Calcium-41 (41Ca)
Calcium-41 (41Ca) is a rare long-lived radio-isotope of Calcium. Calcium-41 is called a cosmogenic nuclide, because it is created by energetic cosmic rays impacting matter in a fission reaction, called spallation.
| half-life (λ) | 100,000y |
|---|---|
| Protons | 20 |
| Neutrons | 21 |