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冨田 豊; 熊田 政弘; 若林 修二; 木島 佑一; 山本 洋一; 小田 哲三
no journal, ,
A SAUNA system was installed for monitoring of radioxenon at the Takasaki IMS station (JPX38) in Japan in December, 2006. The test operation had been performed from 2007 to 2014, and valuable monitoring data and operation and maintenance experiences were obtained. Though the CTBTO planned to start system upgrade of the JPX38 for certification in April, 2013, the upgrade plan was postponed since JPX38 detected radioxenon isotopes early in April, 2013, which were derived from the third nuclear test announced by North Korea. To prevent missing data during the period of upgrade, the TXL was installed near JPX38 as an alternative measurement system and started to operate in January, 2014. The JPX38 upgrade was carried out from January to April, 2014 to replace some parts with new ones and to implement some new functions. Stability and reliability of the JPX38 are definitely increased by these improvements. JPX38 obtained the certification on December 19, 2014.
米田 政夫; 田辺 鴻典*; 藤 暢輔
no journal, ,
For the social diffusion of low-cost and transportable devices for detecting nuclear materials, we have developed a novel approach called the active rotation method, which utilizes a rotating neutron source near the object being measured to detect nuclear materials. The device to rotate a neutron source can be produced at low-cost and it is compact. A neutron source is rotated with several thousand rpm at measuring, and it is possible to detect nuclear materials by confirming the deformation of the time-distribution spectrum obtained by a neutron detector. In addition to the rotation device, we have also developed a low-cost neutron detector utilizing water Cherenkov radiation. In the presentation, we will introduce this newly developed a rotation device and demonstrate its nuclear material detection capabilities. The measurement system consists of a rotation device and a water Cherenkov detector for a neutron detector. The measurement object is a polyethylene container containing 7 g of Pu-239. As a result of the experiment, we confirmed the successful detection of nuclear material using our device. The system is compact, transportable, and significantly less expensive than traditional methods, making it a promising solution for nuclear security applications.