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CO2+O2 in situ leaching uranium mine is the representative of the third generation uranium mining and metallurgy technology in China. In terms of radiation protection, the radon emission and the effective dose of the public are significantly lower than that of the second generation uranium mining and metallurgy technology. The production wells are semi-closed system distributed in the lixiviating well field, which has the characteristics of dispersing radioactive radon. In front of lacking pproaches and basic data of radon discharge from production wells, a theoretical model is developed and which is verified with the field monitoring data. It was concluded that 30.83 GBq/a of radon discharges from the production wells, and the normalized release was 0.085 TBq/tU. It fully proves the advantages of CO2+O2 leaching uranium, and provides a method reference and data basis for the release of uranium radon.

Strontium is one of the main radionuclide in wastewater from nuclear power plants. A new strongly acidic cation exchange resin of LewatitSM 1000KR was used to adsorb Sr2+, and the resin after adsorbing Sr2+ was volume-reduced and cured. The results showed that the maximum adsorption capacity of LewatitSM 1000KR resin for Sr2+ was 35.82 mg/mL at 308 K. The volume of the resin after adsorption of Sr2+ was reduced by 80% after calcination at 900 °C, while the content of Sr2+ in the resin was unchanged. This research provides a new idea for the solidification of radioactive strontium. [ABSTRACT FROM AUTHOR]

Nuclear facilities are widely used in fields such as national defense, industry, scientific research, and medicine, which play a huge role in military and civilian use. However, in the process of widespread application of nuclear technology, uranium and its compounds with high carcinogenic and biologically toxic cause a lot of environmental problems, such as pollutions of water, atmosphere, soil, or ecosystem. Bioensors with sensitivity and specificity for the detection of uranium are highly demand. Nucleic acid enzymes (DNAzyme) with merits of high sensitivity and selectivity for targets as excellent molecular recognition elements are commonly used for uranium sensor development. In this perspective review, we summarize DNAzyme-based biosensors for the quantitative detection of uranyl ions by integrating with diverse signal outputting strategies, such as fluorescent, colorimetry, surface-enhanced Raman scattering, and electrochemistry. Different design methods, limit of detection, and practical applications are fully discussed. Finally, the challenges, potential solutions, and future prospects of such DNAzyme-based sensors are also presented., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Bai, Xu, Chai, Zhou, Jiang and Zhang.)