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The calibration process includes three steps: (1) A stable radon concentration will be produced in the SRC; (2) The benchmark instrument (Alpha-GUARD PQ2000 emanometer, Genitron Company, Germany) will be used; (3) A comparative measurement will be conducted, and the scale factor of the device will be calibrated.
3]) in soil air with a Markus-10 emanometer (RnM) (Petersell et al.
The active carbon detector, a track detector, and the high sensitivity emanometer and so on are used to monitor the radon of the human living space and the water resource.