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Here's some actual news about searching for people who have been overexposed to radiation. It's an article about how municipalities in Fukushima as well as the prefectural government have on their own initiative gone out and bought portable whole body scanners (at $625,000 a pop) to drive into neighborhoods to check people's actual exposure levels:

Fukushima municipalities forced to go it alone on radiation testing

Courtesy of Asahi.com

Here's a relevant quote from the article about radiation levels found in people in the hardest hit areas of Fukushima, and not distant Tokyo:

It released encouraging results on May 15 based on tests conducted on 9,502 people. While radioactive cesium was detected in 68.9 percent of adults (senior high school students or older) in October 2011, that figure had dropped to 9.9 percent in March this year.
The corresponding figures for children (junior high school students or younger) also fell from 32.3 percent to 0.8 percent.
Radiation levels dropped in all 67 children who showed high radiation levels in their first checkups and received follow-up tests. Levels also fell for 112 of 114 adults who showed high radiation levels in their first checkups. Two men, both aged 60 or older, showed a slight increase in their levels.
“Cesium has decreased for most of the people because it has passed out of the body in the form of urine or other substances. As for those whose radiation levels rose, there could be influences from food taken by them. It is necessary to continue to have checkups, including tests on food,” said Masaharu Tsubokura, a doctor at Minami-Soma City General Hospital, who was in charge of the WBC checkups for Minami-Soma residents.