Radioactive Decay Calculations
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Question 1 of 10
1. Question
If you started with 50 mg of radioactive radon how much radon would be left after three half-lives?
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Question 2 of 10
2. Question
What percentage of a radioactive atom will have decayed after 2 half-lives?
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Question 3 of 10
3. Question
If an atom has a half-life of 54 days and it has been decaying for 220 days then it has undergone approximately:
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Question 4 of 10
4. Question
If Co-60 has a half-life of 5.3 years how much of a 500g Co-60 sample would be left after 21.2 years?
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Question 5 of 10
5. Question
Carbon-14 has a half-life of around 6,000 years. After 24,000 years how much of a 2,000 g sample will have decayed?
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Question 6 of 10
6. Question
A radioactive substance had a decay activity of 200 counts/min if it had a decay activity of 50 counts/min 3 hours later what is the half life of the substance?
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Question 7 of 10
7. Question
Mo-99 is used to generate Tc-99 the most commonly used radioisotope in all nuclear medicine procedures. If Mo-99 has a half-life of 66 days and the typical dose of Tc-99 used in a lung scan is 22 mRad/mCi. What is the approximate minimum amount to time it would take for a 30 mRad/mCi sample of Mo-99 to decay into enough Tc-99 to be used in a single lung scan?
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Question 8 of 10
8. Question
A radioactive isotope of sulfur has a half-life of 27 minutes. If 22 g of the radioactive isotope remained after 54 minutes of decay then the original sample contained how many grams of radioactive sulfur?
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Question 9 of 10
9. Question
Myocardial perfusion imaging (MPI) uses Thallium-201 chloride for the detection and prognosis of coronary artery disease. If 23% of the original activity of Thallium-201 remains and the half-life of Thallium-201 is 73 hours approximately how many hours have elapsed since the sample first started decaying?
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Question 10 of 10
10. Question
What fraction of sample of radioactive phosphorus would remain after 10 half lives?
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Every time we have a half-life (represented by an arrow) we have been halving the total amount of previous sample. What does this suggest about the underlying math? Think in terms of raising something to an exponent.