Assertion: sight | /r/CapableOf | use radioactive decay of tritium
Facets:
value: for illumination
type: PURPOSE
Source sentences:
text: Some sights also use the radioactive decay of tritium for illumination that can work for 11 years without using a battery, used in the British SUSAT sight for the SA80 (L85) assault rifle and in the American ACOG (Advanced Combat Optical Gunsight).