The following email has been sent to KAGAYA, Mika:
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Dear Mika Kagaya,
The submission of your abstract has been successfully processed.
Abstract submitted: https://indico.cern.ch/userAbstracts.py?confId=192695.
Status of your abstract: https://indico.cern.ch/abstractDisplay.py?abstractId=91&confId=192695.
See below a detailed summary of your submitted abstract:
Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics
Submitted by: KAGAYA, Mika
Submitted on: 30 January 2014 08:33
Title: Development of a High-Sensitive and Low-Cost Imaging Gamma-Ray Camera γI (Gamma Eye)
Abstract content We developed a Compton camera γI (Gamma Eye) using CsI(Tl) scintillators for measurement of arrival direction of gamma rays produced by radioactive cesium released into the environment from the Fukushima Dai-ichi Nuclear Power Plant accident due to the great east Japan earthquake and subsequent tsunamis in 2011. The radiation exposure of residents remains extremely a serious problem in Japan. The capability of gamma-ray imaging with good angular resolution is a key feature for identification of radiation hotspots and effective decontamination operation. A detector using Compton kinematics is one of the best candidates. Some Compton cameras for such purpose are being developed so far. However, they are not sufficient to cover a wide contamination area with the dose rate in air of <1µSv/hour around the Fukushima Power Plant because of their low detection efficiency and/or very high cost. Thus we developed a novel Compton camera I (Gamma Eye) with high sensitivity and low-cost. It consists of 2 arrays of detectors which act as a Compton scatterer and absorber. Energies deposited by Compton scattered electrons and subsequent photoelectric absorption measured by photomultipliers are used for image reconstruction. Each array consists of 8 large CsI(Tl) scintillator cubes, 3.5cm on a side, which are inexpensive and have good energy resolution. The 2 arrays are separated by 40cm to provide a 60-degree wide field of view as well as to keep position determination accuracy < 5 degree. The imaging capability was verified by test measurements in Fukushima Prefecture together with the laboratory tests.
Summary
Primary Authors: Ms. KAGAYA, Mika (Ibaraki University) 13nd401n@mcs.ibaraki.ac.jp
Co-authors: Prof. ENOMOTO, Ryoji (Tokyo University (ICRR)) enomoto@icrr.u-tokyo.ac.jp Prof. KATAGIRI, Hideaki (Ibaraki University) katagiri@mx.ibaraki.ac.jp Prof. MURAISHI, Hiroshi (Kitasato University) muraishi@ahs.kitasato-u.ac.jp Prof. YOSHIDA, Tatsuo (Ibaraki University) yoshidat@mx.ibaraki.ac.jp Prof. YANAGITA, Shohei (Ibaraki University) yanagita@mx.ibaraki.ac.jp Prof. TAKEDA, Toru (Kitasato University) t.takeda@kitasato-u.ac.jp Mr. NAKAYAMA, Kohei (Ibaraki University) 13nm164a@mcs.ibaraki.ac.jp
Abstract presenters: Ms. KAGAYA, Mika
Track classification: Sensors: 1d) Photon Detectors
Presentation type: --not specified--
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