It’s been a long time since I have gone total science. I will keep it really high level today since I know that most of you first won’t care and second probably don’t have the chemistry background to truly understand. But, I will do the best I can to keep it approachable. I think the Wikipedia article is pretty good if you want to go deeper into this.
You have for surely heard of Helium and Neon they are elements arranged on the farthest right hand column of the periodic table. Because their elemental properties are all similar, they get the nickname ‘noble gases’. A noble gas is an element that is very non-reactive due to its atomic structure. Radon is also a noble gas.
That is not all of the story. Being non-reactive doesn’t mean that elements live in perpetuity. There is something called a half life and it is what it seems. It is the time that it takes for half of the total molecules to degrade into something else. We typically refer to that as radioactivity. The farther down the column you go of noble gases the shorter the half life or the more radioactive they are.
Even though Radon is very stable from a reaction standpoint, the half life is only a couple of days. What that ultimately means is half of Radon becomes another element (radioactive Polonium) in a couple of days. Further to that, the half life of Polonium is only three minutes until it becomes radioactive lead. This continues for twenty some years until that Radon becomes elemental lead and is considered safe.
Where does this Radon come from? Believe it or not, Radon starts off as Uranium in the soil. I think that we are all aware that Uranium is radioactive. That is what the bombs are made of, it is what powers the reactors for energy. Is it any surprise then that it decays into Radon for a short period of time? I will spare all the breakdown beginning at Uranium since I can sense I have pushed things to the edge already.
Don’t be scared, this has been happening since the beginning of time. It’s here and we just don’t know it. Since radioactive elements have a habit of increasing cancer risk, it is definitely something that would be best avoided for prolonged exposure. The worst part about it is that when we build homes, we trap the natural air and put ourselves in the middle of a concentrating environment.
We didn’t choose to have a radon test. It is certainly something I have wondered about throughout the years but you know how things go, out of sight, out of mind. Looking at the projected maps, I was a little uncertain about how we would fair with the testing and ultimately would prefer not to spend money on a mitigation system. But that would not be the case. The main house was fine but the ADU got a result above the action level.


You should know that radon testing is not required and neither is doing something with the readings in Oregon. Strictly speaking, we could have ignored things but my wife wanted to act. Putting in a mitigation system was not terrible. I am pretty sure that there is a lot of margin in the work, four hours, six inch PVC pipe and elbows and an inline fan makes $2500 look like a pretty good living. That cost also included a retest, a $200 value.
The way mitigation works is that it starts with coring a hole in the slab. A pipe is placed in the hole and any gaps are sealed. From there the pipe is directed outside. Add an inline fan and you are done. The principle is that the fan is going to suck on whatever ground is under the slab and the air that comes up is going to be blown into the atmosphere. Testing is done in the living space.
This by the way is the same type of mitigation that is also done with dry cleaner or fuel contaminated soils in a place that cannot be dug out. For several years I did this kind of work on superfund sites. In those cases, the plume can move underground with the winds so to speak. Our job was to map and monitor what that plume looked like via test results.
I could tell that something was happening because there has been a distinctive stale grease and mustiness smell when I walk in the door. We have not cleaned the place up since the tenant moved out other than some really high level sweeping. It really is not required for selling a house, the standard is reasonably clean. I have done it plenty with every tenant turnover so I am taking advantage of not having to do it. After the fan was installed, the place smelled much better.
After running the fan for a week, the retest was started. Since we were just barely above the action level in the first place, I am not surprise in the least the testing showed that we had half of the amount of radon than we did before mitigation. You would call this a success.
End Your Programming Routine: I am not here to say that Radon is not a problem. In our house, we should definitely look at any kind of weird and foreign potential causes of disease. I will say that I am a little bit skeptical that it is something to worry a lot about especially when right at the action level. If the potential buyers were never to wanted the test, we would have never known.


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