Application of delayed neutron counting at CIAE

Delayed neutron counting (DNC) was applied in quantitative determination of ²³⁵U/²³⁸U, quantitative determination of ²³⁵U and ²³⁹Pu in ²³⁵U-²³⁹Pu co-existing samples at China Institute of Atomic Energy (CIAE). In this work, natural uranium, enriched uranium and their mixtures were used in the determinations of ²³⁵U/²³⁸U ratios. The results indicated that delayed neuron counting combined with neutron activation analysis(NAA) and k₀-NAA for the measurement of gamma rays emitted by ²³⁹U decay is suitable for fast determination ²³⁵U/²³⁸U ratio. In addition, the contents of ²³⁵U and ²³⁹Pu in ²³⁵U-²³⁹Pu co-existing samples can also be determined respectively. (author)