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In page Niobium:
"Almost all of the niobium in Earth's crust is 93Nb with half-life 16.12 years. The most stable radioisotope is 92Nb, which decays into 92Zr with half-life 34.7 million years. 92Nb, along with the next most stable one, 94Nb (20,400 years), has been detected in refined samples of terrestrial niobium and may originate from bombardment by cosmic ray muons in Earth's crust.[1] Isotopes lighter than the stable 93Nb tend to β+ decay, and those that are heavier tend to β− decay, with β+-delayed proton emission observed for isotopes as heavy as 84Nb.[citation needed]
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