cobalt 58

co·balt 58 (58Co),

Positron emitter with half-life of 70.88 days.
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Levels of cesium-134 were 24.8 times higher and those of cesium-137 16.5 times higher while a trace amount of cobalt 58 was detected in a sample of seawater taken from near the plant.
Japan's science ministry said in late September that it has detected cobalt 58 and cobalt 60 in sea water near the port where the submarine was docked, although their amounts were extremely small and have not affected the surrounding environment or people.
Cobalt 60 is used for medical or industrial purposes, but cobalt 58 has no such uses and is short-lived.