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Simple homemade filter for radioactivity

 
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I read online somewhere how to use a 5 gallon bucket to filter water in case of nuclear event to filter out radioactivity.  Poke a bunch of small holes in bottom of 5 gallon bucket.  Put 2 inches of gravel or small pebbles in bottom.  Put down a handtowel and then add 6” of clay dirt.  Towel is to stop gravel and dirt from mixing.  Pack it down really good on top.  Then add another towel.  Put inch of rocks on top of this second towel to hold towel down.  Pour water over top to filter fallout.  Still need to boil water or use Berkey to filter before drinking.

We do not have clay soil in our area.  Can I purchase fire clay from Pottery Supply instead??
 
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I would not rely on a homemade filter for radioactivity.

That filter would work for filtering rainwater or well water under normal circumstances.

May be this article will help explain:

Reverse osmosis (RO) is supported by the EPA as a “best available technology” for various radioactive elements, including alpha and beta particles, uranium, radium and photon emitters. According to the EPA, it can remove up to 99% of these contaminants, while RO units can be automated and compact.



https://www.water-technology.net/features/feature121661/
 
Beth Mouse
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Thank you for the input.  I have RO installed in my kitchen but this is more for a grid down situation after a nuclear event and I would not have running water.  I would use my RO water first that I have stored but would run out probaby after a week or so...
 
Beth Mouse
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The article you kindly attached says:  
"Iodine-131, however, is usually found in water as a dissolved gas, rendering reverse osmosis (which cannot capture gases) an ineffective treatment mode. It can be removed using a combination of relatively simple technologies, though, and personal radiation water filters are available, utilising filtration methods and medias frequently used in the nuclear power industry. The EPA recommends the general public adopt a process combining activated carbon, reverse osmosis and ion exchange – effectively covering all bases."

Not sure if there is a gizmo that utilizes all three processes it mentioned...
 
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Beth Mouse wrote: ".......The EPA recommends the general public adopt a process combining activated carbon, reverse osmosis and ion exchange – effectively covering all bases."

Not sure if there is a gizmo that utilizes all three processes it mentioned...



Although designed (and typically priced!) for laboratory settings, if you want to get pretty pure with your water, you may want to search out the water purification systems at https://www.emdmillipore.com/ . These likely would have the goods for removing to acceptable levels whatever you wish from your water.  One example from one system shown below.  Most home under-the-sink reverse osmosis filters would provide the 'input water feed' for a Millipore water purifier and the whole system typically mounts on a wall (3 X 3 ft square space) but could be mounted under a roomy sink.  Good luck!....
MilliQ.JPG
[Thumbnail for MilliQ.JPG]
 
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