Proposal of nondestructive radionuclide assay using a high-flux -ray source and nuclear resonance fluorescence

大強度線源と核共鳴散乱に基づく放射性核種の非破壊検出法の提案

羽島 良一; 早川 岳人; 菊澤 信宏 ; 峰原 英介

Hajima, Ryoichi; Hayakawa, Takehito; Kikuzawa, Nobuhiro; Minehara, Eisuke

エネルギー回収型リニアックの高輝度大電流電子ビームと先進レーザ技術を組合せたレーザコンプトン散乱で、大強度準単色線の発生が可能になる。この線を光源として核共鳴散乱の反応を起こすことで、同位体の非破壊分析が可能になる。本論文では、光源の構成と性能を述べ、核燃料サイクルから排出される放射性廃棄物を対象とした非破壊分析の検出限界を議論する。

A nondestructive assay system for radioactive waste management is proposed. The system utilizes nuclear resonance fluorescence triggered by a quasi-monochromatic high-flux -ray generated from Compton scattering of laser photons by relativistic electrons. We employ an energy-recovery linac as an electron source and a mode-locked fiber laser followed by a laser supercavity as a photon source. The combination of these novel technologies realizes a -ray flux much higher than existing sources using electron storage rings. The proposed -ray source produces a quasi-monochromatic ray with a flux of /s/keV, which is high enough for industrial applications such as nondestructive analysis of radionuclides in nuclear waste and interrogation of fissile material in cargoes. The nuclear resonance fluorescence triggered by quasi-monochromatic -rays provides a versatile method of nondestructive analysis of both radioactive and stable nuclides.