Ionizing radiation, emitted in the form of electromagnetic waves or particles, carries enough energy to remove electrons from atoms. This property of ionizing radiation makes it useful in research, development, and for medical treatments but also makes it hazardous to human. The potential for acute and chronic biological damage warrants health concerns when working with materials that emit ionizing radiation. When proper control and training are used the hazards to one’s health can be minimized and not hinder the potential of advancement through use of ionizing radiation. The RPP program provides training and support to make this possible at MIT.