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目的在大气放射性核素监测中引入空气实时监测系统,建立空气实时监测方法。方法以FHT59N2空气实时监测系统为代表,研究其能量刻度和效率刻度方法,建立能量刻度曲线和效率刻度曲线,分析该系统的运行模式特点,根据连续监测本底数据计算天然放射性核素的活度浓度和特定信号核素的检出限。结果汇总了1 d中40K、208Tl、212Pb、214Bi、214Pb等天然放射性核素每5 min的分析结果和1个月中这些核素每天监测结果均值并作图。确定131I、134Cs、137Cs等特定信号核素的检出限分别为5 mBq/m3、6 mBq/m3和6 mBq/m3。结论空气实时监测系统可以较好的应用于大气放射性核素监测。
Objective To introduce air real-time monitoring system into atmospheric radionuclide monitoring and establish a real-time air monitoring method. Methods The real-time FHT59N2 air monitoring system was used to study the energy calibration and efficiency calibration methods. The energy calibration curve and efficiency calibration curve were established. The characteristics of the system were analyzed. The activity of natural radionuclides was calculated based on the continuous monitoring background data Concentration and specific signal nuclide detection limits. Results The results of 5-minute analysis of natural radionuclides such as 40K, 208Tl, 212Pb, 214Bi and 214Pb every 5 minutes and the daily monitoring results of these radionuclides in one month were summarized and plotted. The detection limits of specific signal nuclides such as 131I, 134Cs and 137Cs were determined as 5 mBq / m3, 6 mBq / m3 and 6 mBq / m3, respectively. Conclusion The air real-time monitoring system can be better applied to atmospheric radionuclide monitoring.