Across
- 3. is the rate of decay of a radioactive isotope.
- 4. the higher altitude the more blank radiation.
- 6. no charge.
- 9. The strong nuclear force is a very distance-sensitive attraction between.
- 11. results from radioactive decay.
Down
- 1. The presence of neutrons helps hold this together.
- 2. carries a Negative electrical charge.
- 5. Cosmic rays have one of two types of high - what particles.
- 7. carries a positive electrical charge.
- 8. Radioactivity has existed longer than the what race.
- 10. most radiation we encounter is from what background.