SHIP-BOTTOM-SHAPED MODERATOR CONTAINER FOR COLD NEUTRON SOURCE DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a moderator container for a cold neutron source device located in a heavy water tank surrounding a core of a nuclear reactor and generate large quantities of cold neutrons used for the studies on physical properties of substances in life science, polymer science and environmental science especially by locating the moderator container in a position where thermal neutrons flowing in are strong, setting the thickness of liquid hydrogen in the moderator container at about 2 cm, preventing the generated cold neutrons from being absorbed as well as allowing the liquid hydrogen to sufficiently convert the thermal neutrons flowing in to cold neutrons and forming the wall of the moderator container of a thin material such as aluminum alloy that absorbs less neutrons. SOLUTION: This moderator container for a cold neutron source device has an upper part shaped like a hemispherical cap, a body shaped like a halved cylinder and a lower part shaped like a hemispherical cap. Each shaped part has a double-wall structure. The moderator container is composed of the parts mentioned above and a ship-bottom-shaped container where the interstice between the double walls is filled with liquid hydrogen.