We have small diffusion chambers from aluminum, inside this chamber a Ra-226 source is installed with a normal emanation coefficient. Do we need to isolate this box with a roof using a good isolation glue?
We try black silicon with good results although it dosn't work always
thanks Kostas C. Stamoulis for answer can u send me this work papers ?
Epoxy works well. Polyurethane based caulks or glues work well. Epoxy paint over a porous seal works well. Butyl rubber pressure seals work well. For all of these radon loss is essentially zero.
Silicone does not seal radon unless it has a co-polymer. Silicone is used as a water vapor barrier in some radon collection devices. Silicone passes radon, but not water.
Do an internet search for radon glues and caulks. There are several products listed with data.
You may try an O-ring made of rubber, covered by silicon greaze inside a metal nest and tighten by screws.
To seal my samples, I use high density polyethylene (HDPE) bottles with screw cap of the same material. You can see this in the attached presentation (page 6) to work: "NATURAL OCCURRING RADIONUCLIDES IN NOVEL SAND BEACHES FROM ESPÍRITO SANTO, STATE, BRAZIL" on my profile. In a similar to your experiment, I used a PVC tape on the threads and, after threaded, sealed with silicone. For more information, contact me at [email protected]
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