radionuclides of the thorium and uranium decay series and non radioactive contaminants which could have an impact on the environment. The uranium and thorium decay series are shown on Fig. 1 and 2 in Appendix I. There is concern related to the possible In this method, uranium, thorium, and plutonium isotopes in urine were subjected to analysis, whereas, radionuclides, such as 90Sr and 99Tc, with high water solubility and low concentrations were excluded. In this research, we aimed at determiningsuch as9099

A review of the behaviour of U

1.2. The environmental chemistry and behaviour of radionuclides in the U-238 decay chain 1.2.1. Uranium and thorium. Uranium and thorium are members of the actinide series of elements. Both elements can occur in nature in the tetravalent oxidation state and

Examples include uranium-235, uranium-238, thorium-232, and potassium-40. Primordial radionuclides end up in soil as part of the rock cycle, which includes weathering. Tree or plant roots dig down into cracks in the earth, prying the rock apart and turning it into soil.

At present radionuclides of uranium and thorium decay series are concentrated mostly in flood lands and relief depressions. At the same time, decrease in the radionuclide activity concentration in 0-20 cm soil layer is observed with changes in lateral distribution.

Uranium (4% of the total concentration) was partly soluble under weakly acidic conditions, whereas thorium was tightly bound in mineral phases. At the former Paukkajanvaara uranium mine in Eno, the aim of the study was to examine the potential for further mobilization of radionuclides after remediation of the site in early 1990s.

2002/5/1Naturally occurring radionuclides in materials derived from urban water treatment plants in southeast Queensland, Australia. Anion exchange method for the sequential determination of uranium, thorium and lead-210 in coal and coal ash. Journal of 1981, 62

Biological pathways of exposure and ecotoxicity values

Specifically, chemical and radiation hazards associated with radionuclides in the uranium decay series including uranium, thallium, thorium, bismuth, radium, radon, protactinium, polonium, actinium, and francium were the focus of the literature compilation.

1997/3/15A new approach to α spectrometric determination of the radioisotopes of uranium and thorium was developed for environmental samples based on 238 U and 232 Th as internal standards.238 U and 232 Th were accurately determined in the sample by simultaneous instrumental neutron activation analysis.

Surface soil samples from coastal region of Visakhapatnam were analyzed for uranium series and thorium series radionuclides by high-resolution gamma-ray spectrometry. Isotopic ratios of 226 Ra/ 238 U and 224 Ra/ 232 Th were calculated to investigate the radioactive equilibrium status in the samples.

There are several thousand nuclear installations across Europe and the world, as well as companies that use nuclear products.This everyday use carries a rare but very real risk of contamination for their staff. Cevidra, a new first-line treatment for skin contamination from radionuclides such as uranium, plutonium, thorium, americium, cobalt, cesium, strontium, zirconium, silver, antimony

Uranium has two radioactive isotopes, uranium-234 and uranium-238 that have potential adverse health effects on humans exposed to elevated levels of uranium for an extended period of time. The toxicity of uranium is due to the alpha radiation associated with the decay of the uranium nucleus.

A statewide compilation of radioactivity data (including uranium and thorium) and an accompanying Radioactivity Map Fact Sheet were completed by Kim (OFR VG2002-1). The map is a compilation of areas where ground-based and airborne geophysical and geological surveys have indicated the presence of elevated naturally occurring radioactivity relative to surrounding areas.

Uranium occurs naturally in the Earth's crust and is present in much higher concentrations, along with thorium and rare-earth elements, in areas where monazite sand occurs [18]. Naturally occurring uranium contains three alpha emitting radionuclides: 238U, 235

Thorium is just one of many radioactive elements we measure. We analyze marine samples for both natural and artificial radionuclides. Examples of naturally occurring radionuclides include those isotopes produced in the decay chains of the long-lived uranium and thorium isotopes (such as thorium-234, lead-210, radium-226), and cosmogenically produced radionuclides such as beryllium

Radiometric Map of Australia provides new insights into

Uranium and thorium abundances are derived indirectly by measuring gamma-ray emissions associated with the daughter radionuclides bismuth (214Bi) and thallium (208Tl), respectively. Uranium is the least abundant of the three radioelements in the Earth's

Surface soil samples from coastal region of Visakhapatnam were analyzed for uranium series and thorium series radionuclides by high-resolution gamma-ray spectrometry. Isotopic ratios of 226 Ra/ 238 U and 224 Ra/ 232 Th were calculated to investigate the radioactive equilibrium status in the samples.

M. M. Isam Salih, H. B. L. Pettersson, E. Lund, Uranium and Thorium Series Radionuclides in Drinking Water from Drilled Bedrock Wells: Correlation to Geology and Bedrock Radioactivity and Dose Estimation, Radiation Protection Dosimetry, Volume 102

Specifically, chemical and radiation hazards associated with radionuclides in the uranium decay series including uranium, thallium, thorium, bismuth, radium, radon, protactinium, polonium, actinium, and francium were the focus of the literature compilation.

radionuclides in Sweden, and to obtain ranges of concentrations and calculated radionu-clide fluxes with emphasis on uranium, thorium and potassium in the overburden, bed-rock and groundwater. In addition, data of Ra-226 and Rn-222 in groundwater are given.

Abstract: Uranium and thorium are stable (non-fissile) radionuclides found in numerous environmental matrices, such as seawater and freshwaters. Uranium is present as in the form uranyl ion (UO22+) whereas thorium is in the form Th(IV). Detection of these

natural uranium and thorium from place to place (including use as backfill) and still be exempt from the requirements of 10 CFR Part 40. As a result, this exemption could result in exposures above the unrestricted use criterion in 10 CFR 20.1402 for any high 3.2

uranium mill tailings include the emanation of radon gas, the transport of particles by wind and water, and the transport of soluble radionuclides, seeping from dis posal areas, by ground water. Due to the 77,000 year half-life of thorium-230, the parent of

1997/3/15A new approach to α spectrometric determination of the radioisotopes of uranium and thorium was developed for environmental samples based on 238 U and 232 Th as internal standards.238 U and 232 Th were accurately determined in the sample by simultaneous instrumental neutron activation analysis.