Uranium-thorium Series Isotopes In Ocean Profiles

2001 ◽  
pp. 3146-3156 ◽  
Author(s):  
S. Krishnaswami
Keyword(s):  
Thorium Series

scholarly journals Study and Characterization of Natural Radioactivity Levels and Radiological Hazards of Soil in Wasit Governorate

2021 ◽  
Vol 2114 (1) ◽  
pp. 012002
Author(s):  
Wisam Kareem H. Al-Rakabi ◽  
Hadi Dwaich Z. Al-Attabi
Keyword(s):  
Agricultural Land ◽  
Annual Effective Dose ◽  
Hazard Index ◽  
Absorbed Dose ◽  
Public Parks ◽  
Radiological Hazards ◽  
Radium Equivalent ◽  
Thorium Series ◽  
Radioactivity Levels

Abstract In this paper studied and measured the natural radioactive for agricultural soil samples surrounding Kut as well as gardens, home, casinos and others. Eighteen samples of agricultural land were taken on three deep depths the first depth 10 cm and the second 20 cm and the third 30 cm. Twenty-five samples were taken from public parks, parks, casinos and other parks. They are all measured using a system NaI (Tl) 3″ × 3″. The results that the radioactive effectiveness of uranium for all samples are ranged 17.19 to 38.68 Bq/Kg and at a rate of 30.55 Bq/Kg for all samples. Thorium series values were between 56.45 to 13.26 Bq/Kg with average 38.60 Bq/Kg. With regard to potassium, values were ranged 537.20 to 118.30 Bq/Kg at a rate of 250.25 Bq/Kg. The values of radioactive effectiveness for potassium are within the globally allowed compared with the radioactive effectiveness of the Thorium. The radium equivalent and the rate absorbed dose in air and the external and internal hazard index and the annual effective dose has been calculated and that all values are within the globally allowed limits.

Uranium and thorium series disequilibria in recent and fossil marine molluscan shells

1967 ◽  
Vol 72 (18) ◽  
pp. 4745-4757 ◽  
Author(s):  
R. L. Blanchard ◽  
M. H. Cheng ◽  
H. A. Potratz
Keyword(s):  
Thorium Series

scholarly journals Beryllium and helium. I.—The helium contained in beryls of varied geological age

1933 ◽  
Vol 142 (847) ◽  
pp. 370-381 ◽  
Keyword(s):  
The Other ◽  
Helium Content ◽  
Other Hand ◽  
Geological Age ◽  
The Subject ◽  
Thorium Series

Many years ago I found that the mineral beryl (composition Al 2 Be 3 (SiO 3 ) 6 ) contains much more helium than can be accounted for by the small traces of radioactive matter of the uranium and thorium series present in it. The same ground has been partly gone over again by other workers but it cannot be said that their papers contain any further advance towards determining definitely the origin of the helium found. Recently, on reconsidering the subject, it appeared that there was one outstanding point at least which was reasonably accessible to investigation, namely the relation of helium content to the geological age of the specimen. If helium has accumulated in the mineral as the result of atomic disintegration continued through long geological periods, we should expect large helium content to be found only in beryls coming from ancient formations. If, on the other hand, it had been trapped in some way when the mineral was formed, or if its presence were due to the rapid disintegration of a comparatively short-lived parent such as radium or ionium originally present in the mineral, we should expect to find more helium in the beryls of younger formations, since the opportunities for its escape have been less.

scholarly journals Radioactive disequilibrium of thorium series nuclides in hot spring deposits.

1975 ◽  
Vol 9 (4) ◽  
pp. 221-226 ◽  
Author(s):  
Takashi Okubo ◽  
Masanobu Sakanoue
Keyword(s):  
Hot Spring ◽  
Radioactive Disequilibrium ◽  
Thorium Series

scholarly journals Distribution of Natural Radioactivity,137Cs,90Sr, and Plutonium Isotopes in a Water Column and Sediment Core along the Algerian Coast

2007 ◽  
Vol 2007 ◽  
pp. 1-6 ◽  
Author(s):  
A. Noureddine ◽  
M. Benkrid ◽  
R. Maoui ◽  
M. Menacer ◽  
R. Boudjenoun
Keyword(s):  
Water Column ◽  
Sediment Core ◽  
Sediment Cores ◽  
Dry Weight ◽  
Artificial Radioactivity ◽  
Energy Agency ◽  
Area Of Interest ◽  
Algerian Coast ◽  
Seawater Samples ◽  
Thorium Series

Concentrations of natural (40K,210Pb, uranium, and thorium series) and artificial radioelements (137Cs,90Sr,239+240Pu) were determined in seawater and sediment samples collected from stations along the Algerian coast. Seawater was collected from the surface to a maximum depth of 2000 m; the sediment cores were sampled from a depth of around 1500 m. This work was carried out in August 2001, in the framework of the Regional African project /7/004 (RAF), by the accomplishment of an oceanographic campaign organized by the International Atomic Energy Agency (IAEA) in collaboration with Commissariat à l'Energie Atomique (COMENA) and L'Institut des Sciences de la Mer et de L'Amenagement du Littoral (ISMAL), on board of the research vessel of M.S. Benyahia of ISMAL. In addition to the record of the conductivity (mS) and temperature (°C) data at each station, seawater samples were treated and preconcentrated on board, those of sediment cores were divided into different layers in order to undergo analyses in the laboratory of radiological impact studies of Algiers. Concentration results were obtained for137Cs and90Sr in mBq/L and239+240Pu inμBq/L in seawater, and also for natural and artificial radionuclides in Bq/kg dry weight in the layers of the sediment cores. The different profiles of137Cs,239+240Pu,90Sr, and210Pb concentrations against depth were presented to show artificial radioactivity distribution in the water column and sediment core. Concentrations of137Cs in the sediment core were also used to identify the137Cs peak in the area of interest.

Fluxes of uranium and thorium series isotopes in the Santa Barbara Basin

1981 ◽  
Vol 53 (3) ◽  
pp. 391-399 ◽  
Author(s):  
Willard S. Moore ◽  
Kenneth W. Bruland ◽  
Jacqueline Michel
Keyword(s):  
Santa Barbara ◽  
Santa Barbara Basin ◽  
Thorium Series
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