Continued Monitoring?

Good luck with attempting to do your own testing.

As BRAWM member Mark has explained, testing for Fukushima fallout with a Geiger counter is actually pretty useless. A Geiger counter can't do spectroscopy which is what is needed to dig the Fukushima fallout signal out of a sea of natural radioactivity. Mark states this in the following post:

http://www.nuc.berkeley.edu/forum/218/brawm-question-testing-food-geiger...

Geiger counters are rather blunt instruments; they can detect radioactivity but they cannot tell you which isotope is responsible for it. One might detect radioactivity using one of these instruments, but there is plenty of benign natural radiation out there (e.g., where does the 38 CPM of the background test come from?). A Geiger counter would really only be useful for finding contamination in northeast Japan and nowhere else in the world. To find any isotopes released by the Fukushima reactors one needs to use spectroscopic detectors, such as our germanium detectors. But what we have seen in our own measurements is that the amount of radioactivity from the Fukushima accident was very small here on the West Coast, and most traces have long since disappeared from our environment.

Unless you can afford the tens of thousands of dollars needed to purchase a Germanium-based detector that can do spectroscopy, and have the technical acumen in radiation detection; then you are pretty much kidding yourself if you think you can buy a Geiger counter and do your own testing. You're SOL.