Internal exposure doses from ¹³⁴Cs and ¹³⁷Cs by domestic consumption of edible wild plants in the former evacuation zone in 2022 and 2045 were estimated based on deposition data from airborne survey and aggregated transfer factors for 11 species. On the assumption that annual consumption of edible wild plants is about 6 kg, the internal exposure doses in 2022 and 2045 are 0.3–139.0 μSv/y and 0.1–78.7 μSv/y, respectively, which are less than 53 μSv/y in more than 90% of the areas in 2022 and less than 30 μSv/y in 2045. Even considering the different scenarios for the intake of Koshiabura (Chengiopanax sciadophylloides), which has a high radioactivity level, the exposure dose did not change significantly and was only a few percent of the upper limit of 1 mSv/y for the additional exposure dose from foods.

More than 11 years have passed since the Great East Japan Earthquake that caused extensive damage mainly in the Tohoku region. While reconstruction is progressing in many areas, issues remain concerning the final disposal of more than 13 million m³ of removed soil and decontaminated waste currently stored in interim storage facilities. This session focused on the social acceptability and multidimensional fairness of out-of-prefecture final disposal of removed soil generated by decontamination in Fukushima Prefecture. Although technical studies on the final disposal, such as volume reduction and storage, have made progress, discussions on the social acceptability of various options in the site selection process and the consensus building process have not progressed much. In this session, based on the latest research results on the consensus, we discussed selection process and social acceptability assessment for out-of-prefecture final disposal of removed soil, and future directions.

Many epidemiological studies have shown that noise exposure is a risk factor causing adverse health effects, for example cardiovascular diseases, coronary heart diseases. WHO/EU assessed levels of evidence for associations between noise exposure and health effects and confirmed a causal link between road traffic noise and ischemic heart disease (IHD). In Japan, however, there are few studies investigating the health effects due to traffic noise, although some studies conducted around a military airport exist. We carried out a questionnaire survey of 6,000 older residents at Katsushika Japan and verified whether road traffic noise induced IHD at Japanese dwelling environment. Data of 2,736 respondents were taken into multiple logistic regression analysis and following results were obtained. Road traffic noise level (measured by L_den) was correlated with prevalence rate of IHD (65–70 dB: OR=1.76 (0.92–3.34), 70 dB–: OR=1.95 (1.01–3.75)) and sleep disturbance had a relationship with IHD (OR=1.76 (1.17–2.63)). The relationship between noise exposure and health effects may arise since noise exposure causes a sleep disturbance and sleep disturbance leads adverse health effects.

The aim of this study is to analyze how accidents occur during recess under school management quantitatively with accidents data recorded by Japan Sports Council. In total, 823 accidents data in elementary school from 2005 to 2019 were analyzed by principal component analysis, which extracted five components for interpretation (destruction of glass, eye injury in ball game, being off balance, fall from a bar, and game of tag). Multiple regression analysis revealed the factors (age, sex, type of recess, and place of occurrence) that can affect the component scores on each dimension. Specifically, school grade affected scores of 1st and 2nd component score. Sex affected 2nd and 4th component score. Type of recess affected 1st and 5th component score. The place of occurrence affected each component score by some places. It is considered that this result represents how often each summarized situation occurs proportionately in each category with controlling confounders. From these analyses, some trends about how accidents under school management were indicated. It can be considered that quantitative analysis is one profitable method to analyze data of occurrence status and to understand the current situation about accidents under school management.

The environment surrounding surveys requiring the cooperation of participants has been changing, with increasing awareness of the need to protect personal information and the use of online surveys. Issues such as how to respond to inquiries from participants, what should be communicated to relevant bodies in advance about the survey, and how to provide incentives and feedback to participants are important to ease tension and prevent conflicts between participants and researchers, or between researchers and relevant bodies, and to increase the public trust in researchers and the science. Based on the authors’ experiences, this letter summarizes notes for conducting surveys that require participants’ cooperation. As the social impact of research has been gaining increasing attention, it is expected that practical tips and views on conducting field surveys are widely shared.