Half-life.

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Presentation transcript:

Half-life

Half-life The time it takes for one half of a sample to undergo radioactive decay Half-lives vary in length depending on the isotope

Half-life Problems Assuming you have 100% of a sample this is the % left after each half-life.

If you have a 200g sample of a radioisotope which has a half-life of 30 years, how much will remain after 150 years?

Gold-191 has a half-life of 12. 4 hours Gold-191 has a half-life of 12.4 hours. What mass of this isotope would remain after 49.6 hours if you started with a 7.50mg sample of pure 191Au?

What is the half-life of an unknown material if 0 What is the half-life of an unknown material if 0.195% remains after 2304 years?

If you have a 200g of a radioisotope left after 40years, how much did you start with if the half-life of the isotope is 10 years?

If you have a sample of a radioisotope that has a half-life of 15 years, how many years will have passed when 6.25% remains?

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