Patients are injected with a radioisotope which then travels around the body & organs. The camera detects the gamma rays given off by the isotope and converts the data into a digital image of the area concerned.
Shielding for Gamma camera’s can vary depending on the isotopes used etc. but is generally between 2.5 & 3.5mm. The Radiation Protection Advisor for the hospital is responsible for advising the actual shielding required and this will depend on a multitude of factors.