ABSTRACT
Objective:To improve the analytical method of radionuclide 14C, and estimate the internal dose caused by 14C to human, in order to protect the health of workers and the public in workplaces involving potential 14C exposure. Methods:Urine samples were pretreated by wet oxidation. In the analysis, potassium persulfate was used as an oxidant to decompose urea into carbon dioxide, which was absorbed by 1 mol/L sodium hydroxide, and the absorption solution was converted into calcium carbonate precipitation. After calcium carbonate powder was prepared into sample source by suspension method, the low background liquid scintillation counter was applied to measure the radioactivity, which can be used for calculating the result.Results:The reaction time optimized by using carbamide as carrier was 1 h. For 80 ml urine, the amount of potassium persulfate used was 10 g. The method recovery rate reached about 100%. Four real urine samples were tested using the optimized method, and the result of activity concentration 14C was 0.32, 0.60, 0.86 and 0.74 Bq/L, respectively. Conclusions:The optimized method had good stability, high accuracy and stable experimental result, which could meet the needs of routine radiological detection. The establishment of a quantitative method for 14C in urine sample has improved the methodological system for 14C monitoring.
ABSTRACT
Objective:To investigate the soldiers' depression after sea field training and influence factors.Methods:1107 navy men were evaluated by Zung's Self-Rating Depression Scale (SDS) and Eysenck personality questionnaire (EPQ) after field training.Results: The rate of depression in the study group was 25.04%, N score of the soldiers after sea field training was significantly higher than the norm of Chinese army men. Logistic regression analysis revealed that the factors of nervousness, dyscoimesis, medical history during sea field training, restless, introversion, the level of education, living environment before joining in the army, hunger and so on had influenced the level of depression.Conclusion:The total incidence of depression in soldiers after sea field training is higher than the norm of army men. It is associated with stress, personality characteristics, training factors, general malaise, psychological pressure and the level of education.
ABSTRACT
Objective To investigate the soldiers' mental health status and its influence factors after sea training. Methods A total of 1 107 military men were evaluated by using the symptom check list 90(SCL 90) and Eysenck personality questionnaire(EPQ) after sea training. Results In this study, except interpersonal sensitivity index, all factorial scores of the military man after training were higher than the norm of normal Chinese. The total scores and some factorial scores, such as obsession, interpersonal sensitivity, panic and paranoid were significantly lower than those of the norm of normal Chinese servicemen. In this group, 230 (20 78%) soldiers had the single factor score higher than 3. The mean factor score of SCL 90 of the solders coming from cities was higher than that of those from rural areas. Scores of the men who served for 1 year were higher than those for 2 years. Correlation analysis of the scores of SCL 90 and EPQ showed more emotional instability, introversion, and fierce emotional reaction resulted in higher score of SCL 90. Conclusion The mental health status of the military men investigated was good. Sea training had almost no influence on them. However, about 20% soldiers had mental health problems resulted from the factors such as higher level of education, coming from cities, short service time, and some personality characteristics.