FIELD: radiometry, radiation activity measuring technology. SUBSTANCE: chamber for radon activity determining has alpha-particle detector for radon daughter nuclear decay fragments, aerosol strainer and air-valve. Chamber body is made like telescopic ring members with air proof dynamic connection sealing and lock units. Chamber height is equal to 0,8-1 with respect to bigger ring diameter. EFFECT: more convenient construction for air quick-analyzer. 3 dwg
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