Redionuclides such as U,Th,Ra, and Am [1] constitute a category of heavy metals in marine environment as they become and cause serious risks to human health and ecosystem [2]. They are generated from two differant sources: 1) natural sources which yield a constant activity level and 2) artificial sources which are caused by nuclear weapon tests, nuclear accidents, nuclear power plants . nuclear waste and so on causing a variation in the radioactivity level .