This occupation maps radioactive drugs in the body, and monitor the characteristics and functions of tissues or organs in which they localize

The answer is nuclear medicine technologists, they use diagnostic imaging techniques to detect map radioactive drugs in the human body, they administer radioactive pharmaceuticals to patient and them monitor the characteristics and functions of tissues or organs in which they localize. Abnormal areas show higher or lower concentrations of radioactivity than normal ones do. Nuclear medicine technologists are equipped in 1-year certificate programs accessible by hospitals to those who are already radiologic technologists, medical technologists or registered nurse or who are in 2 to 4 year programs accessible in university schools of allied health and oblige to come across the least federal principles on the management of radioactive drugs and the operation of radiation recognition apparatus. 

Idk little ngr try paying attention in school and you would know ngr