Measuring the velocity of particles crossing a boundary

Is it possible to find the velocity of a particle such as electon or proton, when it crosses a boundary? which card can help me to do so?

USRBDX and USRYIELD give you the kinetic energy spectrum of a particle type, which you can re-express as a function of particle velocity.

Dear @KD_22,

You can use a USRBDX card to score the energy of the particle. Then you can convert this in velocity with some postprocessing.