that is clearly the same pattern to me. the times for the peaks vary a little.

i wish i had a clearer understanding of what that represents.

I can not stress enough how helpful my HEPA air purifier with the GMC-200 geiger counter on the intake filter was for detecting this pattern. This would NOT have been visible from inside the house our likely with the geiger counter alone outside.

I understand having the GC outside increases the possibility of measuring any Beta significantly over a similarly acquired indoor measurement, due to the difficulty of Beta traveling through the house structure. But similarly acquired inside or outside Gamma measurements (with air filters on each) (the Washington state graph is of Gamma) should be the same...hmmm, unless the outside filters are trapping Beta that is throwing off Gamma? Do these measurements suggest short-lived radon progeny, since they decay back down to backgrounds levels in relatively short time?

You've probably answered this before, but where is your air purifier/GC located? Indoors or out?

It has been outside since April of 2013, the difference in my detections are like night and day. After all, the EPA uses a filter catch system too for their detections so why shouldn't we Our government gets their best readings using a filter catch system, we should do it too.