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Preliminary studies on the spatial distribution of artificial 137Cs and natural gamma radionuclides in the region of the Ojców National Park, Poland

Stobiński M., Jędrzejek F., Kubica B.

Nukleonika

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2018

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Vol. 63, No. 4

105--111

EN

The aim of the research is to obtain preliminary information about the spatial distribution of gamma radionuclides in the soils taken from the Ojców National Park with emphasis on the behaviour of artificial radionuclides, with 137Cs as a representative. The natural radionuclides 40K, 226Ra (uranium series), and 228Th (thorium series), which are considered as background radiation, were also determined. In total, 18 soil samples were collected during the summer periods in 2015–2017, while the sampling points were selected with respect to differences in rainfall and local topography gradient. The method was based on gamma-ray spectrometry performed on high-purity germanium (HPGe) gamma detector (relative efficiency 34%). 137Cs was mostly deposited in the top soil layers, with activity in the range of 27.9÷586.6 Bq•kg–1. We found strong positive correlation of the 137Cs activity with the soil organic matter content, and at the same time, its dependence on the rainfall amount. Consequently, the soil types and local climate can control the spatial distribution of 137Cs on a small spatial scale. The quantity of natural radionuclides was highly similar in all samples with the following mean values: 38.0 Bq•kg–1 for 228Th, 33.1 Bq•kg–1 for 226Ra, and 479.9 Bq•kg–1 for 40K.

2

Self-absorption correction and efficiency calibration for radioactivity measurement of environmental samples by gamma-ray spectrometry

Misiak R., Hajduk R., Stobiński M., Bartyzel M., Szarłowicz K., Kubica B.

Nukleonika

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2011

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Vol. 56, No. 1

23-28

EN

In this work empirical functions which relate the full-energy peak efficiency with sample height, energy, matrix composition and bulk density for voluminal samples in a cylindrical counting geometry were found. Accurate determination of the radioactivity of gamma-emitting radionuclides in environmental samples requires taking into account self-absorption. For the obtained self-absorption correction factor, a direct transmission method was chosen. Finally, this paper proposes a simple correlation between the self-absorption correction factor and the bulk density and height of the measured sample for a given energy.

3

Radionuclides 137Cs and 40K in the soils of the Tatra National Park (TPN, Poland)

Kubica B., Skiba S., Drewnik M., Stobiński M., Kubica M., Gołaś J., Misiak R.

Nukleonika

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2010

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Vol. 55, No. 3

377-386

EN

The paper presents the results of radioactivity determination of artificial 137Cs and natural 40K in soil samples taken from the Tatra Mountains in Poland (Tatra National Park – TPN). Soil samples were collected as the cores of 10 cm in diameter and 10 cm in depth. These cores were divided into 3 slices. It has been found that the content of 137Cs was the highest at the sites of the altitude over 1300 m a.s.l. The values of 137Cs concentration in the soils examined varied – from 55.8 Bqźkg–1 (dry mass) (417.8 Bqźm–2) for the Tomanowa Pass (1685 m a.s.l.) to 5111 Bqźkg–1 (dry mass) (8400 Bqźm–2) for the Krzyzne Pass (2112 m a.s.l.). In most cases, the values were lower than the average radiocaesium concentration established for Poland.

4

Nowe polipropylenowe pompy membranowe zasilane sprężonym powietrzem

Stobiński M.

Pompy, Pompownie

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2005

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nr 4 (119)

66-67