The Assistant Radiologist Passbook® prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: preparation of chemical mixtures such as barium salts used in x-rays; use of safety equipment to protect from radiation; determine correct voltage, current and desired exposure time; radiation therapy; knowledge of radioactive isotopes and there use to diagnose and treat diseases; and other related areas.