Isotopes of lutetium

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What Wikipedia says

Naturally occurring lutetium (71Lu) is composed of one stable isotope 175Lu (97.40% natural abundance) and one long-lived radioisotope, 176Lu with a half-life of 37 billion years (2.60% natural abundance).

Excerpt from the Wikipedia article “Isotopes of lutetium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: M.S. Litz and G. Merkel Army Research Laboratory, SEDD, DEPG Adelphi, MD 20783, Public domain, via Wikimedia Commons.