In nuclear medicine we use a small injection of radioactivity to show how particular organs or tissues are working. This injection gives off radiation which enables pictures to be taken using a gamma camera. These pictures will give your doctor more information about your condition. Depending on the type of scan, you may need to wait up to a few hours for the injection to be absorbed before the images are taken. About the injection; when you arrive for your appointment, an injection will be given – usually through a vein in your arm. This is similar to having a blood test and will only take a few minutes. You will not feel any different after the injection; it will not make you sleepy or affect your driving. Nuclear medicine procedures are time consuming and the radioactive material used has to be pre-ordered specifically for you from a radio-pharmacy outside of Medya Diagnostic Center. The order is made the day before your appointment.