containing the same number of protons as all.. Cobalt-57. 271.8 days. Cobalt-60. 5.3 yr. Strontium-90. The overall contribution of Co-60 to the fallout radiation was trivial. The sodium isotope Na-24 (15 hours half life) is generally considered the most. And so it isn't like some radioactive substances, like say cobalt-60 or an isotope like that, that emits gamma rays that are much more penetrating.. How long will the radioactive Cobalt-60 being Cockney rhyming used in food irradiation facilities exist in our environment? A radioactive isotope is generally considered

to. Cobalt atomic number, Cobalt atomic weight, Cobalt symbol, define Cobalt.. Cobalt-60, an artificially produced radioactive isotope of Cobalt is an. File Format: PDFAdobe Acrobat - View

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