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April 20, 2014

Homework Help: Science - Radiation

Posted by Manu on Saturday, January 26, 2013 at 6:29pm.

A radioactive isotope, used in the agricultural industry has a half life of 8 days. On application, the radiation is emitted is measured at 12500 counts per sec (cps). If the area that it is applied to cannot be used until the radiation strength is less than 50 cps how long will it take before the site can be used again? (Hint assume initial strength is 100%)

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