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[–] 7 points 5 months ago (1 child)

The beta emission of ⁶⁰Co can probably get through over 6mm of glass. This should be plenty for phones.

But also

⁶⁰Co undergoes beta decay to an excited state of the stable isotope nickel-60 (⁶⁰Ni), which then emits two gamma rays [...]

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