper describes an indigenous method for development and deployment of rechargeable liquid filled phantom with newly proposed radionuclide ¹⁴¹Ce for determination of extrinsic uniformity of gamma cameras. Details about design of phantom, neutron irradiation of cerium targets, chemical processing of ¹⁴¹Ce, charging of phantom with ¹⁴¹Ce solution and their performance evaluation are presented. Suitability of ¹⁴¹Ce in quality assurance of gamma cameras used in in-vivo diagnostic imaging procedures has been amply demonstrated.