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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Seasonal variations in the abundance and sinking flux of biogenic silica in Daya Bay, Northern South China Sea

100%
Zhao X., Yang W., Ma H., Li J., Chen M., Fang Z., Zhang X., Zeng J., Qiu Y., Zheng M.
Oceanologia
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2019
|
tom 61
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nr 2
2

Natural radioactivity of soil and sediment samples collected from postindustrial area

84%
Sleziak M., Petryka L., Zych M.
Polish Journal of Environmental Studies
|
2010
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tom 19
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nr 5
Contents of a typical postindustrial pond that was used 12 years previously as a tank for collecting waste water pumped from a coal mine was evaluated on the basis of 19 samples collected from the pond and surrounding area. Measurements of radium, thorium, and potassium, plus cesium activity, were performed with the use of a germanium detector – HPGe 4020 by examining photons with energy in the range 0.5 MeV to 3 MeV. In consequence, the concentrations of such radioisotopes as 226Ra, 232Th, 40K and, 137Cs were determined by their decay products, but the radiation effect of natural radioisotopes was estimated by I1 and I2 coefficients. The investigation shows the most contaminated residue in the sediments at the bottom of the settling tank.
3

On the cccurence of uranium and thorium in the biosphere of natural waters. Part II. Uranium and thorium in corals, molluscs and fish

84%
Szefer P., Ostrowski S.
Oceanologia
|
1981
|
tom 13
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Factors affecting background gamma radiation in an urban space

84%
Nowak K. J., Solecki A. T.
Journal of Elementology
|
2015
|
tom 20
|
nr 3
Terrestrial background gamma radiation in urban surroundings depends not only on the content of radionuclides in the soil and bedrock, but also on levels of radionuclides in building materials used for the construction of roads, pavements and buildings. The aim of this study was to characterize an outdoor absorbed dose rate in air in the city of Wroclaw and to indicate factors that affect the background gamma radiation in an urban space. Gamma spectrometric measurements of the radionuclide content and absorbed dose rate in air were performed by means of portable RS-230 gamma spectrometers and at sites with various density of buildings, in the city center and in more distant districts, over pavements and roads as well as in a park, a cemetery and on four bridges. Measurements were performed at a 1-meter height. The absorbed dose rate in air ranged from 19 to 145 nGy h-1, with the mean of 73 nGy h-1. This paper implicates that terrestrial background gamma radiation depends on the type of building material used for the construction of roads and pavements and on the density of buildings shaping the geometry of the radiation source. The highest background gamma radiation was observed in the center of the city, where buildings are situated close to each other (nearly enclosed geometry) and pavements are made of granite. The lowest background gamma radiation was noticed on bridges with nearly open field geometry. Additionally, three profiles at the heights of 0.0, 0.5 and 1.0 m were arranged between two opposite walls of the hall of the Main Railway Station in Wroclaw, where the floor is made of various stone slabs. The results indicated that the absorbed dose rate in air varied, depending on the type of building material, but became averaged along with the height.
5

On the occurence of uranium and thorium in the biosphere of natural waters. Part I. Uranium and thorium in plankton and inherent plants

84%
Szefer P., Ostrowski S.
Oceanologia
|
1981
|
tom 13
6

Content of 27 selected elements in the potentially mobile fraction of tsunami sediments

51%
Kozak L., Machat J., Niedzielski P.
Polish Journal of Environmental Studies
|
2009
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tom 18
|
nr 1
131-136
Our paper reports results of a study on the bioavailability of selected elements from sediments deposited by the tsunami event of 26 December 2004 in south Thailand. In January 2005, 15 samples of the sediments deposited by the tsunami were collected at four different localities. The reference sample was collected in an area not affected by the tsunami. In the acid leachable sediments fraction (the bioavailable fraction) the contents of 27 selected elements (Be, Ga, Bi, Rb, Cs, Sn, Mn, Re, Co, Rh, Ru, Mo, V, Nb, Ta, Zr, Sc, Th, Pt, La, Ce, Nd, Eu, Gd, Tb, Ho, Lu) were determined using ICP-MS. The measurements were repeated after one year to establish a potential effect of the rainy season on the content of these elements in this fraction.
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