Nondestructive detection of heavily shielded materials by using nuclear resonance fluorescence with a laser-Compton scattering -ray source

レーザーコンプトン線源による光核蛍光散乱を利用した厚い遮蔽容器中に保管された物質の非破壊検出

菊澤 信宏 ; 羽島 良一; 西森 信行; 峰原 英介; 早川 岳人; 静間 俊行; 豊川 弘之*; 大垣 英明*

Kikuzawa, Nobuhiro; Hajima, Ryoichi; Nishimori, Nobuyuki; Minehara, Eisuke; Hayakawa, Takehito; Shizuma, Toshiyuki; Toyokawa, Hiroyuki*; Ogaki, Hideaki*

We perform a proof-of-principle experiment for a nondestructive method for detecting the elemental and isotopic composition of materials concealed by heavy shields such as iron plates with a thickness of several centimeters. This method uses nuclear resonance fluorescence (NRF) triggered by an energy-tunable laser-Compton scattering (LCS) -ray source. One-dimensional mapping of a lead block hidden behind 1.5-cm-thick iron plates is obtained by measuring an NRF -ray of a lead isotope Pb. We observe a 5512-keV -ray from Pb excited by the quasi-monochromatic LCS -rays with energies up to 5.7 MeV. The edge position of the lead block is consistent with the exact position within the uncertainty.