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Erbium Isotopes

Stable ErbiumIsotopes - Er Isotopes
Nominal
mass
Accurate
mass
% Natural
abundance
Chemical
form
Enrichment
available %

162 Er 161.928775 (4) 0.14 (1) oxide 22 - 39+

164 Er 163.929198 (4) 1.61 (3) oxide 62 - 82+

166 Er 165.930290 (4) 33.6 (35) oxide 96 - 98+

167 Er 166.932046 (4) 22.95 (17) oxide 94 - 96+

168 Er 167.932368 (4) 26.8 (26) oxide 98+

170 Er 169.935461(4) 14.9 (27) oxide 97 - 98+
 
Erbium has six stable isotopes but only Er-168 appears to have a well established application. Er-168 is used for the production of Er-169 which is used in form of citrate for the treatment of rheumatoid arthritis.
 
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