Assertion: thorium's life | /r/HasProperty | 8.0 ×
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Source sentences:
text: Of the four short-lived isotopes, two belong to the uranium-radium series, namely 234Th (half-life, 24.1 days) and 230Th (half-life, 8.0 × 104 years), and two belong to the actinium series, namely 231Th (half-life, 25.6 hours) and 227Th (half-life, 18.17 days).