Question
Which radioactive isotope would take the least amount of time to become stable?
rubidium-91
iodine-131
cesium-135
uranium-238
Answers
GPT-4o mini
To determine which radioactive isotope would take the least amount of time to become stable, we need to look at their half-lives, which is the time it takes for half of a given amount of the isotope to decay.
Here are the half-lives of the isotopes you mentioned:
1. **Rubidium-91**: Approximately 18.6 minutes.
2. **Iodine-131**: Approximately 8 days.
3. **Cesium-135**: Approximately 2.3 million years.
4. **Uranium-238**: Approximately 4.5 billion years.
Among these isotopes, **Rubidium-91**, with a half-life of about 18.6 minutes, would take the least amount of time to become stable.
Here are the half-lives of the isotopes you mentioned:
1. **Rubidium-91**: Approximately 18.6 minutes.
2. **Iodine-131**: Approximately 8 days.
3. **Cesium-135**: Approximately 2.3 million years.
4. **Uranium-238**: Approximately 4.5 billion years.
Among these isotopes, **Rubidium-91**, with a half-life of about 18.6 minutes, would take the least amount of time to become stable.