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#cobalt-60
#co-60
#radioactive isotope
#cobalt blue
#nuclear
#gamma ray source
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#cobalt-60
#co-60
#isotope
#radioactive atom
#nuclear physics
#radioactivity
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#cobalt-60
#co-60
#radioisotope
#radiation therapy
#medical physics
#nuclear medicine
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#cobalt-60
#co-60
#radioactive hazard
#radiation danger
#nuclear safety
#gamma source warning
#cobalt-60 #co-60 #radioactive isotope #cobalt blue #nuclear #gamma ray source