Electronvolt
The electronvolt (or eV) was a unit of energy. The electronvolt was also a factor in determining radiation density in terms of eV per cubic meter.

The hydrogen molecule has a "threshold" of 14.7 electronvolts. () 

Kiloelectronvolt = 1,000 electronvolts
A gamma scan revealed that the Crystalline Entity left behind a trail of antiprotons with a sharp spike at 10 keV. ()

The tertiary subspace manifold, the home of a species of solanogen-based lifeforms, was located at a subspace energy level of 16.2 keV. ()

Megaelectronvolt = 1,000,000 electronvolts
In 2373, The Doctor purged Kes' body of chroniton radiation with antichroniton bursts increasing from a five second pulse at 10 MeVs, to five second pulse at 15 MeVs, before concluding at 20 MeVs. ()

External link 
 

Measurements

nl:Elektronvolt