The Asahi Shimbun has reported that 4 mysterious, small-sized objects, each emitting high radiation doses, have been discovered some 15 kilometers (9.3 miles) south of the blasted Fukushima Daiichi nuclear power plant. The objects include what appear to be: 1) possibly rubber, with a radiation dose of 1 milliSievert per hour (100 millirem/hour); 2) possibly bark, with a dose of 2.4 mSv/hr (240 mR/hr); 3) possibly plastic sheet, with a dose of 36 mSv/hr (3.6 Rem/hr); and 4) possibly wood chips, with dose of 0.78 mSv/hr (78 mR/hr). The small objects have been taken back to Fukushima Daiichi for further study, although Tepco itself is seeking outside support, as independent critics are also calling for.
A 3.6 R dose is very high to be found on (possibly) a shred of plastic, randomly laying on the ground.
Given that, as reported by MIT, "studies made after the atomic bomb explosions in 1945 at Hiroshima and Nagasaki, half of the people died whose entire bodies were exposed to 450,000 millirems [450 R] of radiation from the atomic bomb. All persons died whose bodies were exposed to 600,000 millirems [600 R] of radiation," 125 hours of exposure to the debris would kill half the people who came in close contact with it; 166 hours of exposure would kill all persons coming into close contact.