Patent ID: 8074487
Filing Date: 2011-12-13
Classification: G01D

Abstract:
1. A method of setting a lower threshold reading value in an apparatus for measuring Radon and/or its progeny in an air sample, comprising the steps of: a) providing an apparatus for measuring Radon in an air sample, the apparatus including a preset offset voltage corresponding to a threshold conductivity value and a preselected reading value for indicating a concentration of Radon and/or its progeny; b) exposing the apparatus to a calibration area for measuring conductivity of the air therein; c) comparing the measured conductivity value obtained in step b) with the preset offset value for conductivity; and d) setting a lower threshold conductivity value and corresponding threshold reading value same as the preselected reading value if the measured conductivity value in step c) is lower than the preset offset value for conductivity.