Neutron and Gamma Ray Attenuation in Sodium Shields.

Final report on a benchmark experiment for neutron transport in thick sodium

“…E . , ,(Z') is the ' og ' g total' total macroscopic cross section at a point within the sodium tank in cm"1 and T is the average thickness of the sodium tank, including the aluminum walls, in cm.The source was mocked up as a point anisotropic source located 59.5 in.along the axis inside the collimator from the exit plane emitting neutrons isotropically over the polar angle range zero to tan" 1 (15.25/2x59.5) -7.30 measured from the centerline, of total intensity kit(59. c >x2.5ko) 2 x 2.J02 x 10 5 = 7.76 x 10 10 neutrons/min/watt, and of zero intensity for polar angles greater than 7.30 . The group source intensities were _aken from the entries in Table III multiplied by the factor kit(59.5x2.5^) 2 -2.87 x 10 5 .…”