I’ve been searching for air sampling filters for alpha spec, radon grab sampling and CAM use. It seems the most popular and cheapest is the glass fiber type as opposed to the PTFE which is very expensive.

Attached is Hi-Q fact sheet on GF filters. I did find a cheap set of PTFE type from china that I ordered and will test out to see how good or bad the tails are compared to the GF ones.

https://www.ebay.com/itm/265557143381?hash=item3dd4706f55:g:9uEAAOSwNiZiEOWR

I also have some Hi-Q Environmental RVPH-25 47mm air sample filter holders if anyone needs one for radon grab sampling.

Dud

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