From the Daily Yomiuri Online:
"The science ministry has announced the results of radiation monitoring in areas between one and 21 kilometers from the Fukushima No. 1 nuclear power plant.
The research was conducted in 128 locations on April 18 and 19 to judge whether it was safe enough for residents to temporarily return home in areas close to power station in Fukushima Prefecture.
The Ottozawa district in Okumamachi, about three kilometers west-southwest of the plant, recorded the highest figure of 110 microsieverts per hour, the Education, Culture, Sports, Science and Technology Ministry said Thursday.
The figure is about one-ninth of the annual legal limit of 1,000 microsieverts for humans, except during medical treatment or other circumstances."(Apr. 23, 2011)
Visitors have 9 hours at this location before they max out their radiation allotment for the year, so it would literally have to be a quick dash in and out.
Update: 1 worker gets 100 mSv in one shot, 30 workers are at 100 milliSieverts or more