Radon is generated by the decay of radium nature only a colorless,tasteless, odourless, natural inert gas.Radon is a radioactive gas thatare prevalent in our living environment, for the first time since the1960 s found that the harm of indoor radon, scientific studies havefound that radon radiation to human body harm of human body by more than55% of all environmental radiation, a great threat to human health, itsonset latency period mostly in more than 15 years.Radon has been theinternational agency for research on cancer (IARC) in indoor importantcarcinogens, the epa will radon is listed as one of the most dangerouscarcinogenic factor, so we must attach importance to the harm of indoorradon.The source of radon, derived from the structure of the foundationand the surrounding soil accounts for about 60.4% of the indoor radon,from building materials and outdoor air accounted for 19.5% and 19.5%respectively.(1) the foundation soil radon exhalation.Deep in theformation of uranium, radium, thorium in soil and rock, one can findhigh levels of radon.The radon can pass fault, into the soil and theatmosphere, and along the crack spread to the interior.In general, thelower housing indoor radon content is higher.(2) building materials(including interior decoration materials) in precipitation of radon isthe main source of indoor radon.Building materials contain a differentdegree of radium, especially using industrial waste residue containingradium more or building materials made of by-products, produced by thedecay of radium, radon some through diffusion into the interior.Buildingmaterials of the radon exhalation ability in addition to the related toits radium content, and building materials of porosity, particle size,pore geometry, and the change of water content and pressure.(3) theoutdoor air into the indoor radon.In the outdoor air radon radiationdose is very low, but once in the interior, will be to the accumulationof indoors.Indoor radon also has obvious seasonal change, availablethrough the experiment, the highest in winter, the lowest insummer.Visible, indoor and ventilated condition directly determines thesize of the indoor radon harmfulness to human body.(4) water and releasein the combustion of natural gas, radon.Only water and gas radoncontent is higher when there will be a hazard.The harm of radon and itsdaughter: the harm of radon to human, as was discovered in 100 years agoin Germany.At that time, Germany nyberg mine miner lung cancerincidence of a disease is extremely high, is called "nyberg disease".45years found that it may be because the mine is caused by high radonconcentration in the air.It was not until the 50 s of this century,finally determine the radon is one of the important cause of lungcancer.In this way, people from long-term exposure to high levels ofradon and its daughter of miner lung cancer incidence experience,gradually know the unequilibrium radon and its short life harm tohealth.
More information at amxfan.com/Indoor-Air-Pollution.html