A comparative study of some nuclear methods for235U/238U isotopic ratios determination |
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Authors: | M B A Vasconcellos M J A Armelin A M G Figueiredo B P Mazzilli M Saiki |
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Institution: | (1) Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, Pinheiros 01000, Caixa Postal 11049, São Paulo, SP, (Brasil) |
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Abstract: | In the present work, a comparative study is made among nuclear methods for235U/238U ratios determination: activation analysis followed by high-resolution gamma-ray spectrometry, delayed neutron counting, passive gamma-ray and alpha spectrometry. Activation analysis followed by high-resolution gamma-ray spectrometry yielded a relative standard deviation down to 0.1% and a relative error of about 1% for standards of uranium enriched to 14%. Passive gamma-ray spectrometry using Ge(Li) detectors yielded a relative error down to 0.1% for enriched uranium and values even lower for the standard deviation. Passive gamma-ray spectrometry using Low Energy Photon Detector (LEPD) yielded a precision of 0.2% and a still better accuracy for enriched standards. In the case of alpha spectrometry, a relative error down to 0.5% and a precision of about 1% were obtained, also for enriched uranium standards. Delayed neutron counting allowed a relative standard deviation of about 7% and a relative error of about 2%, for standards of depleted uranium. |
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