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Zirconium Isotopes

Stable Zirconium Isotopes - Zr Isotopes
Nominal
mass
Accurate
mass
% Natural
abundance
Chemical
form
Enrichment
available %

90 Zr 89.9047026 (26) 51.45 (2) oxide 84 - 99+

91 Zr 90.9056439 (26) 11.22 (2) oxide 44 - 96+

92 Zr 91.9050386 (26) 17.15 (1) oxide, metal 72 - 97+

94 Zr 93.9063148 (28) 17.38 (2) oxide 80 - 98+

96 Zr 95.908275 (4) 2.80 (1) oxide 53 - 89+
 
Zirconium has five stable isotopes, of which a few are used for the production of radioisotopes. Although radioactive Zr-95 is a fission product, it can also produced by neutron irradiation of Zr-94. Zr-96 has been used for the production of the radioisotope Zr-97. Zr-90 can be used for the production of the PET isotope Nb-90. Finally, Zr-90 has been proposed for cladding in nuclear fuel. The use of Zr-90 would lower even further the already low neutron absorption cross section of natural Zr that is currently used as fuel cladding.