Microwave plasma torch（MPT）is a new type of plasma excitation source developed by domestic research team. It is a soft ionization technology with atmospheric ionization characteristics and is mostly used for the analysis of organic matter. Compared with inductively coupled plasma（ICP）ionization sources，MPT has low ionization energy and is difficult to ionize the tested elements into metal ions，which limits its application in inorganic detection. In order to broaden the application range of MPT source，linear ion trap mass spectrometry（LTQ-MS）was used to establish a quantitative analysis method for zirconium，which was applied to environmental monitoring. The zirconium solution was introduced into the MPT-LTQ-MS experimental device，and the aerosol was produced by pneumatic atomization. After drying by concentrated sulfuric acid，the dried aerosol formed anions in the plasma flame generated by the microwave plasma moment，and was detected by LTQ-MS in the negative ion mode. The experimental results show that part of the excited zirconium ion can basically be confirmed to exist in the form of [ZrO(NO₃)₃]^-. This composite anion can be used as the characteristic signal to detect zirconium in water samples，and can be quantitatively analyzed by the characteristic spectral peak of multi-stage mass spectrometry. The characteristic signal of m/z 292 （⁹⁰Zr）showed a good linear correlation with the concentration of zirconium in the concentration range of 5~100 μg·L^-1(R²=0.998 8). The limit of detection (LOD) of the method was 2.6 μg·L^-1，and the precision (RSD) was better than 8.9 %. The content of zirconia in surface water was determined by MPT-LTQ-MS，ranging from 0.34 to 3.22 μg·L^-1，and the recovery of standard addition was 94 % to 105 %. The results show that MPT-LTQ-MS can be used as a simple method for the determination of zirconium，and can be used in environmental monitoring and drinking water testing.

Hydrogeological conditions are crucial for the site selection and long-term safety assessment of high-level radioactive waste (HLW) disposal repositories. This study focuses on the groundwater circulation characteristics of Xinchang preselected site and its southern periphery of the Beishan area for HLW disposal. A comprehensive approach employing multiple environmental isotopes, hydrodynamics, and numerical modelling was used to investigate groundwater circulation within the study area. Results indicated that groundwater in shallow loose sediments exhibited relatively rapid renewal rates, with an average age generally less than 30 years. The apparent ¹⁴C age of deep bedrock groundwater generally exceeding 10 ka within the underground research laboratory (URL) site. There was no evidence of contributions from deep crustal or mantle sources to groundwater within the region. Within the Xinchang site, the groundwater head shows pronounced vertical stratification, with a higher hydraulic head in shallow zones than in deeper ones. Groundwater in boreholes distant from the gully shows weak hydraulic connectivity with precipitation, and the groundwater level often exhibits periodic fluctuations. The groundwater flow systems can be categorized into three types: regional, intermediate, and local. The local flow system was the most active, accounting for over 80 % of the total flux. These characteristics showed that the hydrogeological conditions in the study area were favorable for the geological disposal of HLW.

This study monitored the activity concentrations of radionuclides in seepage water from a decommissioned uranium tailings pond，analyzed the temporal trends of radionuclide concentrations in seepage water from 2020 to 2024，and investigated the correlations between radionuclides in seepage water and monitoring well water to evaluate the radiological impact of seepage on surrounding groundwater. The results showed that the seepage water contained uranium at concentrations ranging from 15.1 to 397 μg·L^-1，²²⁶Ra from 0.008 to 0.176 Bq·L^-1，²¹⁰Pb from 0.007 to 0.172 Bq·L^-1，and ²¹⁰Po from 0.004 to 0.021 Bq·L^-1，levels of ²²⁶Ra，²¹⁰Pb，and ²¹⁰Po are all below regulatory limits. In monitoring well water，uranium concentrations ranged from 0.21 to 2.98 μg·L^-1，²²⁶Ra from 0.006 to 0.023 Bq·L^-1，²¹⁰Pb from 0.004 to 0.131 Bq·L^-1，and ²¹⁰Po from 0.002 to 0.011 Bq·L^-1，all consistent with local background levels. Analysis using the Mann-Kendall test revealed no significant temporal trends for uranium and ²²⁶Ra in seepage water，while ²¹⁰Pb and ²¹⁰Po concentrations exhibited declining trends and become stable. According to the evaluation results of Spearman correlation coefficient, the Spearman correlation coefficient ρ_s for uranium，²²⁶Ra，²¹⁰Pb，and ²¹⁰Po in the seepage water and monitoring well water were 0.314 3，0.074 4，0.939 5，and 0.460 5，respectively. Significant positive correlations were observed between ²¹⁰Pb and ²¹⁰Po in monitoring well water and their counterparts in seepage water. These findings provided critical data and regulatory guidance for authorities and enterprises to strengthen radiation environmental monitoring and implement targeted management strategies, thereby mitigating potential risks to groundwater safety around uranium tailings facilities.

CO₂ is the main component of non-condensable gas in high-temperature geothermal fluid and its existence still have important impact on geothermal development. Determining its content in high-temperature geothermal fluid is of great significance for geothermal development. The conventional sampling and testing analysis of CO₂ content determination has some drawbacks, such as insufficient sampling representativeness，cumbersome implementation process and high sampling cost. Based on the pressure-temperature measurement in the wellbore during discharge tests and two-phase flow calculation, this paper proposed a new method to determine CO₂ content in the geothermal reservoirs. This method only uses a large number of relatively reliable measured data of temperature and pressure, it has low cost, strong practicability and good reliability. This paper first describes the pressure-temperature measurement during discharge tests. Then constructs a model that solves the two-phase flow in the geothermal wellbore, which was verified by comparison with the commercial software WELLSIM, and determine CO₂ content by using both the wellbore pressure-temperature measurement and model calculation data. Finally, the method was tested and verified by using the measured data from Gulu geothermal field in Tibet and the Ziledaer geothermal field in Turkey, and the CO₂ contents in the geothermal reservoir were determined to be 1.1 % and 3.2 % respectively.

In order to understand the current situation of the air absorption dose rate level from terrestrial γ-radiation in Yinchuan, master the distribution pattern of surface γ-radiation，evaluate the external exposure level of residents，gradually establish and improve the environmental radiation background database of the whole city of Yinchuan，Ningxia，and provide technical support for ensuring the health and safety of the public and the development of urban construction，and provide a basis for government decision-making, Evenly measuring grid method was used to cover the measurement area of the air absorption dose rate of surface γ-radiation in Yinchuan city. The dose rate levels of different administrative regions，different environmental conditions，different soils and materials in Yinchuan city were collected and summarized, the effective dose received by residents was estimated. The survey results indicate that the average terrestrial gamma radiation absorbed dose rate in Yinchuan (after deducting cosmic ray contributions) is 48.67 nGy·h^-1，primarily attributed to ⁴⁰K. This value closely aligns with the regional average in Ningxia Hui Autonomous Region but is significantly lower than the national average. The resultant annual effective dose to the public is calculated as 0.30 mSv，which is lower than both the per capita annual dose from terrestrial radiation in China (0.46 mSv) and the outdoor gamma radiation dose in Ningxia (0.55 mSv).

Under the background of developing digital economy，the digital transformation of uranium exploration is facing structural imbalances，manifested as core contradictions such as the difficulty in integrating multi-source data，technology fragmentation，and the disconnection between data flow and business flow. This paper focused on the application requirements of digital exploration technology，proposes an information architecture model of “business logic reconstruction-data asset governance-technology middle platform empowerment”as a trinity，and designed the overall blueprint of the “54321 Project”，covering five types of application systems，four supporting systems，three platforms，two types of centers and one full-process data chain, so as to solve the problem of the broken chain of“data-knowledge-decision”. The closed-loop optimization of business flow，data flow and decision-making flow was achieved through a four-dimensional collaborative architecture system. Through the data middle platform and cloud platform，the management domain and the production domain are deeply coupled. A technical support system centered on the integration and application of multi-source data is constructed，forming an integrated data ecosystem of “mining-storage-treatment-utilization”，providing a replicable theoretical framework and practical paradigm for the digital transformation of uranium ore exploration.

Dalishu uranium deposit is a carbonate rock type uranium deposit located at the Lukan fault hanging wall in the southeast limb of Xiongwu anticline. Researches on this uranium deposits are still seldom reported. Based on the field geological survey and collection of uranium ore samples in trenches and boreholes, this paper conducted a study on mineralogy，geochemistry，and genesis of the deposit. The study show that the ore body is controlled by the northeast-trending faults and the secondary Si-Ca structural planes and closely related to organic matters. The main uranium minerals in the ore are pitchblende and uraninite，and the uraninite minerals,which are closely associated with pyrite and “black”organic matters. The trace elements such as V，Cr，Co，Ni，Cu，Zn，and Mo are enriched in the ore and the wall rocks.The rare earth element distribution pattern is“right-inclined” with the enrichment of LREE and negative δEu anomaly，indicating a certain genetic relationship with the Cambrian black rock series. It believed that the ore-forming materials maybe come from the Cambrian Niutitang and Laoba formation，the deposit was formed by deep hydrothermal action which extracted the uranium from the Cambrian basement ore-forming materials and carried to favorable areas under the orogenic background of Himalayan period.

The Ordos basin is the second largest energy basins in China，and several large uranium ore deposits have been discovered. The upper member of Lower Cretaceous Huanhe formation in the basin is the main prospecting horizon. In this paper，the uranium mineralization characteristics and metallogenic mechanism of Lower Cretaceous Huanhe formation in northern Ordos basin are studied by means of geological characteristics，altered mineral association，rock geochemistry and the metallogenic model is established. The three superimposed system domains of Lower Cretaceous Huanhe formation formed a fine-coarse-fine stratigraphic structure，which provided a foundation for the migration of uranium ore-forming fluids in the later period. In the early stage of mineralization，the scale of the oxidation zone was limited，and the main alteration minerals were hematite，limonite，pyrite，chalcopyrite，sphalerite，calcite and coffinite，etc. The metallogenic environment were of strong reducing capacity，the ore-forming fluid were strongly alkaline，and intense water-rock interaction occured. In the middle and late stage of mineralization，the oxidation zone advanced into the basin，a strong REDOX reaction developed ，the primary ore zone and reduction zone were formed，and the metallogenic environment maintained the early strong reducibility. The main altered minerals in this period were hematite，limonite，pyrite，montmorillonite，chlorite and uranite. With the mixing of ore-forming fluids，ore-forming fluids gradually turn to weak alkaline，uranyl silicate ions decomposed，and a large amount of uranite was formed.

To accurately measure the oxidation-reduction potential of uranium ore geological samples, this study try to explore a better measurement method and experimental conditions by comparing and analyzing the application effects of the acidic potassium dichromate method and the alkaline potassium permanganate method in the measurement of the oxidation-reduction potential of uranium ore geological samples. The potential drop method was used to systematically conduct a multi-dimensional comparison between the acidic potassium dichromate method and the alkaline potassium permanganate method. The aspects of comparison included solution stability, optimal solution concentration, sample soaking time，solid - liquid ratio, and electrode equilibrium time. The sample soaking time and electrode equilibrium time of the alkaline potassium permanganate method are shorter than those of the acidic potassium dichromate method, allowing it to reach a stable and reliable potential value more quickly. For strongly reducing samples，the ΔEh value obtained by the acidic potassium dichromate method is larger. However, the evaluation conclusions of the two methods regarding the reduction ability of the samples are consistent. Nevertheless, the precision of the alkaline potassium permanganate method is better.The optimal experimental conditions for the alkaline potassium permanganate method are as follows: a concentration of 0.03 mol∙L^-1, a sample soaking time of 1.5 h，a solid-liquid ratio of 1:25, an electrode equilibrium time of 5 min, a reaction medium of 0.2 % potassium hydroxide solution, and a temperature of (25±1) °C. The ΔEh value measured by this method is basically consistent with the judgment results of the oxidation - reduction environment by the oxidation coefficient method (Fe²⁺/Fe³⁺), and is also basically consistent with the color of the samples.Based on comprehensive experimental indicators, the overall performance of the alkaline potassium permanganate method is superior to that of the acidic potassium dichromate method in the measurement of the oxidation - reduction potential of uranium ore geological samples. By adopting the optimal experimental conditions, the accurate measurement of the oxidation - reduction potential of uranium geological samples is achieved, providing reliable technical support for uranium ore geological research.

As the field verification standard for radioactive measuring instruments such as gamma loggers in uranium exploration work，radium sources have played a good role in controlling the metrological performance of the instruments. However，due to national security and environmental protection policies，the existing number of solid radium sources in China can hardly meet the increasing demand of uranium exploration workload，and there is an urgent need to carry out the development of alternative verification devices. It is planned to use natural uranium ore powder and other materials to develop verification devices to verify the radioactivity measuring instruments during the period. Based on the theory of γ radiation field，the relationship between the geometry of the verification device and the internal γ field was calculated，and it was experimentally verified that an annular column verification device with an internal bore diameter of 50 mm and an axial length of 600 mm can ensure that the center of the verification device has a saturated plateau area of 200 mm，leaving at least 100 mm redundancy for convenient detector placement. The internal irradiation volume rate is positively correlated with the thickness of the horizontally oriented ore layer before the saturation thickness is reached. The practical geometry of the γ logger verification device was determined by theoretical calculations，avoiding the waste of material and time in a large number of conservative designs.