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Most of the readings from the locations above are usually within normal limits, save the Fukushima stream (bottom center). There are times, however, when i notice massive 50-100% increases in levels within a very short time frame. Just earlier today, i saw the Fukushima GC shoot up from the .30 level all the way above 1.5, bounce around erratically for a time, and then resume it's normal range of .20-.50. A few of the Tokyo locations will occasionally increase or decrease 50% on a dime.
Observations with my unit here in the Philippines are steady rates that change in small increments (.01-.02 at the most). Not much jumpiness at all, though indoors tends to read slightly higher than outdoors. Although readings may be comparable here as with certain areas in Japan, there is definitely a different sort of stasis and dynamic with the air here vs there, and it's obvious. The radioactivity in the air there is causing the volatility in readings.
If you want an appreciable exposure rate in Japan, you're better off obtaining a cumulative over a 24 hour period and dividing it up to get an average hourly rate. The range is pretty nuts.