which of the following types of radiation has the greatest penetrating ability
Highest penetration: Gamma (y) Second highest: Beta (B) Weakest penetration: Alpha (a) Explanation: The relative penetrating abilities of alpha, beta, and gamma radiation. The heavy, highly charged alpha particles are stopped by a piece of paper (or the skin). The lighter, less highly charged beta particles penetrate paper, but are stopped by a 0.5-cm sheet of lead.