The weathering of rocks and soil causes uranium to collect in groundwater. In this article, we attempted assess the activity concentrations 234U/238U isotopic ratios various groundwater samples plants obtained from Ha’il region, Saudi Arabia. results showed that 238U ranged between 0.08 ± 0.04 1.11 0.06 Bq L−1, with an average 0.67 0.05 L−1. Activity 234U 0.12 0.01 2.2 0.8 1.26 0.11 internation...

The uranium isotopic composition (?238U) of bulk marine calcium carbonates has been extensively explored as a promising paleoredox proxy to track the extent global oceanic anoxia in deep time. Multiple studies have examined whether primary can directly capture seawater ?238U and measurements recent ancient preserve U isotope signatures. Here we assess role diagenesis altering signatures sedimen...

In the frame of a long-term research program on characterization large radioactive waste packages by photofission, Nuclear Measurement Laboratory CEA IRESNE, France, has measured cumulative photofission yields 235U and 238U short-lived long-lived fission products using Bremsstrahlung photon beam produced 16 MeV electron linear accelerator (LINAC). To this aim, been carried out activation analys...

The isotopic (234U/238U, 2H, 18O) and chemical composition of groundwater on the right bank Volga River along middle reach (European Russia) was studied down to a depth 400 m. These data allow diagnosis presence three-component mixture. first component is modern/young fresh recharge water Holocene age. It has δ18O → −12.9 ‰ δ2H −90 ‰, close modern precipitations, equilibrium uranium 234U/238U 1...

Radon is a natural radioactive gas produced by the decay of uranium and thorium, which are present in all rocks and soils in small quantities. There are several isotopes of radon, the most important of which are 222Rn (produced from 238U) and 220Rn (produced from thorium). 220Rn is also known as thoron because of its parent radionuclide. In the United Kingdom, it has been shown that 220Rn deliv...

The radiological quality of drinking water is directly associated with the health population. Indeed, it well known that presence radionuclides in constitutes a risk for humans because consumption such increases likelihood incurring cancer. For this reason, all studies aimed at developing new methodologies qualitative and quantitative analysis radioisotopic composition are absolutely desired by...

The recent article written by Moran et al. (2003) (herein referred to as M2003) poses the question whether thorium234 (234Th) provides an accurate record of particulate organic carbon (POC) export from the upper ocean. Although there is little argument that 234Th : 238U disequilibrium can be attributed to particle flux, we agree that there are still many unknowns regarding the factors that cont...