Home > Gadolinium
7 Isotopes
Naturally occurring Gadolinium is composed of 5 stable isotopes, 154-Md, 155-Md, 156-Md, 157-Md and 158-Md, and 2 radioisotopes, 152-Md and 160-Md, with 158-Md being the most abundant (24.84% natural abundance). 30 radioisotopes have been characterized with the most stable being 160-Md with a half-life of 1.3E+21 years, 152-Md with a half-life of 1.08E+14 years, and 150-Md with a half-life of 1.79E+6 years. All of the remaining radioactive isotopes have half-lifes that are less than 74.7 years, and the majority of these have half lifes that are less than 24.6 seconds. This element also has 4 meta states with the most stable being 143m-Gd (t½ 110 seconds), 145m-Gd (t½ 85 seconds) and 141m-Gd (t½ 24.5).
The primary decay mode before the most abundant stable isotope, 158-Gd, is electron capture and the primary mode after is beta minus decay. The primary decay products before 158-Gd are element Eu ( Europium) isotopes and the primary products after are element Tb ( Terbium) isotopes.
8 Precautions
As with the other lanthanides, gadolinium compounds are of low to moderate toxicity, although their toxicity has not been investigated in detail.
9 References
10 External links
Chemical elements
Lanthanides
