title: Nondestructive detection of hidden chemical compounds with laser Compton-scattering gamma rays.
abstract: A nondestructive 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+/-0.12 is consistent with (C/N)(melamine)=0.5.
authors.affiliation: Advance Photon Research Center, Japan Atomic Energy Agency, Kizugawa, Kyoto 619-0215 Japan. hayakawa.takehito@jaea.go.jp
authors.forename: Takehito
authors.initials: T
authors.lastname: Hayakawa
authors.forename: Hideaki
authors.initials: H
authors.lastname: Ohgaki
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Shizuma
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Hajima
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Kikuzawa
authors.forename: Eisuke
authors.initials: E
authors.lastname: Minehara
authors.forename: Toshiteru
authors.initials: T
authors.lastname: Kii
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Toyokawa