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Report No.

Significantly improving nuclear resonance fluorescence non-destructive assay by using the integral resonance transmission method and photofission

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

Non-destructive assay (NDA) of $$^{239}$$Pu in spent nuclear fuel or melted fuel using a $$gamma$$-ray beam is possible using the self interrogation method. The method uses nuclear resonance absorption where resonances in $$^{239}$$Pu remove photons from the beam, and the selective absorption is detected by measuring the decrease in scattering in a witness target placed in the beam after the fuel, consisting of the isotope of interest, namely $$^{239}$$Pu. The method is isotope specific, and can use photofission or scattered $$gamma$$-rays to assay the $$^{239}$$Pu. It overcomes several problems related to NDA of melted fuel, including the radioactivity of the fuel, and the unknown composition and geometry. This talk will explain the general method, and how photofission can be used to assay specific isotopes, and present example calculations.



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