@article{oai:uuair.repo.nii.ac.jp:00013646,
 author = {清水, 奈名子 and SHIMIZU, Nanako and 手塚, 郁夫 and TEZUKA, Ikuo and 飯塚, 和也 and IIZUKA, Kazuya},
 issue = {54},
 journal = {宇都宮大学国際学部研究論集, Journal of the School of International Studies, Utsunomiya University},
 month = {Sep},
 note = {text, 紀要論文 / Departmental Bulletin Paper, Eleven years have passed since the TEPCO’s Fukushima Daiichi Nuclear Power Plant accident occurred in March 2011, and damage from the accident still continues both within and beyond Fukushima Prefecture. Since the half-life of radioactive cesium-137, which was released in large quantities as a result of the accident, is as long as approximately 30 years, many studies have continued on the behavior of diffused radioactive cesium over time.
The authors have already published a paper on the measurement results of soil collected in December 2018 at housing sites in northern Tochigi Prefecture that was contaminated by the TEPCO’s accident. This paper aims to clarify the actual state of radioactive cesium attenuation within the housing site by measuring soil collected at the same sites in September 2020 and November 2021 and comparing the results with those of 2018. The authors collected the surface soil (0-5 cm in depth) and measured air dose rate from 30 points in the five sites of residential areas in Nasushiobara City and Nasu Town. Overall, cesium concentrations tended to decay, but an increase was observed at several observation sites. It was found that the samples with radioactive cesium exceeding 40,000 Bq (40kBq) /㎡ , which is the standard of radiation control area, were found in 3 sites out of 5 in 2021.
As a result, it can be pointed out that that soil contamination by radioactive cesium in the northern part of Tochigi Prefecture is still serious in the residential areas where people spend the most of their time. Moreover, the seriousness of soil pollution cannot always be estimated only by air dose rates. If we consider that the half-life of radioactive cesium 137 is about 30 years, it cannot be expected to reduce the concentration of radioactive cesium in a short period of time. Therefore, it is necessary to conduct the long-term surveys of the soil in the area affected by the nuclear power plant accident.},
 pages = {29--37},
 title = {栃木県北部の宅地敷地内における土壌中の放射性セシウム－2018年、2020年、2021年の調査結果の比較考察－},
 year = {2022},
 yomi = {シミズ, ナナコ and テヅカ, イクオ and イイヅカ, カズヤ}
}