Fig. 2From: An assessment of radiation doses at an educational institution 57.8 km away from the Fukushima Daiichi nuclear power plant 1 month after the nuclear accidentComparison of mean radiation dose rates and count rates measured at 1 cm and 100 cm above the ground surface, by area. Mean ± standard deviation are indicated; *p < 0.01 compared with mean measurement at 100 cm above the ground by Mann–Whitney U testBack to article page