Isotope
Length of Half-Life
Ruthenium-97
2.89 days
Tin-119
293 days
Antimony-116
1.00 hour
Samarium-157
8.0 minutes
Europium-142
2.4 seconds
Lead-202
53,000 years
- You have a sample of 263 grams of Ruthenium-97. How much of the sample remains after 14.45 days?
- You have 865.3 grams of Tin-119. How much of your sample remains after 879 days?
- You allow a sample of Antimony-116 to decay for 6 hours. If the original sample contains 2.5 grams of Antimony-116, how much remains?
- You have 600 grams of Samarium-157 that you allow to decay for 16 minutes. How much of the sample remains at the end of the 16 minutes?
- You allow a sample of Europium-142 to decay for 9.6 seconds. How much of a 4.33 gram sample remains at the end of this time?
- Lead-202 has a very long half-life! If you allow a 5.2 gram sample of Lead-202 to decay for 159,000 years, how much of the original sample remains?