Assertion: plutonium's concentration | /r/CapableOf | become high
Facets:
value: quite
type: DEGREE
value: in a thermal neutron spectrum
type: OTHER
Source sentences:
text: In a thermal neutron spectrum, the concentrations of several heavy actinides (curium-242 and plutonium-240) can become quite high, creating fuel that is substantially different from the usual uranium or mixed uranium-plutonium oxides (MOX) that most current reactors were designed to use.