- 著者
- 佐波 俊哉 佐々木 慎一 飯島 和彦 岸本 祐二 齋藤 究
- 出版者
- Atomic Energy Society of Japan
- 雑誌
- 日本原子力学会和文論文誌 (ISSN:13472879)
- 巻号頁・発行日
- vol.10, no.3, pp.163-169, 2011 (Released:2011-07-29)
- 参考文献数
- 6
- 被引用文献数
- 11 12
The time variations in the dose rate and γ spectrum of radio nuclides originating from the accident of Fukushima Daiichi Nuclear Power Station were measured at Tsukuba City, Ibaraki, during the period from 15th March to 9th April 2011. The radiation dose peaked three times during the period from 15th to 16th March (1.27 μSv/h at maximum). The contribution of Xe-133 to the dose rate was observed from the γ spectrum obtained from the 5 h measurement during the peaks on 15th and 16th March, indicating that radioactive plume passed through Tsukuba City at that time. After the peaks, a dose rate increase with rainfall was observed on 21th March, dominating the integral dose rate measured at Tsukuba City. The dose after the rainfall comes from I-131, Cs-134, and Cs-137 that can be observed as peaks in the spectra.
- 著者
- パーカー ジョセフ ドン 身内 賢太朗 水本 哲矢 西村 広展 奥 隆之 澤野 達哉 篠原 武尚 鈴木 淳市 高田 淳史 谷森 達 上野 一樹 原田 正英 池野 正弘 田中 真伸 内田 智久 服部 香里 岩城 智 株木 重人 岸本 祐二 窪 秀利 黒澤 俊介 松岡 佳大
- 出版者
- 日本中性子科学会
- 雑誌
- 波紋 (ISSN:1349046X)
- 巻号頁・発行日
- vol.23, no.3, pp.218-222, 2013
<p>We have developed a prototype time-resolved neutron imaging detector employing a micro-pattern gaseous detector known as the micro-pixel chamber (μPIC) coupled with a field-programmable-gate-array-based data acquisition system. Our detector system combines 100μm-level spatial and sub-μs time resolutions with a low gamma sensitivity of less than 10<sup>-12</sup> and high data rates, making it well suited for applications in neutron radiography at high-intensity, pulsed neutron sources. In the present paper, we introduce the detector system and present several test measurements performed at NOBORU (BL10), J-PARC to demonstrate the capabilities of our prototype. We also discuss future improvements to the spatial resolution and rate performance.</p>