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Nondestructive detection of hidden chemical compounds with laser Compton-scattering $$gamma$$ rays

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

A non-destructive assay method for measuring a shielded chemical compound has been proposed. The chemical compound is measured by using a nuclear resonance fluorescence (NRF) measurement technique with an energy tunable laser Compton scattering (LCS) $$gamma$$-ray source. This method has an advantage that hidden materials can be detected through heavy shields such as iron plates of a thickness of several centimeters. A detection of a chemical compound of melamine, C$$_{3}$$H$$_{6}$$N$$_{6}$$, shielded by 15-mm-thick iron and 4-mm-thick lead plates is demonstrated. The NRF $$gamma$$-rays of $$^{12}$$C and $$^{14}$$N of the melamine are measured by using the LCS $$gamma$$-rays of the energies of up to 5.0 MeV. The observed ratio ($$^{12}$$C/$$^{14}$$N)$$_{exp}$$ = 0.39 $$pm$$ 0.12 is consistent with (C/N)$$_{melamine}$$ = 0.5.

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