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Stable ErbiumIsotopes - Er Isotopes

Nominal
mass

Accurate
mass

% Natural
abundance

Chemical
form

Enrichment
available %


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

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

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

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

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

¹⁷⁰Er	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.