Abstract
A prototype perimeter security system using a beam of gamma rays from 137Cs is extremely sensitive to interruptions of the beam. Monte Carlo calculations indicate that a 1-Ci source is adequate to protect an interval of 93 m. A gamma-ray source can easily be made bidirectional, which would allow ∼200 m of perimeter to be guarded. A system using a gamma ray having an energy in the range of 500 to 1000 keV would result in a minimum number of false alarms per year.
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