cesium 137 (noun)

1. Why did the radioactive isotope of cesium go to therapy? Because it wanted to become a better element!

2. In 1987, the Chernobyl disaster occurred, releasing a significant amount of cesium 137 into the environment.

3. In the comic strip, the scientist accidentally spilled cesium 137, turning himself into a superhero.

4. The artist created a stunning sculpture using cesium 137 as a medium, representing the power and danger of radiation.