An Estimate of Thorium 234 Partition Coefficients Through Global Inverse Modeling

Alpha-recoil thorium-234: dissolution into water and the uranium-234/uranium-238 disequilibrium in nature.

The rate of ejection of alpha-recoil thorium-234 into solution from the surface of zircon sand gives an alpha-recoil range of 550 angstroms. The alpha-recoil thorium-234 atoms ejected into the groundwater may supply excess uranium-234. In pelagic sediments, ejected alpha-recoil thorium-234 may contribute to the supply of mobile uranium-234 in the sedimentary column.

An intercomparison of small- and large-volume techniques for thorium-234 in seawater

In this paper, an intercomparison of methods for the determination of Th in seawater is discussed. Samples were collected either from a shore-based 600 m water source, or from standard bottle casts in deep waters off Hawaii and the Southern Ocean. We compared large-volume techniques, which rely upon Mn cartridges for the collection of dissolved Th Ž . and its detection via gamma counting )200-l...

Estimate of Convection-Diffusion Coefficients from Modulated Perturbative Experiments as an Inverse Problem

An assessment of particulate organic carbon to thorium - 234 ratios in the ocean and their impact on the application of 234 Th as a POC flux proxy

Thorium-234 is increasingly used as a tracer of ocean particle flux, primarily as a means to estimate particulate organic carbon export from the surface ocean. This requires determination of both the Th activity distribution (in order to calculate Th fluxes) and an estimate of the C/ Th ratio on sinking particles, to empirically derive C fluxes. In reviewing C/ Th variability, results obtained ...

Using water–solvent systems to estimate in vivo blood–tissue partition coefficients

BACKGROUND Blood-tissue partition coefficients indicate how a chemical will distribute throughout the body and are an important part of any pharmacokinetic study. They can be used to assess potential toxicological effects from exposure to chemicals and the efficacy of potential novel drugs designed to target certain organs or the central nervous system. In vivo measurement of blood-tissue parti...