Assertion: actinium | /r/HasAspect | half life of 21.773 years
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Source sentences:
text: It has a half life of 21.773 years and emits approximatly 56 J/s per gram of actinium 227 (this calculated energy release takes into account decay produts at equlibrum, assumes no gamma rays, assumes all alpha rays emmited have the same energy, and that all beta rays emitted have the same energy).