Assertion: gamma ray's source | /r/HasProperty | weak
Facets:
value: extremely
type: DEGREE
Source sentences:
text: Sources of cosmic gamma-rays are extremely weak (that is, they produce relatively few gamma-ray photons for us to detect in the vicinity of Earth) and require long observations, sometimes several weeks, to get a significant detection or accurate measurement of a source.
text: The major disadvantage of the panoramic is that it may be impractical to reach the center of the item (enclosed pipe) or the source may be too weak to perform in this arrangement (large vessels or tanks).