AUTOMATIC SYSTEM FOR MONITORING AND CONTROL OF RESIDENTIAL RADON CONCENTRATIONS

摘要

The invention relates to an automatic system for monitoring and control of residential radon concentrations. According to the invention, the system comprises three main parts: an electric energy supply unit, a radon detection unit and a control and data processing unit, where the supply unit comprises a solar panel (1), a voltage regulator (2) and a solar system accumulator (4); the detection unit is made by means of a PIN diode (15) mounted on a glass fiber support (13) on the surface of which a thin copper layer (14) is deposited and connected to ground, the support (13) being placed inside a plastic enclosure (12) provided on its interior walls with a graphite conducting layer (16) which is connected to a positive voltage of 250 V, and with a filter (17) placed at the bottom, so that, between the copper layer (14) and the conducting layer (16) there is an electric field which allows radon disintegration products to be gathered and deposited on the diode surface, generating a low-intensity electric signal which is taken over from the control and data processing unit consisting of two operational amplifiers (19 and 20) which process the electric signal until signals of desired amplitude are obtained, which are further counted by a microcontroller (21) which, depending on the number of impulses in a given interval, computes the radon concentration value, at the same time the microcontroller (21) detecting parasitic impulses and separating them from the useful ones, and, in case the radon concentration exceeds a threshold value, actuating a ventilation system.