Becquerel

Rarity: Rare

A topic known well beyond its field, found in many languages.

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What Wikipedia says

The becquerel ( ; symbol: Bq) is the unit of radioactivity in the International System of Units (SI). One becquerel is defined as an activity of one per second, on average, for aperiodic activity events referred to a radionuclide.

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

Image: Doug Sim, CC BY-SA 3.0, via Wikimedia Commons.