| Gold foil and Bonner sphere measurements were taken in the TREAT high bay to determine the neutron energy spectrum and flux at various locations. The Bonner spheres are used to estimate the free air neutron flux and spectra. Gold foils provide thermal flux information in more locations in the TREAT high bay then were able to be measured with Bonner spheres. The generated neutron flux and spectrum can be used as process knowledge for radiological Tier 1 and Tier 2 release per DOE-STD-6004-2016, “Clearance and Release of Personal Property from Accelerator Facilities”. Spectrum data was used with ORIGEN to conservatively calculate activation and decay of all naturally occurring elements (z=1-83). Activation data was used with a wide variety of materials to determine which elements and materials are a concern for activation. This release methodology is preliminary and is currently only applicable for items greater than 10 ft from the bio-shield on the first floor. Further work needs to be done to apply this methodology to the 2ndfloor, 3rdfloor, and basement of TREAT or items closer than 10 ft from the bio-shield. Key Words: neutron spectrum, TREAT, Bonner Sphere, gold foil |