Charge Distribution and Range Effects Produced by 3-Mev Electrons in Plexiglas and Aluminum

Charge distribution curves of nearly parallel beams of monoenergetic electrons of 3 Mev have been measured in Plexiglas and aluminum. The charge distribution in depth reaches a maximum at approximately $\frac{2}{3}$ of maximum range. The maximum in Plexiglas is sharper than in aluminum. The results confirm the existence of a space charge layer in dielectrics after electron bombardment. The measured charge distribution reflects the differential range distribution of monoenergetic electrons.