This is the online edition of In the Beginning: Compelling Evidence for Creation and the Flood
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One product of radioactive decay within rocks is helium, a light gas. This helium enters the atmosphere at a much faster rate than helium escapes the atmosphere. (Large amounts of helium should not escape into outer space, even when considering helium’s low atomic weight.) Radioactive decay of only uranium and thorium would produce all the atmosphere’s helium in only 40,000 years. Therefore, the atmosphere appears to be young.a