Actinium used in a sentence

Actinium in a sentence as a noun

That's one example, and there's also lead 212 and actinium 228, which also peaks in the 100s of keVs.

[1] Sidestepping the entire debate here about whether lanthanum and actinium are d-block elements, or lutetium and lawrencium are.

An old TRS-80 assembly programming book I had suggested that an early conference of computer experts suggested that the last six digits be named actinium, barium, curium, dysprosium, erbium, and fermium until "cooler heads prevailed".