| 摘要 |
FIELD: measuring intensity of alpha-rays, for instance that of material specimens. ^ SUBSTANCE: alpha-ray detector has hermetically sealed case filled with working gas and provided with sealing window for charging specimen being analyzed; radiation sensor disposed within case and made in the form of proportional counter; movable specimen holder; power supply and signal conversion unit; novelty is that inner surfaces of case are spaced through distance l apart from active surface of radiation sensor, this distance being chosen from condition l >= lambdatr, where lambdatr is alpha-particle track length at maximal energy. Specimen holder is installed between inner surface of case and radiation sensor; it is movable in direction of radiation sensor for recording at desired distance from its active surface, maximal distance of specimen holder from active surface of radiation sensor being chosen to equal s >= l + t, where t is size of specimen being analyzed in direction of displacement. In addition, specimen holder can be made so that its dimensions in direction perpendicular to that of displacement are smaller than respective ones of specimen being analyzed. ^ EFFECT: enhanced sensitivity of equipment and its efficiency due to eliminating impact of alpha-ray activity of detector case and specimen holder walls, as well as uncontrolled internal impurities on device readings. ^ 1 cl, 2 dwg |
