Assertion: erbium's isotope | /r/HasProperty | required as the decay product of 255es
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Source sentences:
text: Although the most stable isotope of fermium is 257Fm, with a half-life of 100.5 days, most studies are conducted on 255Fm (t 1/2 = 20.07(7) hours), since this isotope can be easily isolated as required as the decay product of 255Es (t 1/2 = 39.8(12) days).