DETECTOR OF NEUTRONS OF DIRECT CHARGE Russian patent published in 1999 - IPC

FIELD: measurement of ionizing radiations. SUBSTANCE: for provision of high identity of characteristics and improved tightness detector has extended metal sleeve 1 housing extended current conductive cylinder 4 manufactured from material having high degree of interaction with neutrons and releasing electrons because of this. It is preferable to manufacture cylinder 4 in the form of length of wire 0.3-1.5 mm in diameter from rhodium, vanadium or silver. Deviation of area of side surface of cylinder 4 from rated value should not exceed 0.5%. Electric insulation tube 6 fabricated preferably from radiation-resistant quartz with wall thickness of 0.15-0.4 mm or from compacted powders of magnesium oxide or aluminum dioxide with wall thickness of 0.2-0.6 mm and having plugged butt is positioned between cylinder and sleeve 1. Deviation of mass of wall of tube 6 falling at 1.0 sq.cm of its surface should not exceed 5% of rated values of specified mass which amounts to 0.03-0.16 g. Sheath 13 of cable 8 is connected leak-tight to sleeve 1, current carrying cable conductor 9 is connected to cylinder 4. Pressure-seal feed-through made in the form of block 15 is connected leak- tight to finish of cable 8 and its electric lead-out is fabricated in the form of metal tube 20 through which current carrying conductor 9 with sealed connection 21 of conductor to finish of tube is let pass. Internal space of detector is desiccated and filled with inert gas, for instance, helium. EFFECT: provision for high identity of characteristics and improved tightness of detector. 12 cl, 3 dwg