Evaluation of Committed effective dose for children due to ingestion of school lunch

• Project/Area Number: 24561052
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Japan Chemical Analysis Center
• Principal Investigator: Ohta Tomoko 公益財団法人日本分析センター, その他部局等, 研究員 (60601797)
• Co-Investigator(Kenkyū-buntansha): Watanabe Yushu 公益財団法人日本分析センター, その他部局等, 研究員 (10544372) ; Ohta Yuji 公益財団法人日本分析センター, その他部局等, 研究員 (00544371) ; Koshikawa Masayoshi 公益財団法人日本分析センター, その他部局等, 研究員 (10627037) ; Kishimoto Takeshi 公益財団法人日本分析センター, その他部局等, 研究員 (20544430) ; Kojima Kenji 公益財団法人日本分析センター, その他部局等, 研究員 (20627038) ; Matsuda Hideo 公益財団法人日本分析センター, その他部局等, 研究員 (60627040) ; Ohta Hiroshi 公益財団法人日本分析センター, その他部局等, 研究員 (10742041) ; Kashiwara Yoko 公益財団法人日本分析センター, その他部局等, 研究員 (80627042) ; 大平 智章 公益財団法人日本分析センター, その他部局等, 研究員 (70627041)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2014: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 子供 / 給食 / 内部被ばく線量 / 内部被ばく / 自然放射性核種 / 人工放射性核種

Outline of Final Research Achievements

In 2009, we evaluated the committed effective dose for Japanese adults due to food ingestion was 0.80mSv. This result was based on the radioactivity concentrations of 238U, 232Th, 226Ra, 210Pb, 210Po, 90Sr, 137Cs and 239+240Pu in foodstuffs.
After the Fukushima Nuclear accident , there has been an urgent need to evaluate the committed effective dose for children.We focused on schoollunch. Samples were collected quarterly at 11 nursely schools and 2 elementary schools from 11 local regions.We collected prepared lunch samples, not foodstuffs.The committed effective dose was evaluated by using the radioactivity concentrations in samples. The evaluated radionuclides were 90Sr, 137Cs, 134Cs, 232Th, 238U, 226Ra, 210Pb, 210Po, and 239+240Pu. 134Cs originated from Fukushima power plant was detected in the samples, however, no significant increase of dose due to Fukushima accident was found. The committed effective due to food intake was dominated by natural nuclides mainly consist of 210Po.

Research Products

• [Journal Article] 食品摂取による内部被ばく線量評価について (2014)
  • Author(s): 太田智子
  • Journal Title: 産業と環境 Volume: 5月号 Pages: 1-8
• [Presentation] 福島原発事故後の調査による子供一人あたりの給食摂取による内部被ばく線量評価 (2016)
  • Author(s): 太田智子・渡邉右修・太田裕二・岸本武士・越川昌義・小島健治・松田秀夫・太田博・樫原陽子
  • Organizer: 第86回日本衛生学会学術総会
  • Place of Presentation: 旭川市民文化会館
  • Year and Date: 2016-05-11
• [Presentation] 全国保育園給食を対象とした放射性物質の存在量と被ばく線量の実態 (2014)
  • Author(s): 太田智子
  • Organizer: 第73回 日本公衆衛生学会総会
  • Place of Presentation: 栃木県総合文化センター
  • Year and Date: 2014-11-05 – 2014-11-07
• [Presentation] 全国保育園給食を対象とした放射性物質の存在量と被ばく線量の実態 (2014)
  • Author(s): 太田智子
  • Organizer: 日本公衆衛生学会
  • Place of Presentation: 栃木県総合文化センター
• [Presentation] Evaluation of the committed effective dose do to food intake for Japanese adults before Fukushima nuclear plant accident and ongoing dose evaluation for children post Fukushima era. (2013)
  • Author(s): 太田智子
  • Organizer: ISTERH2013(Symposium)
  • Place of Presentation: 京王プラザホテル（Tokyo,Japan)
• [Presentation] Evaluation of the committed effective dose due to food intake for Japanese adults before Fukushima nuclear plant accident and ongoing dose evaluation for children post-Fukushima era. (2013)
  • Author(s): 太田智子
  • Organizer: ISTERH2013（Symposium)
  • Place of Presentation: KEIO PLAZA HOTEL