понеделник, 4 май 2015 г.

Waterborne Radon: Underrated Household Danger

By Herald Camping


Ever since 1983, radon has been a very public, very dangerous problem. Radon leaches out of the earths crust and seeps into the basements and cellars of households and buildings all over the world, and can cause serious health problems if not kept in check.

For all the attention that the entire Radon scare received, it was entirely concerned with airborne Radon. Now, don't get me wrong, airborne radon can cause serious problems for all sorts of people, but it's only part of the problem. The overwhelmingly ignored problem of waterborne radon has finally caught some of the attention of the public, and now that households are testing their water and realizing they are still at risk, substantial action is being taken to protect against this danger. The question remains: how can households protect themselves from waterborne radon?

Waterborne radon generally comes from water sources that originate deep in the ground. This includes wells, ground water streams, aquifers, and underground springs. All these sources spend substantial time near and around the relative geological regions where radon is prevalent, and once radon takes up residence in these water sources, it is unlikely to fall out of solution by any natural process.

Radon in the water can find its way out and into the air at any moment, so having built up radon coming in through the tap can be harmful in all sorts of ways. During showering, dish washing, and laundry washing radon can sneak out of the water used in these activities. The EPA has suggested in studies that anywhere from 2% to 5% of household airborne radon came in through the water supply. Although waterborne radon has seen little press, the EPA has published that anywhere past 4 pCi/L of radon in water is considered dangerous, and should be addressed within the soonest possible convenience.

Several elements such as radon are radioactive, and this means that at any moment (once in a half life, actually) the particle will bust open, spewing radioactive particles into their surroundings. The two main kinds of radiation that radon gives off are alpha and beta particles, and they can move very fast when uninhibited by water, but because waterborne radon is actually surrounded by water, testing for radioactivity can be difficult. The best way to test for radon is to get a sample of the water in question and rush it to a lab. This lab can run several kinds of probing tests on the sample, and in order to get good readings, they need to do this before the radon decays any further.

If radon is found to be present, the best way to get rid of it is aeration.

Home aeration units simply expose the water coming into the house to enough air to sufficiently vet out all the radon particles before they enter the house. Using current water softener technology these units are inexpensive and can remove up to 99.9% of radon from a source.

Spray aeration systems do a similar thing, but use a nozzle to mist incoming water into a huge tank. Once the water is misted, it gets a much greater surface area, and is much more prone to letting go of its radon particles. These particles, once in the air, can be blown away into a vent to carry it off.

Packed column aeration units use the geometry of a pillar to increase surface area of the water flowing through it. A blower then blows air across the water and leaches out any radon. This radon-air water softener is then carried by the pressure gradient, away from the water.

All methods of radon filtration work, and they can all decrease the likelihood of radon related health problems. If you know you have high radon levels in you home, act before you put your loved ones at risk.




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