Assertion: plutonium's life | /r/HasProperty | determined
Facets:
value: at 17 hours
type: TEMPORAL
value: as 510±20 years
type: TEMPORAL
Source sentences:
text: It decays by emission of a α-particle to 237Np; the half-life of this decay was first determined as 510±20 years but then corrected to 432.2 years.
text: The half-life of this decay was initially determined at 17 hours, which was close to the presently accepted value of 16.02 h.