Reader comment: There may be radioactive neptunium in your house! Neptunium accumulates in a common household item: ionizing smoke detectors. To detect smoke, another actinide element, americium-241, emits radiation and turns into neptunium-237. But no need to worry: the amount of radioactive material in smoke detectors is negligible and causes no harm to human health, according to Emsley. Smoke detectors contain less than 0.00000001 ounces (0.0000003 grams) of americium, which decays so slowly that only about 0.2 percent of this already small amount converts to neptunium each year............P
If you wish, you can begin watching the video below at the 3:30 mark on the video
https://www.youtube.com/watch?v=1PCyvKYdRL8&t=375s
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