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目的基于铅离子对CTMAB-8-羟基喹啉-5-磺酸体系的荧光增强效应,建立氡辐射累积计量的荧光光谱测定新方法。方法氡辐射透过滤膜进入吸收液,衰变形成的子体铅与吸收液反应形成Pb~(2+)。在氯化铵-氨水介质中,溴化十六烷基三甲基胺的存在下,Pb~(2+)与8-羟基喹啉-5-磺酸配合,体系荧光强度增加,并与铅离子浓度呈现良好的线性关系,据此建立基于铅的氡检测新方法。结果当Pb~(2+)浓度为23.33 ng/ml~150 ng/ml时,ΔF与ρ之间呈现良好的线性关系,其回归方程为ΔF=0.29ρ+3.99,相关系数(r)为0.995 8,检出限为7.0 ng/ml。ΔF与对应的低剂量氡辐射强度之间呈现良好的线性关系,线性方程为ΔF=0.24D+4.70,r=0.992 1。结论该法对铅的检出限低,可分别用于铅和低浓度氡的检测。氡辐射α粒子、β粒子后形成稳定的子体铅,新建的氡采样方法简便。
OBJECTIVE To establish a new fluorescence spectrometry method for the cumulative measurement of radon radiation based on the fluorescence enhancement effect of lead ions on CTMAB-8-hydroxyquinoline-5-sulfonic acid system. Methods Radon radiation enters into the absorption liquid through the filter membrane, and the daughter body formed by decay reacts with the absorption liquid to form Pb 2+. Pb 2+ and 8-hydroxyquinoline-5-sulfonic acid in the presence of cetyltrimethyl ammonium bromide in ammonium chloride-ammonia aqueous solution, the fluorescence intensity of the system increased, and with lead Ion concentration shows a good linear relationship, thus establishing a new lead-based radon detection method. Results When the concentration of Pb 2+ was 23.33 ng / ml ~ 150 ng / ml, there was a good linear relationship between ΔF and ρ, the regression equation was ΔF = 0.29ρ + 3.99 and the correlation coefficient (r) was 0.995 8, the detection limit of 7.0 ng / ml. There was a good linear relationship between ΔF and the corresponding low dose radon radiation intensity. The linear equation was ΔF = 0.24D + 4.70 and r = 0.992 1. Conclusion The method has low detection limit for lead and can be used for the detection of lead and low concentration of radon. Radon radiation α particles, β particles form a stable daughter of lead, the new method of sampling radon is simple.