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Significant improvement of nuclear resonance fluorescence non-destructive assay by using the average resonance technique and photofission

Angell, C.; Hayakawa, Takehito; Shizuma, Toshiyuki; Hajima, Ryoichi

Non-destructive assay of $$^{239}$$Pu in spent nuclear fuel using traditional nuclear resonance fluorescence (NRF) suffers several limitations, including overcoming background of $$gamma$$-rays from the spent fuel, and the needing a large array of HPGe detectors. The average NRF method in a transmission measurement using quasi-monoenergetic $$gamma$$-ray beam overcomes these difficulties, while improving assay sensitivity. Photofission can also be used, enabling non-destructive assay using high flux, low duty-cycle $$gamma$$-ray sources.

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