Showing papers on "Environmental isotopes published in 1984"
TL;DR: In this paper, the heavy stable oxygen isotope, 18O, circulates in tandem with deuterium in the hydrologic cycle and shows pronounced seasonal variability and also the effects of altitude, latitude, distance from the sea, amount of precipitation, history of evaporation and long-period climatic cycles.
44 citations
39 citations
TL;DR: In this paper, the authors used the concentrations of the environmental isotopes 3 H, 18 O, 2 H and 14 C in the lake water and in the recharging groundwater to establish the lake-water balance.
34 citations
01 Jan 1984
14 citations
TL;DR: A series of leaching experiments with H 2 0, HCl, H N 0 3 and HF were carried out on pitchblende samples from Canada, Africa and China, a sample of uranotemnite from China and a sample from carnotite from Colorado, U. S. A as mentioned in this paper.
Abstract: A series of leaching experiments with H 2 0 , HCl, H N 0 3 and HF were carried out on pitchblende samples from Canada, Africa and China, a sample of uranotemnite from China and a sample of carnotite from Colorado, U. S. A. Marked enhancements of the 2 3 4 U/ 2 3 8 U ratio over the radioactive equilibrium value of 1.00 (Ci/Ci) were observed in some of the uranium fractions obtained from these radioactive minerals. (For example, a value of 23.8 ± 3.8 (Ci/Ci) was obtained for the J 3 4 U / 2 3 8 U ratio in a leaching fraction of carnotite.) However, the 2 3 5 U / 2 3 8 U ratios were found to remain close to the normal value of 0.046 (Ci/Ci) within the experimental uncertainties.
12 citations
01 Jan 1984
5 citations
TL;DR: The isotopic compositions of deuterium, oxygen 18, tritium and nitrogen 15 were determined for some groundwater samples from Wadi El-Natrun area as mentioned in this paper, and the distribution pattern of the environmental isotopes could be explained by the differences in the degree of mixing between three major sources of recharge to the Wadi el-natrun aquifer: River Nile water, paleowater and drainage water from Nubarya reclamation project.
Abstract: The isotopic compositions of deuterium, oxygen‐18, tritium and nitrogen‐15 were determined for some groundwater samples from Wadi El‐Natrun area. The distribution pattern of the environmental isotopes could be explained by the differences in the degree of mixing between three major sources of recharge to the Wadi El‐Natrun aquifer: River Nile water, paleowater and drainage water from Nubarya reclamation project. The analysis of 15N‐nitrate indicates a mixing process
2 citations
01 Jan 1984
1 citations