A collimator including a housing having disposed therein a shield element surrounding a converter core in which a photon beam is generated from electrons emanating from a linear accelerator. A beam channeler longitudinally adjacent the shield element has a beam aperture therethrough coaxially aligned with, and of the same diameter as, an exit bore of the converter core. A larger entry bore in the converter core is coaxial with, and longitudinally separated from, the exit bore thereof. Systems incorporating the collimator are also disclosed.
CONTRACTUAL ORIGIN OF THE INVENTION
This invention was made with government support under Contract No. DE-AC07-05-1D14517 awarded by the United States Department of Energy. The government has certain rights in the invention.