Measured

energy

$E_m\mathrm{,}\text{MeV}$

Electron

velocity

$u,\times {10}^{8}m/\sec$

Relativistic

kin. energy

$E_k\mathrm{,}\text{MeV}$

Detectable

kin. energy

$E_{det}\mathrm{,}\text{MeV}$

1.6

2.88

1.3

1.5

4.8

2.96

2.7

4.8