Assertion: lead pencil's lead | /r/HasProperty | extended
Facets:
value: mechanically
type: MANNER
value: from radiation in nuclear science
type: OTHER
value: by releasing it
type: MANNER
Source sentences:
text: These can be divided into two groups: propelling pencils use an internal mechanism to push the lead out from an internal compartment, while clutch pencils merely hold the lead in place (the lead is extended by releasing it and allowing some external force, usually gravity, to pull it out of the body).
text: Lead is an established shielding material from radiation in nuclear science and in X-ray rooms due to its denseness and high attenuation coefficient.
text: The lead, often made of graphite, is not bonded to the outer casing, and can be mechanically extended as its point is worn away as it is being used.