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  • 1 Slovak Technical University Faculty of Chemical Technology Bratislava Czechoslovakia
  • 2 Facultés Universitaires N.D. de la Paix Namur Belgium
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A composite scintillation detector consisting of two scintillators with different scintillation decay times, exhibiting a very low sensitivity to isotropic -radiation is presented in the paper. Detection characteristics of several such detectors have been experimentally verified and the rules for their design are given.