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Skyshine Considerations for Accelerator Shielding Design

Carl H. Distenfeld and Robert D. Colvett

Nuclear Science and Engineering

Volume 26 / Number 1 / September 1966 / Pages 117-121


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The Special Measurements Group at the Brookhaven Alternating Gradient Synchrotron has conducted detailed experiments to evaluate and understand radiations emanating from the accelerator. As a part of this group study, skyshine and attenuation through Long Island sand was measured. Attenuation 90° from the apparent line source followed a half thickness of about one foot of sand through at least four decades. This corresponds to an attenuation length in sand of 80 g/cm2., Skyshine was measured out to 1000 m from the target. The empirical results fit the following expression for 4.2 × 1011 protons/sec on target: I = (3000/r2) exp(-r/600) [1 - exp(r/47)] where I is the dose rate in mrem/h and r is the source detector distance in meters. The source luminosity was determined, and a skyshine function was derived, based on the luminosity and the expected attenuation in air based on sand results. The empirical function was found to be within 25% of the derived expression.

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