| 摘要 |
A system (10) for monitoring or controlling the level of radon in indoor air, based upon measuring alpha particles due to the decay of radon or its daughter atoms. In one embodiment, the alpha particle decay of radon itself is detected and analyzed to control a vent (74) in the heating and air conditioning system (12) to automatically keep the radon level below a preselected level. In another embodiment, the daughter atoms <218>Po and <214>Po are collected from the indoor air and their alpha particle decays are analyzed to provide a sensitive monitor of radon levels or the control vents (74) in the HVAC system (12) to reduce radon concentrations to permissible levels. In addition, the system (10) provides information on the quality of the air filter (16) and indicates when it needs servicing. |
