Wyniki wyszukiwania - BazTech

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Accumulation properties of Norway spruce (Picea abies) for different radionuclides

Tomankiewicz E., Mietelski J., Gaca P., Błażej S.

Nukleonika

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2006

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Vol. 51,suppl.2

59-67

EN

The paper presents results for the 137Cs, 90Sr, 40K activity concentrations and 228Th/232Th, 230Th/232Th activity ratios in several samples needles from two Norway spruce (Picea abies) trees and two soil samples collected in the Tatra Mountains (Poland) area. Activities for artificial 137Cs and 90Sr show moderate values. Statistically different values were found between the mean concentration of 90Sr and 137Cs in current (C) and two years old (C+2) needles of the first tree, whereas for potassium no significant difference was observed. For the second, fallen tree, no significant difference between the mean activity concentration in needles for C+1 and C+2 was found for each radionuclide, but much lower levels of 137Cs contamination were observed. Observed values of the aggregation coefficients for 137Cs and 90Sr are presented.

2

Cosmogenic 22Na and 7Be in ground level air

Grabowska S., Mietelski J.

Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa

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2004

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nr 1

81-82

3

High pure, carrier free 85Sr and 83Rb tracers obtained with AIC-144 cyclotron

Misiak R., Gaca P., Bartyzel M., Mietelski J.

Nukleonika

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2003

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Vol. 48, nr 3

151--153

EN

The method of obtaining carrier free tracers, 85Sr and 83Rb from proton-irradiated natRbCl target is described. The separation of the radionuclides was done using Sr-Resin, the resin based on a crown ether. Current and some other possible applications of the tracers are discussed.

4

Decreasing of the natural background counting - passive and active method

Kozak K., Mietelski J., Jasińska M., Gaca P.

Nukleonika

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2001

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Vol. 46, nr 4

165-169

EN

The methods of passive and active shielding and the results of background gamma measurements, during the years 1996-2000 are presented. The spectrometer background was recorded in various shielding configurations. The ultra-low level gamma-spectrometer (called in the paper the spectrometer E), equipped with a veto-detector for cosmic muons (active shield) was under tests during 1999-2000.