Detecting residual fluorine 18 from a medical PET-CT procedure during population whole body counter screening in Fukushima.

After the Fukushima Daiichi nuclear incident in 2011, radiation contamination of the affected area raised public health concerns about internal radiation exposure. Internal radiation exposure screening using a whole body counter (WBC) (Fastscan Model 2251, Canberra Inc, Meriden, CT) has been performed for the affected residents in Soma City, 40 km north of the Fukushima Daiichi nuclear power plant (Figure 1). Analysis was performed by use of the Apex-InVivo and Genie software (Canberra Inc). Detection limits were 220 Bq for cesium 134 and 250 Bq for cesium 137 with a 2-minute scan.