A SCREENING SURVEY EXERCISE FOR THYROID INTERNAL EXPOSURE FROM RADIOIODINE AFTER A NUCLEAR ACCIDENT. Issue 4 (10th May 2018)

• Record Type: Journal Article
• Authors: Yajima, Kazuaki; Kim, Eunjoo; Tani, Kotaro; Tatsuzaki, Hideo; Li, Chunsheng; Kurihara, Osamu
• Is Part Of: Radiation protection dosimetry. Volume 183:Issue 4(2019)
• Page Start: 483
• Page End: 488
• Publication Date: 2018-05-10
• Subjects: Radiation dosimetry -- Periodicals; Radiation -- Safety measures -- Periodicals; 363.1799
• DOI: 10.1093/rpd/ncy175
• Languages: English
• ISSNs: 0144-8420

Abstract

Abstract: In the aftermath of the 2011 Fukushima nuclear disaster, a screening survey for thyroid internal exposure from intake of radioiodine was performed on 1080 children using handheld NaI(Tl) survey meters. This article presents the design and results of a practical exercise conducted to develop the skills of personnel who would be potentially engaged in such a survey. Participants of this exercise were asked to measure manikin heads in which point sources were installed under normal (~0.05 μSv h −1 ) and elevated (~0.5 μSv h −1 ) background conditions. The results demonstrated that the measurements were less dependent on the background radiation level, and the deviation of net signals obtained by the participants were within 10–20% for dose rates above 0.2 μSv h −1 . This result suggests that dose rates can be reliably obtained above a provisional operational intervention level for the device, 0.5 μSv h −1 under a real nuclear accident situation.