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National comparison of methods for determination of radon in water

Mazur Jadwiga, Kozak Krzysztof, Grządziel Dominik, Guguła Szymon, Mroczek Mariusz, Kozłowska Beata, Walencik-Łata Agata, Podgórska Zuzanna, Wołoszczuk Katarzyna, Przylibski Tadeusz A., Kowalska Agata, Domin Elżbieta, Wysocka Małgorzata, Chałupnik Stanisław, Chmielewska Izabela, Długosz-Lisiecka Magdalena, Szajerski Piotr, Chau Nguyen Dinh, Krakowska Paulina, Pliszczyński Tomasz, Ośko Jakub, Dymecka Małgorzata, Mazurek Daria

Nukleonika

2020

Vol. 65, No. 2

77--81

The article describes three interlaboratory experiments concerning 222Rn determination in water samples. The first two experiments were carried out with the use of artificial radon waters prepared by the Laboratory of Radiometric Expertise (LER), Institute of Nuclear Physics, Polish Academy of Sciences in Kraków in 2014 and 2018. The third experiment was performed using natural environment waters collected in the vicinity of the former uranium mine in Kowary in 2016. Most of the institutions performing radon in water measurements in Poland were gathered in the Polish Radon Centre Network, and they participated in the experiments. The goal of these exercises was to evaluate different measurement techniques used routinely in Polish laboratories and the laboratories’ proficiency of radon in water measurements. In the experiment performed in 2018, the reference values of 222Rn concentration in water were calculated based on the method developed at LER. The participants’ results appeared to be worse for low radon concentration than for high radon concentrations. The conclusions drawn on that base indicated the weaknesses of the used methods and probably the sampling. The interlaboratory experiments, in term, can help to improve the participants’ skills and reliability of their results.

Detailed parametrization of the pore space in tight clastic rocks from Poland based on laboratory measurement results

Krakowska Paulina

Acta Geophysica

2019

Vol. 67, no. 6

1765--1776

Computed X-ray tomography (CT), together with nuclear magnetic resonance spectroscopy, pulse- and pressure-decay permeability methods, is a source of comprehensive information about the geometrical parameters of the pore space. Geological material consists of 31 samples of tight, gas-bearing, clastic rocks from different wells and formations. The purpose was to parametrize in detail the pore structure, revealing the relationships between the various parameters and estimating the equation for assessing the fluid flow ability of analyzed tight rocks. Following parameters were taken into consideration in the pore space characterization: thickness mean, equivalent diameter, anisotropy, elongation, sphericity, Feret diameter, Feret coefficient, Feret shape; shape factors: 2nd circularity coefficient, Malinowska coefficient and Danielsson coefficient; as well as parameters from 3D skeleton analysis: junctions, branches, coordination number. It was captured the dependence of logarithmic T2 mean from NMR on junction count from CT, as well as T2 cutoff from NMR on elongation from CT for the all samples. Logarithm of absolute permeability was estimated based on multiple linear regression analysis using only geometrical parameters from X-ray nanotomography, which is a benefit in the times of coring material decrease.