U-234 Specific Alpha-Activity

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.

Assessment of the Specific Activity of Alpha- and Beta-emitting Radionuclides in Groundwater, Anka, Nigeria

Introduction: After the lead poisoning outbreak came to light in Zamfara State, Nigeria, people living near gold mines were worried about environmental safety, especially drinking water quality. This study examined the gross alpha and gross beta activity concentrations in groundwater in different locations of Anka, Zamfara State, Nigeria, to measure the possible radiation dose and potential hea...

Control on ( 234 U / 238 U ) in lake water : A study in the Dry Valleys of Antarctica

The (U/ U) ratio in surface waters is generally higher than secular equilibrium due to nuclide recoil during alpha-decay of U. The size of the deviation from secular equilibrium contains information about the environment in which the water is found. This potential tool for environmental reconstruction has previously been studied in rivers, groundwater, and sediment pore-water. Here we conduct a...

UN CO RR EC TE D PR OO F Seawater ( 234 U / 238 U ) during the last 800 thousand years

Constraining the history of seawater (234U/238U) is important because this ratio is used to assess the validity of U/ Th ages, and because it provides information about the past rate of physical weathering on the continents. This study makes use of U-rich slope sediments from the Bahamas in an attempt to reconstruct seawater (234U/238U) for the last 800 kyr. For the last 360 kyr, U/Th dating of...

Excesses of seawater - derived 234 U in volcanic glasses from Loihi Seamount due to crustal contamination