Strontium-90

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What Wikipedia says

Strontium-90 (90Sr) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 28.91 years. It undergoes β− decay into 90Y (yttrium-90) with a decay energy of 546 keV.

Excerpt from the Wikipedia article “Strontium-90”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Chuck Davey, CC BY-SA 4.0, via Wikimedia Commons.