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Home arrow Environment arrow Radiation Monitoring and Dose Estimation of the Fukushima Nuclear Accident

Conclusion

A GM-tube detector was calibrated with a standard cesium-137 (137Cs) source and used for measuring radioactive contamination from the Fukushima Daiichi Nuclear Power Plant. The GM-tube detector used in this study was calibrated up to 4 μSv/h based on a quadratic equation. This GM-tube detector yielded the same result as a NaI scintillation counter, and its practical use was validated under calibration.

Air dose rates were measured in Fukushima City, Iwaki City, Shirakawa City, and Samegawa Village and along the Tohoku and Banetsu Expressways during our screening activity in Fukushima Prefecture from March 19 to 22, 2011. Those rates in Fukushima City were highest, followed by those along Tohoku Expressway, whereas those in Samegawa Village and along Banetsu Expressway (both located in the Abukuma highlands) were relatively low. This radioactive distribution agreed with the MEXT reports consisted of airborne monitoring in April 2011. The radioactivity on masks used and the external and internal exposure was substantially low.

Acknowledgement We thank the Matsushimaya Ryokan staff for their support despite difficulties following the Great East Japan Earthquake and the subsequent nuclear accident. We thank Mr. Yukihiro Mizuochi for measuring the dose rates. This work was supported by KUR Research Program for Scientific Basis of Nuclear Safety.

Open Access This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

References

1. Hirose K (2012) 2011 Fukushima Dai-ichi nuclear power plant accident: summary of regional radioactive deposition monitoring results. J Environ Radioact 111:13–17

2. Ohta T et al (2012) Prediction of groundwater contamination with 137Cs and 131I from the Fukushima nuclear accident in the Kanto district. J Environ Radioact 111:38–41

3. Tagami K et al (2011) Specific activity and activity ratios of radionuclides in soil collected about 20 km from the Fukushima Daiichi Nuclear Power Plant: radionuclide release to the south and southwest. Sci Total Environ 409:4885–4888

4. Fukushima prefecture government. pref.fukushima.jp/nuclear/info/pdf_files/ H230615.pdf (in Japanese)

5. Japan Atomic Energy Agency, Distribution Map for Radiation Dose. ramap.jaea.go.jp/ map/

6. MEXT. mext.go.jp/component/english/ icsFiles/afieldfile/2011/05/10/1304797_ 0506.pdf

7. Katata G et al (2012) Numerical reconstruction of high dose rate zones due to the Fukushima Dai-ichi Nuclear Power Plant accident. J Environ Radioact 111:2–12

 
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