The activity of a sample is 640 Bq. It's half-life is 3 hours. Calculate the percentage of activity remaining after 6 hours. Half Life
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A radioactive source has an activity of 800 Bq. It has a half-life of 4 hours. Calculate its activity after 24 hours.
The initial activity of a sample is 600 Bq. Calculate the percentage reduction in activity after 3 half-lives
The activity of a source is 680 Bq. After one full day its activity is has fallen to 85 Bq. Calculate its half-life.
Calculate the activity of the sample after 3 half-lives.
A radioactive isotope has a half-life of 3 days. It's current activity 52 Bq. Calculate its activity 9 days ago.
Which sample would have the greatest amount remaining after 1 minute?
Which sample would have the least amount remaining after 1 minute?
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If you start with a complete sample, how much of the sample is left after the third half-life?
A bone sample contains only 1/4 of its original radioactive C14 content. How old is the bone sample?
The half life of iodine-131 is 8.040 days. What percentage of an iodine-131 sample will remain after 40.20 days?
Which diagram best represents the percentage of this radioactive isotope sample that will remain after 2 half-lives?
A sample of wood that originally contained 100 grams of carbon-14 now contains only 25 grams of carbon-14. Approximately how many years ago was this sample part of a living tree?
Use the half-life graph to calculate the half-life of the sample.
Technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a patient how much remains after 18 hours?
The % of the parent isotope remaining after 3 Half Lives.
Which of the following samples would have the greatest amount remaining after 28 days?
The half-life of strontium-90 is 25 years. How much strontium-90 was originally present if 0.25 g is present in a sample after 100 years?
After the third half-life, how much of the sample is left?