Assertion: cesium's isotope | /r/CapableOf | play vital role
Facets:
value: in global positioning satellites
type: LOCATION
value: in aircraft guidance systems
type: LOCATION
value: in internet and cellular telephone transmissions
type: LOCATION
Source sentences:
text: With cesium isotopes used as an atomic resonance frequency standard in atomic clocks, and playing a vital role in aircraft guidance systems, global positioning satellites, and internet and cellular telephone transmissions, a cesium supply crunch cannot be allowed and resources must be monitored closely.