What is "gammator"

ӀA Gammator was a gamma irradiator made by the Radiation Machinery Corporation during the U.S. Atoms for Peace project of the 1950s and 1960s. The gammator was distributed by the " Atomic Energy Commission to schools, hospitals, and private firms to promote nuclear understanding." Around 120-140 Gammators were distributed throughout the U.S. and the whereabouts of several of them are unknown, although the Department of Energy has removed and destroyed many of the units.