Objective: To explore the effect of three-dimensional echocardiography (RT-3DE) for evaluating right atrial function in patients after atrial septal defect (ASD) closure.
Methods: Our research included 2 group: ASD group,n=50 patients with successful ASD closure and Control group, n=30 normal subjects from physical examination. RT-3DE was conducted at pre-operation and at 3 days, 1 month, 3 months post-operation; the volume of right atrium before contraction (Vpre), minimum volume of the right atrium (Vmin), maximum volume of the right atrium (Vmax), total emptying volume of right atrium (Vt), total emptying volume fraction of right atrium (Ft), active emptying volume fraction (Fa) and passive emptying volume fraction (Fp) were measured and compared between 2 groups at pre- and post-operation respectively.
Results: At pre-operation, compared with Control group, ASD group had increased Vmax, Vmin, Vpre, Vt, and Fa, while decreased Ft and Fp, allP<0.05. At 3 days post-operation, compared with Control group, ASD group had increased Vmax, Vmin, Vpre, Vt, and Fa, while decreased Ft and Fp, allP<0.05. Compared with pre-operation, ASD group had decreased post-operative Vmax, Vmin, Vpre, Vt and Fa while increased Ft and Fp at 3 time points, allP<0.05. At 3 months post-operation, the above 7 indexes were similar between ADS group and Control group,P>0.05.
Conclusion: ADS patients had abnormal volume and function in right atrium, the abnormalities could be improved at 3 days after ASD closure and could be recovered to normal level at 3 months after operation. RT-3DE has the important role for evaluating right atrial volume and function in patients after ASD closure.

Based on the concept of environmental factors of ICF, together with the practice of environmental assessment and reform in the recent years, this paper discussed the principle, specification, procedures and content of environmental assessment.

Objective:To investigate and analyze the radioactivity levels of 90Sr and 137Cs in drinking water and 137Cs in food after the installation of the first AP1000 nuclear power unit in China. Methods:From 2012 to 2019, four drinking water monitoring points around AP1000 nuclear power unit located at Sanmen nuclear power plant site were collected during the wet season and dry season, 90Sr and 137Cs and radioactivity concentrations were determined in drinking water. Local rice, cabbage, crucian and mullet were collected to determine the radioactivity concentration of 137Cs. Results:From 2012 to 2019, the radioactivity concentrations of 90Sr and 137Cs in drinking water were 1.2-9.8 mBq/L and 0.2-8.1 mBq/L, respectively. The radioactivity concentration of 137Cs in food were 1.1×10 -2-2.8×10 -1 Bq/kg, lower than the limits specified in the Limited concentrations of radioactive materials in foods (GB 14882-94). Conclusions:After the installation of the first AP1000 nuclear power unit in China, the radioactivity levels of 90Sr and 137Cs in drinking water and 137Cs in foods are stable, without environmental impact identified.

Objective:To investigate and analyze the level of the gross radioactivity, and its variation trend, in surrounding drinking water since the second phase expansion project at Qinshan Nuclear Power Plant was officially put into operation.Methods:From 2010 to 2022, the source water, factory water and tap water within 30 km of Qinshan Nuclear Power Plant were collected in the flood season (May) and dry period (October) every year. The total α and total β radioactivity concentrations in drinking water was measured and analyzed. The levels of total radioactivity in drinking water around different nuclear power plants in China and around non-nuclear power plant areas was compared.Results:The mean radioactivity concentrations of total α and total β were (0.021±0.019) and (0.204±0.058) Bq/L in source water, (0.010±0.005) and (0.185±0.056) Bq/L in factory water , and (0.012±0.007) and (0.170±0.058) Bq/L in tap water, respectively, all lower than the limits stipulated in the Sanitary Standards for Drinking Water. There were no significant differences in the monitoring result of betweem the three types of water samples both in the flood and dry periods ( P> 0.05). The total radioactivity level in drinking water around Qinshan Nuclear Power Plant site was close to that in drinking water around different nuclear power plants in China and around areas without nuclear power plants. Conclusions:Following the second phase of the expansion project officially being put into operation, the total α and β radioactivity level in drinking water around the Qinshan Nuclear Power Plant has been in a stable trend and lower than the guidance level given in national standard.

Objective To investigate the operation status and service level of radiation occupational health inspection institutions in Zhejiang Province, China, and to provide a basis for administrative departments and quality management departments to develop policies. Methods The investigation data of radiation occupational health inspection institutions in Zhejiang Province were collected for descriptive analysis of the regional distribution, nature, and service qualification of the institutions. Results There were 27 radiation occupational health inspection institutions in Zhejiang Province. These institutions were located in 11 cities, of which 85.18% were public institutions and 14.72% were private institutions. For the physical examination workload of radiation workers in Zhejiang Province in 2021, general hospitals accounted for 75.90%, private institutions accounted for 4.51%, and occupational prevention and treatment hospitals accounted for 19.59%. In the radiation occupational health inspection institutions, the stand-alone and online software installation rates were 33.33% and 37.04%, respectively. A total of 26 986 individuals (82.97%) underwent chromosome aberration examination. The examination rates of thyroid color Doppler ultrasound examination and eye lens examination were 41.24% and 82.97%, respectively. Pre-job, on-job, and off-job physical examination accounted for 25.81%, 70.52%, and 3.67%, respectively. For radiation workers who underwent on-job physical examination, diagnostic radiology workers accounted for the highest proportion of 34.90%. The excellent, qualified, and unqualified rates of 27 radiation occupational health inspection institutions were 7.41%, 88.89%, and 3.70%, respectively. Conclusion The network of radiation occupational health inspection institutions in Zhejiang Province is well-established and located mainly in general hospitals, occupational prevention and control institutions, and private institutions. To enhance the quality and proficiency of occupational health examinations, it is imperative to prioritize self-improvement and management, reinforce law enforcement supervision, actively engage in blind sample assessments, and advance the application of information technology and standardized services.