La vida media radiactiva

The video tutorial explains how radioactive decay makes substances stable by changing their nuclei and emitting radiation. It uses molybdenum-99 as an example, which decays into technetium and then into stable ruthenium-99. The concept of half-life is introduced, explaining how it helps determine when a radioactive substance becomes safe. The half-life of molybdenum-99 is about 3 days, and understanding this helps in safely storing radioactive waste until it poses no health risk.

What happens to the amount of molybdenum-99 after 3 days?

Describe the significance of knowing the half-life of radioactive materials.