Assertion: plutonium's isotope | /r/HasAspect | shorter half-life
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Source sentences:
text: ; this isotope has a shorter half-life and a much lower energy density, but is cheaper.
text: As the first isotope of neptunium to be discovered has such a short half-life, McMillan and Abelson were unable to prepare a sample that was large enough to perform chemical analysis of the new element using the technology that was then available.