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A further update: He was doing some work with an Arduino (electronic/computer prototyping board) that was plugged into the same computer as his radiation detector. When his computer rebooted overnight, it started reading data from it instead of the radiation detector, which produced a bogus radiation reading.
Yeah, a glitch while I was trying to check out the high readings from NYC. Operator error. It should be back to normal now.
I'd strongly suggest that you advise people to understand that glitches do happen. If you see a high reading, when other readings, especially those nearby, are normal, that it is far more likely to be a glitch than an actual high radiation reading.
Typical background radiation levels for most of the USA are in the 5 to 28 uR/hr range. Readings can be higher for brief periods of time due to normal variations in radiation levels. They can also be consistently higher for areas at high elevations such as Colorado, or with larger natural deposits of uranium, thorium, radon, etc.