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Zinc Isotopes

Stable Zinc Isotopes - Zn Isotopes
Nominal
mass
Accurate
mass
% Natural
abundance
Chemical
form
Enrichment
available %

64 Zn 63.9291448 (19) 48.6 (60) metal, oxide 75 - 99+

66 Zn     metal, oxide, carbonate 62 - 99

67 Zn 66.9271291 (17) 4.1 (13) metal, oxide 78 - 97

68 Zn 67.9248459 (18) 18.8 (51) metal, oxide, sulphate 37 - 99+

70 Zn 69.925325 (4) 0.6 (3) metal, oxide 64 - 95+
 

Zinc Isotopes are used extensively in both industrial and medical applications. Depleted Zn-64 is added to the cooling water of nuclear reactors in the form of oxide or acetate to prevent stress corrosion cracking. It also reduces the release of (stable) Co-59 into the cooling water by forming a thin spinel layer on the Co containing steel surfaces. Neutron irradiation of Co-59 will result in the formation of Co-60, a radioisotope which emits high energy gamma radiation and is a major contributor to the dose rate of personnel working in the reactor. Enriched Zn-67 is often used in biological research into the uptake of Zn in the human body. It can also be used for the production of radioactive Ga-67 in smaller cyclotrons. However, by far most Ga-67 is made from Zn-68. Zn-67, Zn-68 and Zn-70 can all be used for the production of the therapeutic isotope Cu-67. Zn-66 has been proposed as an alternative target for the production of Cu-64 and Ga-67. Finally Zn-70 is also used in biological research and in research into super-heavy elements.