Development of measurement system of radioactive plume using unmanned airplane in the fiscal year 2017 (Contract research)

Sanada, Yukihisa; Nishizawa, Yukiyasu*; Ochi, Kotaro; Yuki, Yoichi*; Ishizaki, Azusa; Osada, Naoyuki*

JAEA-Research 2018-009, 48 Pages, 2019/01

JAEA-Research-2018-009.pdf:14.77MB

At the accident of nuclear facilities, a prediction of the behavior of released radioactive plume is indispensable to make a decision on a refuge plan of inhabitants. Currently, prediction system which is based on atmospheric dispersion simulation has been implemented as a tool of the atomic energy disaster prevention. However, the direct measurement method of the radioactive plume has not existed. In this study, some component technologies were developed for the establishment of direct measurement methods of radioactive plume using unmanned aerial vehicle whose technological innovation is remarkable. In addition, the spray test using mock aerosol was conducted to obtaining the deposition rate to the airplane body. The algorism of making a flight plan was developed based on a prediction model of the radioactive plume. This report summarized the outcome of the second year of the three-year plan.

Radiation monitoring using an unmanned helicopter in the evacuation zone around the Fukushima Daiichi Nuclear Power Plant

Sanada, Yukihisa; Kondo, Atsuya*; Sugita, Takeshi*; Nishizawa, Yukiyasu; Yuki, Yoichi*; Ikeda, Kazutaka*; Shoji, Yasunori*; Torii, Tatsuo

Exploration Geophysics, 45(1), p.3 - 7, 2014/11

https://doi.org/10.1071/EG13004

The Great East Japan Earthquake on March 11, 2011 generated a series of large tsunami waves that resulted serious damage to the Fukushima Daiichi Nuclear Power Plant (NPP) and a large amount of radioactive materials were discharged from the NPP to the environment. In recent years, technologies for an unmanned helicopter have been developed and applied to various fields. In expectation of the application of the unmanned helicopter to airborne radiation monitoring, we had developed a radiation monitoring system. Then, we measured the radiation level by using unmanned helicopter in soil contaminated areas by radioactive cesium emitted from the NPP to evaluate ambient dose-rate distribution around the areas. Here, we reports on the measurement technique and the result.

New method to measure the rise time of a fast pulse slicer for laser ion acceleration research

Mori, Michiaki; Yogo, Akifumi; Kiriyama, Hiromitsu; Nishiuchi, Mamiko; Ogura, Koichi; Orimo, Satoshi; Ma, J.*; Sagisaka, Akito; Kanazawa, Shuhei; Kondo, Shuji; et al.

IEEE Transactions on Plasma Science, 36(4), p.1872 - 1877, 2008/08

https://doi.org/10.1109/TPS.2008.2000886

A dependence of cut-off proton kinetic energy on laser prepulse duration has been observed. ASE pedestal duration is controlled by a fast electro-optic pulse slicer where the risetime is estimated to be 130 ps. We demonstrate a new correlated spectral technique for determining this risetime using a stretched, frequency chirped pulse.

Applicability of airborne geophysics (DighemV) in a granite area, 2; Airborne magnetic and radiometric surveys

Hasegawa, Ken; Matsuoka, Toshiyuki; Yuki, Yoichi*

Shadan Hojin Butsuri Tansa Gakkai Dai-116-Kai (Heisei-19-Nendo Shunki) Gakujutsu Koenkai Rombunshu, p.163 - 166, 2007/05

Airborne magnetic and radiometric surveys were conducted in the region of the Toki granite. The shaded relief map of the magnetic survey data shows that the magnetic susceptibility of the Toki granite is not uniform, and a relatively high magnetic susceptibility zone was identified. Moreover, it was shown that the Toki granite can be separated into three parts; one with high U abnormality, another with high Th abnormality, both separated by a middle region. The area with high magnetic susceptibility in the Toki granite correspond to where the thickness of the layer of the Mizunami and/or the Seto Group is thin and the depth of the Toki granite is shallow, and the region corresponds to high U abnormality. We conclude the Toki Granite is not homogeneous with respect to geophysical properties, but instead is composed of separate regions.

Optimization of the target parameter for the phase rotation experiment by using proton beam driven by 100-TW class Ti:Sa laser

Mori, Michiaki; Ogura, Koichi; Sagisaka, Akito; Orimo, Satoshi; Takai, Mamiko; Yogo, Akifumi; Kiriyama, Hiromitsu; Ma, J.-L.; Kanazawa, Shuhei; Kondo, Shuji; et al.

no journal, , 

no abstracts in English

Simultaneous imaging with a proton beam and an X-ray driven by a fs-intense laser

Orimo, Satoshi; Yogo, Akifumi; Ogura, Koichi; Sagisaka, Akito; Mori, Michiaki; Kiriyama, Hiromitsu; Kondo, Shuji; Yamamoto, Yoichi*; Shimomura, Takuya*; Tanoue, Manabu*; et al.

no journal, , 

We are investigating an intense fs-laser driven MeV proton source using a thin foil, and its applications. Simultaneous imaging of a sample with a proton and an X-ray beams has been demonstrated by a ultra-short pulse higt intensity Ti:Sapphire laser systems at JAEA and GIST. For generating a short-pulse proton beams and X-rays, an intense laser pulse irradiates a tape targets. The p-polarized laser pulse with 50 mm diameter is focused onto the cupper tape target at 45 degree incident angle with focal length of 238 mm (F/4.8), giving an intensity on target of 3-910W/cm10. The cupper and polyimide tape was 5, 7.5 micron in thickness and 20 mm in width. The target system supplies a fresh surface to the focus spot at every shot. We obtained simultaneously the projection image of a Ni mesh pattern having a periodically structured pattern by the proton detected CR39 and X-rays detected on imaging plate.

Energetic proton beam generation driven by J-KAREN laser

Mori, Michiaki; Yogo, Akifumi; Orimo, Satoshi; Ogura, Koichi; Sagisaka, Akito; Nakamura, Shu*; Shirai, Toshiyuki*; Iwashita, Yoshihisa*; Noda, Akira*; Oishi, Yuji*; et al.

no journal, , 

no abstracts in English

Laser ion acceleration from a near-critical density plasma

Yogo, Akifumi; Mori, Michiaki; Kiriyama, Hiromitsu; Ogura, Koichi; Sagisaka, Akito; Orimo, Satoshi; Pirozhkov, A. S.; Esirkepov, T. Z.; Bulanov, S. V.; Kanazawa, Shuhei; et al.

no journal, , 

no abstracts in English

Detailed distribution measurement of the radiation dose-rate in the evacuation zone by using unmanned helicopters

Sanada, Yukihisa; Torii, Tatsuo; Kondo, Atsuya; Ikeda, Kazutaka*; Yuki, Yoichi*

no journal, , 

no abstracts in English