The primary decay mode at atomic weights lower than the most abundant stable isotope, 158 Gd, is electron capture, and the primary mode at higher atomic weights is beta decay. The primary decay products for isotopes lighter than 158 Gd are isotopes of europium and the primary products of heavier isotopes are isotopes of terbium .

The isotopes with atomic masses lower than the most abundant stable isotope, 158 Gd, primarily decay by electron capture to isotopes of europium. At higher atomic masses, the primary decay mode is beta decay, and the primary products are isotopes of terbium.

Mar 26, 2025 · Gd-158 is the most abundant isotope and accounts for 248% of the element’s natural abundance. Thirty-three radioisotopes are known. Isotopes with atomic masses lower than Gd-158 mainly decay via electron capture. Isotopes with higher atomic masses primarily decay via beta decay. Gd-155 and Gd-157 are used in nuclear reactors and medical imaging.

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Gadolinium has 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 ...

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Decay chain image generated by Mathematica 's GraphPlot and IsotopeData functions from Wolfram Research, Inc.. Detailed decay information for the isotope gadolinium-148 including decay chains and daughter products.

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Normally there are energies listed with an intensity ≥ 1 %. Intensity Values are given in percent. The format used for the uncertainties in the listed values can be illustrated by the following examples: [1] PTB-6.11-97-1, Braunschweig, Oktober …