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对分析海水中Ra同位素的小体积(约10~20 L)alpha能谱法和大体积(200~500 L)Gamma能谱法进行了对比研究。取样水域含盖了零盐度河流(徐六泾)、近岸水体和开阔大洋,结果表明:不论在低盐度的近岸水体,还是在高盐度的外海水两种方法的结果在误差范围内可以认为是基本一致的。另外,在大体积Gamma能谱法研究中,发现富集海水所用的纤维量和过滤海水体积等因素的变化对于该方法富集效率和结果产生了影响;同时,验证了大体积方法本身的富集有效性。
A comparative study on small volume (about 10-20 L) alpha spectrometry and large volume (200-500 L) Gamma spectroscopy for the analysis of Ra isotopes in seawater was carried out. The sampled waters covered the zero-salinity rivers (Xu-liujing), nearshore bodies and open oceans. The results show that the results of two methods, whether in low-salinity nearshore bodies or in high-salinity outcrops, The range can be considered basically the same. In addition, in the study of large-volume Gamma spectroscopy, it was found that the change of factors such as the amount of fiber used to enrich seawater and the volume of seawater to be filtered affected the enrichment efficiency and result of this method. Meanwhile, Set validity.