Each October, the Nobel Prizes celebrate a handful of groundbreaking scientific achievements. For George de Hevesy, the 1943 Nobel Laureate in chemistry who discovered radioactive tracers, that place ...

That substance, known as a tracer, has been tagged with a tiny amount of short-lived radioactive material that emits positrons. It takes about an hour for the tracer to circulate throughout the body, ...

For the first time, researchers have succeeded in passing an antibody through the blood-brain barrier to act as a tracer for PET imaging of the brain. This resulted in more precise information being ...