Narayana Y, Radhakrishna A P, Somashekarappa H M, Karunakara N, Balakrishna K M, Siddappa K
Department of Studies in Physics, Mangalore University, Mangalagangotri, India.
Health Phys. 1995 Aug;69(2):178-86. doi: 10.1097/00004032-199508000-00002.
In order to understand the distribution of radionuclides in the newly discovered high background area in Ullal near Mangalore, soil and sand samples collected from different depths were analyzed for the concentration of primordial radionuclides by gamma spectrometry. The activity of 232Th and 238U in soil and sand was observed to be maximum in the 0-10 cm layer. The activity of primordial radionuclides was determined for the different size fractions of soil and sand to study the enrichment pattern. The highest activity was found in the 250-125 mu fraction in both soil and sand. The concentration of primordial radionuclides in riverine and marine sediments in the vicinity of the high background area was measured to understand the transportation of radionuclides in riverine and marine environments and to throw light on the formation of the new patches of monazite deposit. The results of these systematic investigations are discussed in this paper.
为了解芒格洛尔附近乌拉尔新发现的高本底地区放射性核素的分布情况，通过伽马能谱法对从不同深度采集的土壤和沙子样本进行了分析，以确定原生放射性核素的浓度。观察到土壤和沙子中232Th和238U的活度在0至10厘米层中最高。为研究富集模式，测定了土壤和沙子不同粒径部分的原生放射性核素活度。在土壤和沙子中，250至125微米粒径部分的活度最高。测量了高本底地区附近河流和海洋沉积物中原生放射性核素的浓度，以了解放射性核素在河流和海洋环境中的迁移情况，并阐明新独居石矿床斑块的形成。本文讨论了这些系统调查的结果。
