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Co57--- used as a tracer to diagnosed pernicious anemia. Co60--- used as sterilised surgical instruments, used in cancer treatment... Food irradiation, gauges, radiography.
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Co-60 is a radioactive metal, used in radiotherapy. Cobalt - 57 is also a radioactive metal which is used in the medicals, i.e., in the medical tests. It is also useful for Schilling test.
Hope this will help you.  
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