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While Fukushima is not over yet and still struggling to this day. I would just carry a basic geiger counter. Its good to be vigilant especially to something you cant see. Just don't get caught up in a mass hysteria. Id be more worried about earthquakes, tsunamis and gojira.
That said, you need a very sensitive geiger counter to pick up trace amounts found on food and water. Most on the market wont even pick up the radioactive K in bananas. Also the japanese radiation standards for food is much stricter now.
If your interested in a basic and compact geiger count, have a look at the MightyOhm geiger counter. I built one for fun to test lenses and old crap in the garage.
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