Estimated association between dwelling soil contamination and internal radiation contamination levels after the 2011 Fukushima Daiichi nuclear accident in Japan
Open Access
- 29 June 2016
- Vol. 6 (6), e010970
- https://doi.org/10.1136/bmjopen-2015-010970
Abstract
Objectives Measurement of soil contamination levels has been considered a feasible method for dose estimation of internal radiation exposure following the Chernobyl disaster by means of aggregate transfer factors; however, it is still unclear whether the estimation of internal contamination based on soil contamination levels is universally valid or incident specific. Methods To address this issue, we evaluated relationships between in vivo and soil cesium-137 (Cs-137) contamination using data on internal contamination levels among Minamisoma (10–40 km north from the Fukushima Daiichi nuclear power plant), Fukushima residents 2–3 years following the disaster, and constructed three models for statistical analysis based on continuous and categorical (equal intervals and quantiles) soil contamination levels. Results A total of 7987 people with a mean age of 55.4 years underwent screening of in vivo Cs-137 whole-body counting. A statistically significant association was noted between internal and continuous Cs-137 soil contamination levels (model 1, p value 2 increase in soil contamination). Analysis of categorical soil contamination levels showed statistical (but not clinical) significance only in relatively higher soil contamination levels (model 2: Cs-137 levels above 100 kBq/m2 compared to those 2, RR=1.75, p value 2 compared to those 2, RR=1.45, p value Conclusions Low levels of internal and soil contamination were not associated, and only loose/small associations were observed in areas with slightly higher levels of soil contamination in Fukushima, representing a clear difference from the strong associations found in post-disaster Chernobyl. These results indicate that soil contamination levels generally do not contribute to the internal contamination of residents in Fukushima; thus, individual measurements are essential for the precise evaluation of chronic internal radiation contamination.This publication has 26 references indexed in Scilit:
- Reduction of High Levels of Internal Radio-Contamination by Dietary Intervention in Residents of Areas Affected by the Fukushima Daiichi Nuclear Plant Disaster: A Case SeriesPLOS ONE, 2014
- Assessment of the Risk of Medium-Term Internal Contamination in Minamisoma City, Fukushima, Japan, after the Fukushima Dai-ichi Nuclear AccidentEnvironmental Health Perspectives, 2014
- Comparison of the Chernobyl and Fukushima nuclear accidents: A review of the environmental impactsScience of The Total Environment, 2014
- Estimation of soil-to-plant transfer factors of radiocesium in 99 wild plant species grown in arable lands 1 year after the Fukushima 1 Nuclear Power Plant accidentJournal of Plant Research, 2013
- Limited Internal Radiation Exposure Associated with Resettlements to a Radiation-Contaminated Homeland after the Fukushima Daiichi Nuclear DisasterPLOS ONE, 2013
- The Relationship between Media Consumption and Health-Related Anxieties after the Fukushima Daiichi Nuclear DisasterPLOS ONE, 2013
- SCIENTIFIC ISSUES IN RADIATION DOSE RECONSTRUCTIONHealth Physics, 2008
- Transfer of 137Cs from Chernobyl debris and nuclear weapons fallout to different Swedish population groupsScience of The Total Environment, 2006
- ECOLOGICAL HALF-TIME AND EFFECTIVE DOSE FROM CHERNOBYL DEBRIS AND FROM NUCLEAR WEAPONS FALLOUT OF 137Cs AS MEASURED IN DIFFERENT SWEDISH POPULATIONSHealth Physics, 2006
- Concept of seasonality in the light of the Chernobyl accidentThe Analyst, 1992