Assertion: protactinium's radioisotope | /r/HasProperty | characterized with half-life of 7,917 years
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text: Thirty-one radioisotopes have been characterized, with the most stable being 232Th, 230Th with a half-life of 75,380 years, 229Th with a half-life of 7,917 years, and 228Th with a half-life of 1.92 years.