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有人把乳状液误认为是真溶液,实际上乳状液是不均匀混合物。它的两相形成及其各相的组分与温度、溶质的种类、浓度、溶液的pH值、所用乳化剂种类及时间有关。这就导致了样品分相后,放射性物质、闪烁剂、溶剂在各相中分布的不稳定性。受这一不稳定性的影响,样品相分离后的计数之重复性和精确性均差,尤其在两个相的猝灭水平有较大不同时。在乳化系统中,无论何种猝灭监测技术都不能确定其计数效率。这是因为在乳状液和凝胶中,水相与有机相之间放射性物质的分配不同。此外,必须强调,外标准猝灭监测技术测量的仅仅是溶液的计数效率。由于γ辐射与具有不同电子密度的两个相的作用
Some people mistakenly believe that the emulsion is a real solution, in fact, the emulsion is a heterogeneous mixture. Its two-phase formation and the composition of its phases are related to the temperature, the type of solute, the concentration, the pH of the solution, the type of emulsifier used and the time involved. This results in the instability of the distribution of radioactive material, scintillator, and solvent in each phase after phase separation. Due to this instability, the repeatability and accuracy of the sample after phase separation are poor, especially when there is a large difference in quenching levels between the two phases. In emulsification systems, no matter what quench monitoring technique can determine its counting efficiency. This is because the distribution of radioactive material between the aqueous phase and the organic phase is different in emulsions and gels. In addition, it must be emphasized that external standard quenching techniques measure only the counting efficiency of the solution. Due to the effect of gamma radiation on two phases with different electron densities