Ultrasonically assisted conversion of uranium trioxide into uranium(VI) intrinsic colloids

Under oxidizing conditions, the corrosion of spent nuclear fuel may lead to the leaching of radionuclides including soluble uranyl-based species. The speciation of the generated chemical forms is complex and...

Study on Detection Method of Oxygen-Uranium Ratio of UO2-MO Pellets

In this paper, the determination method of the atomic ratio of oxygen to uranium in UO2-MO pellets was studied. Through the experiments of UO2-MO pellets with different composition ratios, the results showed that MO in UO2-MO pellets was a stable compound and did not participate in the thermogravimetric reaction. Only uranium dioxide was oxidized into stable uranium trioxide in oxygen. By accurately measuring the net weight of samples after dehydration and the total weight after oxidation, the formula for calculating the oxygen-uranium ratio of UO2-MO pellets is derived by formula derivation, and the RSD of this method is better than 0.13%.

A direct search for neutron nuclei in decay of 238U

An experiment in direct registration of neutron nuclei ([Formula: see text]) using a multineutron detector has been conducted for the first time. The results indicate the presence of hexaneutron and/or octaneutron emission in decay of [Formula: see text]U nuclei. The multineutron detector consisted of 20 3He-filled counters placed in a polyethylene moderator. Samples (emitters) of uranium trioxide (UO3) were used as sources of neutron nuclei. The experiment was conducted for a period of 112.66 days. Thus, the ratios of probabilities of hexaneutron and/or octaneutron emission by the [Formula: see text]U nuclei to the probabilities of [Formula: see text]-decay have been determined as upper bounds at a 90% confidence level: [Formula: see text] and [Formula: see text].