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Gadolinium Isotopes

Stable Gadolinium Isotopes - Gd Isotopes
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, chloride 90 - 94+

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, metal 97+

160 Gd 159.927049 (4) 21.86 (19) oxide, metal 97 - 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.