Isotope dating of rocks and minerals relies on precise measurement of isotope ratios. Enriched isotopes serve as isotope dilution spikes and as mass spectrometry standards.
| Isotope | Element | Enrichment, at.% | Application |
|---|---|---|---|
| ²⁰⁴Pb | Lead | 87.00 | isotope dilution and geochronology (common-lead correction) |
| ²⁰⁶Pb | Lead | 98.60 | isotope dilution, geochronology (U–Pb method) |
| ²⁰⁷Pb | Lead | 98.10 | NMR (²⁰⁷Pb nucleus), isotope dilution, geochronology |
| ¹⁴³Nd | Neodymium | 97.60 | geochronology and isotope geochemistry (¹⁴³Nd/¹⁴⁴Nd ratio) |
| ¹⁵⁰Nd | Neodymium | 98.40 | double beta decay searches, isotope dilution (spikes) |
| ¹⁴⁷Sm | Samarium | 96.80 | geochronology (Sm–Nd method) |
| ¹⁴⁹Sm | Samarium | 97.50 | strong neutron absorber, isotope dilution |
| ¹⁷⁶Lu | Lutetium | 88.20 | target for reactor production of lutetium-177 (radionuclide therapy), geochronology (Lu–Hf method) |
| ¹⁷⁶Hf | Hafnium | 85.20 | geochronology (¹⁷⁶Hf/¹⁷⁷Hf ratio) |
| ¹⁷⁷Hf | Hafnium | 94.30 | geochronology, isotope dilution |
| ¹⁸⁷Re | Rhenium | 99.60 | target for rhenium-188 production (therapy), geochronology (Re–Os method) |
| ⁸⁷Rb | Rubidium | 99.00 | atomic clocks and frequency standards, laser cooling, Bose–Einstein condensation, rubidium–strontium dating |
| ⁸⁶Sr | Strontium | 96.90 | target for yttrium-86 production (PET), isotope dilution in geochemistry |
| ⁸⁷Sr | Strontium | 94.40 | optical atomic clocks, geochronology (Rb–Sr method) |
| ¹³⁸La | Lanthanum | 11.00 | primordial long-lived radionuclide: lanthanum–cerium and lanthanum–barium dating |
| ⁴⁰K | Potassium | 8.90 | primordial long-lived radionuclide (T½ ≈ 1.25 billion years): potassium–argon dating, calibration, research |
| ³⁴S | Sulfur | 69.10 | tracer in sulfur cycle studies, geochemistry and ecology |
| ¹⁴²Ce | Cerium | 96.80 | double beta decay research, isotope dilution |
Reference information on typical applications. Enrichment is given according to the producer’s specification. Please confirm the suitability of the isotope for your task (enrichment, chemical form, quantity) in your request. Export of isotope products is subject to export control requirements.