FIELD: physics of reactor radiation in various materials.
SUBSTANCE: proposed device is made in the form of truncated cone whose smaller base is oriented to object and has set of water-containing neutron moderator plates alternating with converter plates made of material absorbing thermal neutrons in radiation capture reaction. Diameters of cone larger and smaller bases are chosen so as to ensure shading of entire object under test and its middle part from direct rays of reactor, respectively. Cone height is chosen so as to ensure desired ratio of neutron attenuation in middle part of object.
EFFECT: reduced nonuniformity of neutron distribution lengthwise of object under test, enhanced gamma-ray dose contribution in object radiation loading field.
1 cl, 4 dwg
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