Project GABRIEL refers to an investigation by the United States Atomic Energy Commission

United States Atomic Energy Commission

The United States Atomic Energy Commission was an agency of the United States government established after World War II by Congress to foster and control the peace time development of atomic science and technology. President Harry S...

 to gauge the impact of radioactive fallout resulting from nuclear warfare. GABRIEL surmised that radioactive isotope Strontium-90

Strontium-90

Strontium-90 is a radioactive isotope of strontium, with a half-life of 28.8 years.-Radioactivity:Natural strontium is nonradioactive and nontoxic, but 90Sr is a radioactivity hazard...

 presented the greatest hazard to life globally. This resulted in the commissioning of Project SUNSHINE

Project SUNSHINE

Project SUNSHINE was a series of research studies to ascertain the impact of radioactive fallout on the world's population. Commissioned jointly by the United States Atomic Energy Commission and USAF Project Rand, SUNSHINE sought to examine the long-term effects of nuclear radiation on the...

, which sought to examine the levels of Sr-90 in human tissues and bones (with a special interest in infants) gathered from around the world.