Half life chemistry5/29/2023 ![]() In reality, radiation decays to 0.01% after ten half lives. Theoretically, a radioactive substance should emit radiation for infinite period of time. If a radioactive nucleus starts with 100 g or 100 molecules ( 100%) amount, after each half-life the amount gets decreased to half.ฤก st half life 2 nd half life 3 rd Half life The diagram below shows the exponential plot of percentage of radioactive isotopes versus remaining vs. There is no way to speed up or slow down this natural process. ![]() The value can be from fractions of a second to billions of years. The half life of an isotope is a physical property. Knowing the half life and amount of radioactive substance, one can calculate how much sample remains after a period of time. The half life is the time it takes for one half of a radioactive sample to decay.
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