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View Full Version : How long will it take 1200g out of 1600 of this isotopes to decay


radz248
Feb 27, 2011, 02:05 PM

jcaron2
Feb 27, 2011, 06:41 PM
It will take two half-lives. If the half-life of your isotope is 1 hour, it will take 2 hours. If the half-life is 2000 years, it will take 4000 years.

\frac{1600-1200}{1600}=\frac 14

log_{1/2}\; (\frac 14) = 2