The following email has been sent to ITO, Hiroshi:
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Dear hiroshi ITO,
The submission of your abstract has been successfully processed.
Abstract submitted: https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts.
Status of your abstract: https://indico.cern.ch/event/192695/call- for-abstracts/307/.
See below a detailed summary of your submitted abstract:
Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics
Submitted by: ITO, Hiroshi
Submitted on: 27 February 2014 16:40
Title: Development of Real time 90Sr counter applying Cherenkov light detection
Abstract content Radioisotope have been emitted around Japan by a nuclear accident at the Fukushima No. 1 nuclear power plant in March 2011. A problem is the contaminated water including the atomic nucleus which relatively has a long half-life time such as <sup>90</sup>Sr, <sup>137</sup>Cs generated from <sup>235</sup>U used for nuclear fuel in particular. Particular, since <sup>90</sup>Sr has a long biological half-life time (49 years), it is dangerous to cause internal exposure. Therefore, real-time <sup>90</sup>Sr counter is required. It is relatively easy to identify a nucleus emitting gamma ray. But it is more difficult to identify a nucleus emitting pure beta ray such as <sup>90</sup>Sr. Typically, measurement of a radioactivity absolute value of <sup>90</sup>Sr takes a month at least to give a result. At first, we aim to identify <sup>90</sup>Sr/<sup>137</sup>Cs by threshold type Cherenkov detection. It needs radiator which has less than 1.0492 of refractive index for identification 2.28 MeV of maximum kinematic energy of beta ray from <sup>90</sup>Sr and 1.17 MeV of maximum kinematic energy of beta ray from <sup>137</sup>Cs. Recent, The material satisfying this request does not exist expect the silica aerogel. We produced prototype and evaluated performance. We achieved 10<sup>3</sup> of Sr/Cs detection efficiency ratio, 10<sup>-3</sup> Hz/ Bq of <sup>90</sup>Sr sensitivity at one minute.
Summary
Primary Authors: Mr. ITO, Hiroshi (Chiba University) hiroshi@hepburn.s.chiba-u.ac.jp
Co-authors: Mr. IIJIMA, Shutaro (Chiba University) ijima@hepburn.s.chiba-u.ac.jp Mr. HAN, Soorim (Chiba University) soorim@hepburn.s.chiba-u.jp Mr. KAWAI, Hideyuki (Chiba University) kawai@hepburn.s.chiba-u.ac.jp Mr. KODAMA, Satoshi (Chiba University) kodama@hepburn.s.chiba-u.ac.jp Mr. KUMOGOSHI, Daisuke (Chiba University) kumo@hepburn.s.chiba-u.ac.jp Mr. MASE, Keiichi (Chiba University) mase@hepburn.s.chiba-u.ac.jp TABATA, Makoto () makoto@hepburn.s.chiba-u.ac.jp
Abstract presenters: Mr. ITO, Hiroshi
Track classification: Technology transfer: 5b) Health and healthcare
Presentation type: Poster
Comments: