uranium thorium measurements

Estimating terrestrial uranium and thorium by antineutrino ...

Estimating terrestrial uranium and thorium by antineutrino flux measurements Stephen T. Dye*†‡ and Eugene H. Guillian§ *Department of Physics and Astronomy, University of Hawaii at Manoa, 2505 Correa Road, Honolulu, HI 96822; †College of Natural Sciences, Hawaii Pacific University, 45-045 Kamehameha Highway, Kaneohe, HI 96744; and §Department of Physics, Engineering Physics, and ...

(PDF) Determination of uranium and thorium concentration ...

PDF | On Nov 1, 2018, Felix B. Masok and others published Determination of uranium and thorium concentration and gross alpha and beta activity measurement in top soil samples from Richards Bay ...

Determination of thorium, uranium, and potassium elemental ...

Determination of thorium, uranium, and potassium elemental concentrations in surface soils in Cyprus Michalis Tzortzis and Haralabos Tsertos* Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus. (Revised version: 8/03/2004) Abstract A comprehensive study was conducted to determine thorium, uranium and potassium

(PDF) Distribution of uranium, thorium and potassium in ...

PDF | Uranium, thorium, potassium and their decay product mass flows were analysed in the Bayer process. Gamma-ray spectroscopy was used to measure the radionuclide content in …

Measurements to determine the radiological impact of ...

Measurements to determine the radiological impact of uranium and thorium in soils in the darling scarp. ... with a lesser contribution from the uranium decay chain ... The thorium concentration exceeded the world range reported by the United Nations Scientific Committee on the Effects of Atomic Radiation Report to the General Assembly. It was ...

MEASUREMENT OF URANIUM AND THORIUM …

measurement of neutrino oscillation parameters and investigation of uranium and thorium abundances in the earth using anti-neutrinos a dissertation submitted to the department of physics and the committee on graduate studies of stanford university in partial fulfillment of the requirements for the degree of doctor of philosophy kazumi tolich

Uranium–lead dating - Wikipedia

Uranium–lead dating, abbreviated U–Pb dating, is one of the oldest and most refined of the radiometric dating schemes. It can be used to date rocks that formed and crystallised from about 1 million years to over 4.5 billion years ago with routine precisions in the 0.1–1 percent range.

Uranium–thorium dating - Wikipedia

Uranium–thorium dating, also called thorium-230 dating, uranium-series disequilibrium dating or uranium-series dating, is a radiometric dating technique established in the 1960s which has been used since the 1970s to determine the age of calcium carbonate materials such as speleothem or coral.

Spectral Gamma Borehole Logging - usgs.gov

Spectral gamma borehole geophysical methods measure natural-gamma energy spectra, which are caused by the decay of uranium, thorium, potassium-40, and anthropogenic radioactive isotopes. Spectral gamma data can be used to identify and quantify the amount of uranium, thorium, and potassium-40 isotopes detected in boreholes.

Radioactive Elements in Coal and Fly Ash, USGS Factsheet ...

Most thorium in coal is contained in common phosphate minerals such as monazite or apatite. In contrast, uranium is found in both the mineral and organic fractions of coal. Some uranium may be added slowly over geologic time because organic matter can extract dissolved uranium …

Uranium and thorium isotopic and concentration ... - DeepDyve

May 01, 2002· Read "Uranium and thorium isotopic and concentration measurements by magnetic sector inductively coupled plasma mass spectrometry, Chemical Geology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at …

Uranium and thorium isotopic and concentration ...

Jun 12, 2002· Uranium and thorium isotopic and concentration measurements by magnetic sector inductively coupled plasma mass spectrometry. Chuan Chou Shen, Larry Edwards, Hai Cheng, Jeffrey A. Dorale, Rebecca B. Thomas, S. Bradley Moran, Sarah E. Weinstein, Henrietta N. Edmonds.

Determination of traces of uranium and thorium in ...

cooling time was 6 to 8 days for uranium and 15 to 19 days for thorium. Uranium was determined by measuring y-rays from 228 keV of 2"Np and tho-rium from 312 keV of "'Pa. 2.3 CD/MS The instrument used was a commercial GD/MS system (VG 9000, VG Isotopes). A pin-shaped 398

Isotopes of thorium - Wikipedia

Thorium-232. 232 Th is the only primordial nuclide of thorium and makes up effectively all of natural thorium, with other isotopes of thorium appearing only in trace amounts as relatively short-lived decay products of uranium and thorium.

DEVELOPING AN EFFICIENT METHOD FOR THE …

particle-emitting nuclides, particularly uranium and thorium. The Division of Radiochemistry performs isotopic measurements of uranium and thorium by radiochemical separations followed by alpha-particle spectrometry, or by gamma-ray spectrometry of their decay progeny. Our radiochemical analyses have been very sensitive but slow, while our ...

Concentration Measurements of Uranium, Thorium and Their ...

FreeBookSummary.com . Concentration measurings of U, Th and their merchandises in H2O produced from and near oil Fieldss in North of Iraq utilizing SSNTRD 's inactive methodAbstraction: In the present survey, the radiation concentrations of uranium 238U, Th 232Th and their merchandises in H2O samples collected from different oil Fieldss and beginnings in North of Iraq, were ...

USTUR 600: ALPHA SPECTROMETRY MEASUREMENT FOR ...

united states transuranium and uranium registries analytical procedure manual ustur 600: alpha spectrometry measurement for radionuclides . of americium, plutonium, uranium, and thorium

Concentration measurements of uranium, thorium and their daughter products in water produced from and near oil fields in north of Iraq using SSNTRD's passive method Ammir H. Ali • Ahmed K ...

Thick source alpha counting: the measurement of thorium

delayed neutron activation (DNA) measurements of uranium improves the TSAC estimate of thorium. In the standard usage of TSAC, the total combined count rate, for thorium with its daughters and uranium with it daughters, is recorded. In addition "slow pairs" record successive alpha decays of 220Rn and its daughter 216Po in the thorium decay ...

Uranium and thorium isotopic and concentration ...

May 01, 2002· We have developed techniques by sector-field inductively coupled plasma mass spectrometry (ICP-MS) for measuring the isotopic composition and concentration of uranium and thorium, focusing on the rare isotopes, 230 Th and 234 U. These isotopes have been widely used as tracers in earth sciences, e.g., chronology, paleoclimatology, archeology ...

Samples Containing Thorium or Uranium

Thorium-bearing minerals are widespread, but generally in small amounts. Monazite is the principal source of Th. Uranium is estimated to be present in the earth's crust at about 4 ppm and occurs combined with silicates, phosphates, and zirconates.

A Procedural Manual for Measurement of Uranium and …

A Procedural Manual for Measurement of Uranium and Thorium Isotopes Utilizing the USGS-Stanford Finnegan Mat 262 By Donald D. Shamp 1 Open-File Report 01-333 2001 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey

Uranium Measurements and Attributes - Digital Library

Uranium Measurements and Attributes Thomas B. Gosnell Lawrence Livermore National Laboratory Abstract It may be necessary to find the means to determine unclassified attributes of uranium in nuclear weapons or their components for future transparency initiatives. We briefly describe the

Thorium - Wikipedia

Uranium–thorium dating is commonly used to determine the age of calcium carbonate materials such as speleothem or coral, because uranium is more soluble in water than thorium and protactinium, which are selectively precipitated into ocean-floor sediments, where their ratios are measured. The scheme has a range of several hundred thousand years.

Measuring naturally occurring uranium in soil and minerals ...

These measurements can either be conducted in situ or by means of laboratory analyses of the samples. The most significant naturally occurring radionuclides are uranium, thorium and 40 K which are all of primordial origin (Macdonald et al., 1997).

MEASUREMENTS OF THE AEROSOL SIZE DISTRIBUTION …

Data on the size distribution of uranium and thorium bearing atmospheric aerosols were obtained and used to compute inhalation dose using several different models. During most of the year, the mass of 238U above 4.3 µm exceeded 80% of the total uranium mass from all particulates. During any sampling period the size distribution was bimodal ...

Uranium and thorium isotopic and concentration ...

Uranium and thorium isotopic and concentration measurements by magnetic sector inductively coupled plasma mass spectrometry Chuan-Chou Shena,*, R. Lawrence Edwardsb, Hai Chengb, Jeffrey A. Doralec, Rebecca B. Thomasb, S. Bradley Morand, Sarah E. Weinsteind, Henrietta N. Edmondse aDepartment of Earth Sciences, National Cheng Kung University, 1 TA Hsueh Road, Tainan, Taiwan …

Fertile-to-fissile and fission measurements for depleted ...

@article{osti_6721098, title = {Fertile-to-fissile and fission measurements for depleted uranium and thorium bombarded by 800-MeV protons}, author = {Gilmore, J.S. and Russell, G.J. and Robinson, H. and Prael, R.E.}, abstractNote = {Axial distributions of fissions and of fertile-to-fissile conversions in thick depleted uranium and thorium targets bombarded by 800-MeV protons have been measured.

Laser-induced breakdown spectroscopy measurements of ...

Jun 01, 2013· Laser-induced breakdown spectroscopy measurements of uranium and thorium powders and uranium ore Author links open overlay panel Elizabeth J. Judge a James E. Barefield II a John M. Berg b M. Clegg a George J. Havrilla a Velma M. Montoya a …

Separation and measurement of thorium, plutonium ...

A technique for the isolation of thorium (Th), plutonium (Pu), americium (Am), uranium (U) and strontium (Sr) isotopes from various environmental matrices has been adapted from a previously published method specific to water samples (Maxwell, 2006).Separation and isolation of the various elemental fractions from a single sub-sample is possible, thereby eliminating the need for multiple analyses.

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