Radiologic technologists also operate diagnostic imaging equipment, but their equipment creates an image by projecting an x-ray through the patient. Nuclear medicine technologists explain test procedures to patients. They prepare a dosage of the radiopharmaceutical and administer it by mouth, injection, or other means. When preparing radiopharmaceuticals, technologists adhere to safety standards that keep the radiation dose to workers and patients as low as possible. Technologists position patients and start a gamma scintillation camera, or scanner, which creates images of the distribution of a radiopharmaceutical as it localizes in and emits signals from the patient's body.
Technologists produce the images on a computer screen or on film for a physician to interpret.
Some nuclear medicine studies, such as cardiac function studies, are processed with the aid of a computer. Nuclear medicine technologists also perform radioimmunoassay studies which assess the behavior of a radioactive substance inside the body. For example, technologists may add radioactive substances to blood or serum to determine levels of hormones or therapeutic drug content. Technologists keep patient records and record the amount and type of radionuclides received, used, and disposed of. This may include evening or weekend hours in departments which operate on an extended schedule.