Posted by **Charley** on Tuesday, March 6, 2007 at 7:00am.

The isotype caesium -137, which has a half life of 30 years, is a product of nuclear power plants. How long will it take for the amount of this isotype in a sample of caesium to decay to one-sixteenth of its original amount?

first half life 1/2

second 1/4

third 1/8

fourth 1/16

so how long is four half-lives?

120 years

30=1/2

60=1/4

90=1/8

120=1/16

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