Search SEDIS
Data sets | Publications | Expeditions | Thesaurus |
He-4 ![]() | |
---|---|
BT | isotopes |
.stable isotopes | |
..He-4 | |
BT | noble gases |
.helium | |
..He-4 | |
RT | He-4/He-3 |
SN | This term has multiple hierarchies. |
He-4/He-3 ![]() | |
---|---|
BT | isotopes |
.stable isotopes | |
..He-4/He-3 | |
BT | noble gases |
.helium | |
..He-4/He-3 | |
UF | He-3/He-4 |
RT | absolute age |
isotope ratios | |
He-3 | |
He-4 | |
SN | Isotopic ratio. As of 1989, use He/He for age determination method. This term has multiple hierarchies. |