著者

Tsutomu Shimura Ichiro Yamaguchi Hiroshi Terada Toshihiko Yunokawa Erik Robert Svendsen Naoki Kunugita

出版者

内閣府食品安全委員会

雑誌

Food Safety (ISSN:21878404)

巻号頁・発行日

vol.3, no.3, pp.84-91, 2015 (Released:2015-09-29)

参考文献数

21

被引用文献数

2

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Herein we analyzed food monitoring data regarding the Fukushima accident. The Japanese government ordered local governments to implement food monitoring after the Fukushima nuclear accident. This protective action for food safety contributed to the reduction of internal radiation exposure derived from the Fukushima accident. According to the food monitoring data collected from March 2011 to March 2015, more than 70% of the samples were beef. One hundred fifty four samples from a total of 776,310 beef samples that were above provisional regulation values or new standard limits were restricted from market distribution. Most of the beef samples were below the detection limits by regulation of consumption of contaminated rice straw. Two hundred forty one from a total of 251,510 beef samples were above the detection limit during fiscal year 2014. The mean committed effective dose due to annual beef consumption was estimated to be 1 µSv. The 99.9 percentile committed effective dose was 20 µSv. Thus, internal exposure due to beef consumption is limited. However, local governments continue regular monitoring for beef in response to social concerns. It should be noted that continuous staff effort and high costs are required to maintain this food surveillance program. A formal evaluation may help to assist in the development of a more effective and efficient food monitoring system.

著者

Tadashi Kawasaki Shojiro Kotegawa Yasuo Ito Masato Goda Ichiro Yamaguchi

出版者

The Merleau-Ponty Circle of Japan

雑誌

メルロ=ポンティ研究 (ISSN:18845479)

巻号頁・発行日

vol.20, pp.74-77, 2016-09-10 (Released:2017-01-23)

著者

Gen SUZUKI Ichiro YAMAGUCHI Hiromitsu OGATA Hideo SUGIYAMA Hidenori YONEHARA Fumiyoshi KASAGI Saeko FUJIWARA Yoshimi TATSUKAWA Ippei MORI Shinzo KIMURA

出版者

Journal of Radiation Research Editorial Committee

雑誌

Journal of Radiation Research (ISSN:04493060)

巻号頁・発行日

vol.51, no.6, pp.683-689, 2010 (Released:2010-11-23)

参考文献数

23

被引用文献数

28

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In two previous nation-wide surveys in the late 1980s and early 1990s, Japanese indoor radon concentrations increased in homes built after the mid 1970s. In order to ascertain whether this trend continued, a nation-wide survey was conducted from 2007 to 2010. In total 3,900 houses were allocated to 47 prefectures by the Neyman allocation method and 3,461 radon measurements were performed (88.7% success). The fraction of reinforced concrete / concrete block buildings was 32.4%, similar to the value from national statistics. Arithmetic mean (standard deviation, SD) and geometric mean (geometric SD) of radon concentration after adjusting for seasonal fluctuation were 14.3 (14.7) and 10.8 (2.1) Bq/m3. The corresponding population-weighted values were 13.7 (12.3) and 10.4 (2.0) Bq/m3, respectively. It was estimated that only 0.1% of dwellings exceed 100 Bq/m3, a new WHO reference level for indoor radon. Radon concentrations were highest in houses constructed in the mid 1980s and decreased thereafter. In conclusion, arithmetic mean indoor radon in the present survey was slightly lower than in previous surveys and significant reductions in indoor radon concentrations in both wooden and concrete houses can be attributed to alterations in Japanese housing styles in recent decades.