The world's most reliable Stable Isotopes Supplier
| Nominal Mass |
Accurate Mass |
% Natural Abundance |
Chemical Form |
Enrichment Available % |
| 152 Gd | 151.919786 (4) | 0.20 (1) | oxide | 30 - 34+ |
| 154 Gd | 153.920861 (4) | 2.18 (3) | oxide | 64 - 67+ |
| 155 Gd | 154.922618 (4) | 14.80 (12) | oxide | 90 – 92+ |
| 156 Gd | 155.922118 (4) | 20.47 (9) | oxide | 93 - 95+ |
| 157 Gd | 156.923956 (4) | 15.65 (2) | oxide, chloride | 87 - 99+ |
| 158 Gd | 157.924019 (4) | 24.84 (7) | oxide | 97+ |
| 160 Gd | 159.927049 (4) | 21.86 (19) | oxide | 98+ |
Gadolinium Isotopes have the highest cross section for the capture of thermal neutrons of any element and this is mainly due to the high cross section of Gd-157 (255,000 barn) and Gd-155 (61,000 barn). Natural Gadolinium is currently used as a burnable poison in nuclear fuel, but the use of Gd-155/157 only has been proposed as this would create an even more effective burnable poison. Gd-152 is used for the production of radioactive Gd-153 which is used for osteoporosis research and bone density measurements. Gd-160 is used in double beta decay research.