Samples from four different radioactive isotopes all emit radiation at the same rate. Over time, the emission rates fall for every sample. Which isotope sample shows the largest reduction in rate?
- Aamericium-241, half-life 470 years
- Biodine-128, half-life 25 minutes
- Cthoron-220, half-life 54.5 seconds
- Duranium-237, half-life 6.75 days