Assertion: gamma ray's source | /r/HasProperty | small relative
Facets:
value: to the required shielding
type: OTHER
value: very
type: DEGREE
Source sentences:
text: Depleted uranium is used for shielding in portable gamma ray sources, but here the savings in weight over lead are larger, as a portable source is very small relative to the required shielding, so the shielding resembles a sphere to some extent.