Preparation process of 103Pd sealed seed source core

The invention belongs to the technical field of medical preparations containing radioactive substances, in particular to a preparation process of a palladium [103Pb] sealed seed source core used for medical treatment. The process sequentially comprises the following two steps of: (1) dipping a silver stick into a palladium chloride solution, then taking out and washing by using water; dipping the silver stick into an alkaline ammonia solution of hydrazine, taking out and washing clean by using water; and (2) putting the silver stick in a mixed solution containing palladium chloride, ethylene diamine tetraacetic acid, ammonium hydroxide and hydrazine, and stirring for reacting in the presence of water bath heating to ensure that a layer of 103Pd is uniformly covered on the surface of the silver stick. The preparation process has the advantages of low production cost, no environmental pollution, uniform and dense distribution of the 103Pd on the surface of the silver stick, high utilization ratio of the 103Pd,