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Report No.
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Measuring isotopic abundance using nuclear resonance fluorescence

Omer, M. ; Shizuma, Toshiyuki*; Hajima, Ryoichi*; Koizumi, Mitsuo 

Nuclear resonance fluorescence (NRF) is a phenomenon that a nuclide-specific gamma-ray is resonantly absorbed and re-emitted. This method is considered useful for the nondestructive detection of nuclear materials. In order to demonstrate how accurate the NRF method is able to measure the isotopic abundance, we performed NRF experiments on natural tungsten and hafnium as surrogates of nuclear materials at the high intensity gamma-ray source (HI$$gamma$$S), Duke University. In the energy range of 2.5 - 3 MeV, NRF peaks were observed for three and two isotopes of tungsten and hafnium; respectively. Accuracy of the method will be discussed at the meeting. This work is performed under the subsidiary for promotion of strengthening nuclear security of MEXT.

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