When will it be necessary to replace the coblat


Cobalt-60 has a halflife of 5.26 yr. The cobalt-60 in a radio therapy unit must be replaced when its radioactivity falls 75% of the original sample. If the original sample was purchased in August 2006, when will it be necessary to replace the coblat-60?

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Chemistry: When will it be necessary to replace the coblat
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