There are two rain filter designs shown here to filter roof down pipe water.
At the location here, rain water is collected off a ~69 square meter roof area. It is a relatively new roof. In this design two types of filter material are be used for filtering, polyester wool and activated charcoal. Sometimes they are used together, and at other times they are use separately.
When charcoal is used, approximately 880 grams of activated charcoal is placed the gray pipe section. If a combination polyester wool and activated charcoal filter are used, the polyester wool is put in last. This traps any large organic material before it reaches the charcoal. When a collection test is finished the filter is removed, and warmed in the sun to dry it out. The filter can be left for a few days to let any Radon decay daughter isotopes decay away before testing. If activated charcoal is used, at the end of processing it is placed in a large marinelli beaker. Filters are placed in a lead and copper lined test chamber, for scintillator testing.
If you have better equipment to test with than a Geiger counter, I think this method is a much better detection system for detecting trace amounts of fallout. The paper swab system is a quick, and effective collection system, for a Geiger counter test.
The side pipe is to release pressure if the flow rate gets to much, or the particulate filter starts to get blocked.
Making particulate filter
Inserting particulate filter
The pipe assembly is left unglued so it can all be pulled apart easily. The side pipe is at a steeper angle than is shown in this picture, so as to improve the flow rate through the charcoal filter. During a rain event it maybe necessary to remove the filter, and replace it with a new one. It can get blocked from the first down flows off the roof, if it hasn't rained in a while. You can do this easily and quickly by putting your hand in through the side pipe and removing the old filter, and replacing it with a new one.
Always use disposable surgical gloves when handling a rain swab, charcoal or filter, when using either testing system. Also keep your hands away from your face, and wash your hands well afterwards. You have no idea what you may have captured!
Design Two: (Since August 2015, this new down pipe paper towel rain filter design was used.)
1. In this second rain water filter design, the end of a paper towel is cut off and shortened to fit into a marinelli beaker.
2. It is then placed into a stiff plastic gauze framework, so it can maintain it shape when the down pipe rain water flows over it. This framework also helps to keep the marinelli filter shape when it is sun dried. After sun drying the filter is placed back in the marinelli beaker for scintillator testing.
3. The marinelli beaker with the filter inside it, is placed in a lead and copper lined test chamber for scintillator testing, to see if any radioactive isotopes can be detected.
|Local Background Radiation Monitoring Site||“The Food Lab”, International reports of radioactive food contamination.||Free Personal Development Books||Radio
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