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1. Radioactive dating works by measuring the ratio of isotopes *** amount of radioactivity absorbed radioactivity left time it takes for the radioactivity to disappear 2. Larger atoms get broken into smaller atoms in nuclear reactors*** the Sun X-ray mach...

An isotope used in nuclear reactors is U-238. The energy comes from high-energy neutrons the loss of mass during nuclear reactions*** carefully controlled chemical reactions tiny nuclear explosions encased in huge domes The way radioisotopes are useful in...