Assertion: cobalt's permeability | /r/HasProperty | studied with the aid of radioactive cobalt
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text: for example, 56Co (T ½ = 77 days), 57Co (270 days), and 58Co (72 days), which are less harmful because of their short half-life—are used as isotope tracers in the study of metabolism, particularly in studying the distribution of cobalt in the bodies of animals (for example, the permeability of the placenta was studied with the aid of radioactive cobalt).