I must have gotten mixed up. The wiki page has enough info rectify it. 5 year half life beta emitter is definitely serious. https://en.wikipedia.org/wiki/Cob

I must have gotten mixed up. The wiki page has enough info rectify it. 5 year half life beta emitter is definitely serious. https://en.wikipedia.org/wiki/Cobalt-60 https://en.wikipedia.org/wiki/Cobalt-60