Device and method for estimating the concentration of gas radon

A device for measuring Radon gas concentration, comprising:

• an electrostatic measuring chamber including a detecting device adapted to detect alpha particles from Radon gas in said electrostatic chamber;
• a collecting electrode mounted externally of said measuring chamber and adapted to electrostatically collect the electrically charged radioactive decay products of Radon gas coming from said electrostatic measuring chamber;
• said detecting device and collecting electrode being configured for operating between:
• a first operating condition for measurement of the gas concentration in which said detecting device is active and said collecting device is inactive;
• a second operating condition for removal of electrically charged residues, in which said collecting electrode is active and said detecting device is inactive;
• a control unit configured for timing said first and second operating conditions as a function of a first timing signal.