Abstract
Abstract The fast neutron therapy facility at the University of Washington has been in routine clinical use for 25 years. 50.5 MeV protons produce neutrons in a beryllium target mounted on an isocentric gantry. Beam shaping is accomplished with a 40-leaf collimator. Dosimetry measurements for treatment planning and calibration are performed with tissue equivalent ion chambers. A layered phantom of alternating Solid Water ® and Plastic Water ® slabs has been developed for rapid dose verification measurements. The neutron field in the room has been used for radiation testing of electronic components.
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