| Properties: | |
| Half-life 21.5 days; radiation β and γ. | |
| Derivation: | |
| From cerium-140 by capture of a neutron and emission of a γ photon. | |
| Available Forms: | |
CeCl3 in hydrochloric acid solution. | |
| Hazard: | |
| Radioactive poison. | |
| Use: | |
| Biological and medical research. | |
Radioactive cerium of mass number 141.