- 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
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
- Hideo Sugiyama Hiroshi Terada Kimio Isomura Ikuyo Iijima Jun Kobayashi Kiyoshi Kitamura
- 出版者
- 日本毒性学会
- 雑誌
- The Journal of Toxicological Sciences (ISSN:03881350)
- 巻号頁・発行日
- vol.34, no.4, pp.417-425, 2009-08-01 (Released:2009-08-01)
- 参考文献数
- 24
- 被引用文献数
- 9 15
The isotope 210Po was suspected of being involved in the death of a former Russian intelligence agent in 2006 in the UK. Although human exposure to this natural radionuclide in foods is estimated to be high, few studies are available. UNSCEAR Report 2000 does not contain data on 210Po concentrations of foodstuffs in Japan. We analyzed samples of the everyday Japanese diet cooked with foodstuffs purchased at supermarkets in 7 major domestic cities in 2007-2008. 210Po was quantified by alpha spectrometry and natural radionuclides such as 40K by gamma spectrometry. The daily intake and committed effective dose of 210Po, 40K, and other natural radionuclides for Japanese adults were calculated. Daily intake was 0.34-1.84 (mean ± σ : 0.66 ± 0.53) and 68.5-94.2 (81.5 ± 8.5) Bq/d and the committed effective dose was 0.15-0.81 (0.29 ± 0.24) and 0.16-0.21 (0.18 ± 0.02) mSv for 210Po and 40K, respectively, comprising a high percentage of the total exposure. The total of the mean committed effective dose for the two nuclides (0.47 mSv) was higher than the annual effective dose from ingestion of foods reported by UNSCEAR 2000 (0.29 mSv). The mean committed effective dose of 40K in the 7 major Japanese cities was comparable to the global average (0.17 mSv). The dietary exposure of Japanese adults can be characterized by a higher 210Po contribution than in other countries. Of the total daily dietary 210Po exposure (13 food categories excluding water) for adults in Yokohama, about 70% was from fish/shellfish and 20% from vegetables/mushrooms/seaweeds, reflecting preferences of Japanese to eat a considerable amount of fish/shellfish containing high 210Po concentrations.