Fast Neutron Generators: Radiation Levels and Shielding Requirements.

@ Neutron and gamma radiation levels around a Cockcroft-Walton neutron generator producing 14-Mev neutrons at an approximate rate of 1010 neutrons per second were measured under conditions typical of those required for activation analysis. Neutron flux reduction to acceptable levels for limited operation was accomplished by 12 feet of distance that included shielding consisting of 27 inches of water and 16 inches of solid concrete block. Other radiation hazards encountered were the production of x-rays and the release of tritium from the target.