| title | header | last_modified_at | ||
|---|---|---|---|---|
Lanthanum-138 |
|
2022-08-08 13:45:00 +0200 |
Naturally occurring lanthanum (57La) is composed of one stable (139La) and one radioactive (138La) isotope, with the stable isotope, 139La, being the most abundant (99.91% natural abundance). There are 38 radioisotopes that have been characterized, with the most stable being 138La, with a half-life of 1.02×1011 years; 137La, with a half-life of 60,000 years and 140La, with a half-life of 1.6781 days. The remaining radioactive isotopes have half-lives that are less than a day and the majority of these have half-lives that are less than 1 minute.
Spectrum (Fullscreen)
Spectrum of a sample of La-(III)-oxide. 5 minute measurement with a High Purity Germanium (HPGe) radiation detector.
| Isotope: | Lanthanum |
|---|---|
| Mass number: | 138 |
| Atomic number: | 57 |
| Neutron number: | 81 |
| ... | ... |