If absorbed internally, alpha particle emitters are the most damaging because alpha particles if absorbed internally, alpha particle emitters are the most damaging because alpha particles have the largest charge. have the greatest mass. have the greatest energy. consist of pure energy. consist of high energy electrons.

have the greatest mass

Explanation:

The health consequences of alpha particles are highly dependent on how exposure occurs. External exposure is of less importance than internal exposure, as alpha particles lack the energy to penetrate the dead skin outer layer. But if alpha particles are inhaled or somehow enters into the stream of blood this can damage the living tissues and increases the chance of cancer, especially lung cancer.