Lansce fail-safe radiation shutter design for isotope production facility

Abstract

Dose rate modeling and post irradiation measurements of the Isotope Production Facility (IPF) beamline, at the Los Alamos Neutron Science Center (LANSCE) accelerator have determined that a radiation shielding shutter is required to protect personnel from shine from irradiated targets for routine beam tunnel entries. This paper will describe radiation dose modeling, shielding calculations, and the fail-safe mechanical shutter design.

Mechanical design of the gamma blockers for the high-energy beam transport region of the European Spallation Source

“…Many of them have already introduced dedicated devices to minimize the radiation level during the machine hands-on maintenance. The following can be mentioned as examples: -GB of the Spallation Neutron Source (SNS) [4,5]: backstream gamma radiation shielding by a horizontally actuated absorbing block, enclosed in a vacuum chamber, driven with a pneumatic cylinder; -Fail-safe radiation shutter in Los Alamos Neutron Science Center (LANSCE) [6]: backstream gamma ray protection for the isotope production facility, consisting of a tungsten block vertically actuated with a pneumatic cylinder; -Lead shutter for the Linear IFMIF (International Fusion Material Irradiation Facility) Prototype Accelerator (LIPAc) [7]: a truncated conical block of lead with a pneumatic actuator, separating the accelerator area from the activated beam dump target.…”