How can energy in Ev of particles e.g. muons be measured in a cloud chamber?

I have a Wilson thermoelectric cloud chamber and would like to obtaine the energy of cosmic particles e.g. muons. I would greatly appreciate your answer.

In a uniform magnetic field of strength $B$, a particle of charge magnitude $q$ and momentum $p$ traveling in the plane perpendicular to the magnetic field travels in a circular path with a radius given by: $$R=\frac{p}{qB}$$
So if you have a uniform field in your cloud chamber charged particles will follow a circular arc. Using simple geometry, you can determine the radius of curvature and thus the momentum. Once you have that, the kinetic energy is simply: $$K=\sqrt{(pc)^2+(mc^2)^2}-mc^2$$