Niobium-81 es un isotopo de niobium.

Niobium-81
isotope of niobium[*]
subclasse de niobium
numero atomic: 41
numero de neutrones: 40
decade a: Yttrium-80, Zirconium-80, Zirconium-81, Zirconium-81
semivita: 200±200 nanosecond