Old-fashioned cathode-ray tube monitors used to be a low-level source of ionising X-rays, but these have virtually all been replaced with flat-screen monitors, which don't emit X-rays. So the remaining domestic sources of radiation are mostly things that contain small amounts of radioactive elements. Bananas, for example, contain enough of the isotope potassium-40 that eating one gives you 0.0001 millisieverts (mSv) - roughly the same radiation dose as living within 80km (50 miles) of a nuclear power plant (in other words, virtually none).
This story is from the August 2023 edition of BBC Science Focus.
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This story is from the August 2023 edition of BBC Science Focus.
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