I am wondering about your high zero count rate. Because the chamber is open at only one end, there is no natural air flow through it and the radon concentration inside shall drop to zero after some time. Did you check a welding rod donated with Thorium-Dioxide as a source?
3rd November 2011 05:13
OE9NRH wrote ...
Hallo Alan
Nice work!
I am wondering about your high zero count rate. Because the chamber is open at only one end, there is no natural air flow through it and the radon concentration inside shall drop to zero after some time. Did you check a welding rod donated with Thorium-Dioxide as a source?
73 from the other side of the planet
Norbert