Since this is not my area of expertise, I searched Google under the key words "radioactive decay" to get these possible sources:
https://www.google.com/search?client=safari&rls=en&q=radioactive+decay&ie=UTF-8&oe=UTF-8&gws_rd=ssl
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
How a radioactive element will decay over time?
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