Radium-226 has a half life of 1620 years. Find the time period during which a given mass of this material is reduced by one-quarter.

Q= Ce^-rt should be the right equation?

Stumped on how to set this up.

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- February 21st 2011, 10:40 PMdmbocciRadioactive decay
Radium-226 has a half life of 1620 years. Find the time period during which a given mass of this material is reduced by one-quarter.

Q= Ce^-rt should be the right equation?

Stumped on how to set this up. - February 21st 2011, 11:45 PMCaptainBlack