Assertion: californium's structure | /r/HasProperty | probed by x-ray diffraction
Facets:
value: over a period
type: TEMPORAL
Source sentences:
text: An important phenomenon for radioactive solids has been studied on these two crystal forms: the structure of fresh and aged 249BkBr 3 samples was probed by X-ray diffraction over a period longer than 3 years, so that various fractions of berkelium-249 had beta decayed to californium-249.