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論文

Antimony from brake dust to the combined sewer collection system via road effluent under rainy conditions

尾崎 宏和*; 吉村 和也; 朝岡 良浩*; 林 誠二*

Environmental Monitoring and Assessment, 193(6), p.369_1 - 369_9, 2021/06

We investigated influence of road effluent on Antimony (Sb) in combined sewer water under rainy and dry weather conditions. Sb in road effluent showed significantly higher concentration than sewer, and Sb concentration in sewer during the wet weather was also significantly higher than that during the dry weather. Furthermore, Sb concentration in the sewer water decreased with time during a wash-off event. Clear positive relationships between Sb and Cu, and Sb and Ba in both in road effluent and road dust extract indicated an impact from brake abrasion because brake lining contains Cu, Sb and Ba in high concentration. Approximately 42% of Sb load occurred during the wash-off event while those of Cu and Ba were much less. Unlike Cu and Ba, we conclude that Sb in combined sewer water is largely dependent on road effluent during wet weather, resulted by wash-off of road dust probably associating with brake lining abrasion.

論文

Applicability of autonomous unmanned helicopter survey of air dose rate in suburban area

吉村 和也; 藤原 健壮; 中間 茂雄

Radiation Protection Dosimetry, 184(3-4), p.315 - 318, 2019/10

 被引用回数:1 パーセンタイル:23.13(Environmental Sciences)

To investigate the applicability of autonomous unmanned helicopter (AUH) survey, the result of AUH survey in sub-urban area was compared with air dose rate measured on the ground. The AUH survey showed similar measurement error with the errors reported for plane permeable fields (within uncertainty factor of 2), suggesting that the AUH survey is effective tool to clarify the air dose rate distribution in urban area. The other survey tools on the ground, however, is necessary to clarify the distribution in detail. The measurement error of the AUH survey was suggested to be attributed to the spatial heterogeneity of coefficient to convert the $$gamma$$ ray count rate detected by AUH to the air dose rate.

口頭

Rapid removal of cesium-137 from urban area after the Fukushima Dai-ichi Nuclear Power Plant Accident

吉村 和也

no journal, , 

This study evaluated Cs-137 inventories for 11 buildings in the evacuation zone in 2015 and 2016. Additionally, the results were analyzed with the data obtained in the model decontamination project to evaluate temporal trend in the distribution during the initial five years after the accident. The inventory on paved ground accounted for 20% of that on permeable field, and other building components such as roof, wall and window showed low inventory (less than 4%). These values indicate the limited contamination of urban area. The inventories of paved ground, roof and wall in 2011 and 2012 showed similar values with those obtained in this study, suggesting that initial run-off and the following wash-off effects during the first year after the accident largely defined the distribution of Cs-137 in urban area.

口頭

Environmental radiation monitoring in Fukushima, 2; Urban environment

吉村 和也

no journal, , 

Current situation and prediction of the radiocesium contamination and air dose rate in the residential areas are a large concern for public and government. Residential area is a multimedia-environment composed of diverse surfaces such as pavements and buildings in addition to permeable fields like agricultural lands. Since radiocesium behavior depends on the surfaces1, their distribution and time dependency differ greatly from those in other land uses. Therefore, detailed monitoring of radiocesium and air dose rate focusing on the residential areas is necessary to obtain effective and practical information for radiation protection. This presentation shows monitoring tools we employed to residential areas after the FDNPP accident and some findings obtained by the monitoring.

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