FIELD: physics.
SUBSTANCE: invention is used for object analysis by radiation methods with assistance of neutron emission. Source of thermal neutrons contains source of fast neutrons and converter. Fast neurons moderating block is made of polyethylene in the form of hollow cube, converter is installed inside the block; between converter end surface and block inner surface there is a layer of polyethylene forming cavity. Reflecting converter, layer of gamma radiation emission, protective layer absorbing thermal and fast neutrons arranged serially are installed at surface of moderating block.
EFFECT: efficiency upgrading of fast neutrons into thermal ones and size reduction of polyethylene component in moderating block.
3 cl, 4 dwg
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