This paper describes a method for preparing a circular planar source of 17mm diameter containing approximately 400 kBq of ¹⁴⁷Pm employing a wetchemical deposition technique to be used in dust monitors. This manuscript described the over all process concept and experimental procedure. The technical feasibility, efficiency of the process and product quality has been evaluated. The quality of the prepared source in terms of nonleachability, uniform distribution of activity and stability, which are necessary attributes of a radioactive source were evaluated and found to be satisfactory.