Floor monitor - background increasing

[Cehn@AOL.COM]

I have a Ludlum 43-37 floor monitor surveying a large concrete pad - 

outdoors.  On very hot days (>105), the instrument background goes up.  We 

take it into a cool trailer, cool it down, and background stays up.  Any 

ideas?


My favorite theory so far is radon coming off the concrete in the heat, and 

the daughters sticking to the detector.  That would also account for the 

backgrounds returning to normal the next morning.


Joel I. Cehn, CHP

cehn@aol.com

Oakland, CA