To improve airtightness of a dust collection part to enable more correct measurement of activity concentration by correcting a distortion of a fixed dust collection part and a movable dust collection part when fitted by a correction mechanism.
When radioactive dust contained in air to be measured is captured, a drive mechanism 10 is driven to lower a drive shaft 11. Force applied to a drive shaft coupling metal fitting 12 coupled to the drive shaft 11 is transmitted via a correction mechanism coupling metal fitting 14 and a fulcrum 15 to a correction mechanism holding point 17, thereby moving a correction mechanism 16 fixed to a movable dust collection part 3 toward a fixed dust collection part 1. Since the correction mechanism 16 can move in a direction of A-B with the correction mechanism holding point 17 as the center, force applied to the drive mechanism uniformly presses the movable dust collection part 3 against the fixed dust collection part 1. At this time, elasticity of the metal fitting 14 coupled to the correction mechanism 16 effectively works in a direction of an A-B orthogonal axis which is to be corrected, and a distortion when both dust collection parts are fitted can be corrected, thereby improving airtightness in the direction of A-B. The correction mechanism 16 is equipped with a window 34 to reserve a passage of a filter paper 2.
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KAIHARA AKIHISA
KUWABARA HITOSHI
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