The authors conducted studies on the release rate of 222Rn from groundwater flowing out of a spring, from metamorphic reservoir rocks. This source gives rise to a stream about 205 m long. The activity concentration of Rn in the spring was about 700 Bq/dm33, took place at a distance of about 1 70-180 metres from the spring. With regard to the waterflow path, flowtime and the volume of water flowing through the cross-section of the tested stream, the exhalation coefficient of222Rn from water to atmospheric air is 3.80 Bq/dm3/m, 1.51 Bq/dm3/s and 1. 25 Bq/dm3/dm3, respctively. According to the authors, further research conducted in other springs occurring in other types of rocks and under different flow conditions (at different times of the year) will allow characterizing the dynamics of the process of222Rn release from groundwater through surface waters into the atmosphere. Perhaps this process can be described with a universal mathematical function.
Wrocław University of Science and Technology script entitled „Basics of mining. Part II. The current state and trends in the development of the exploitation of deposits” by Jan Sajkiewicz and Klaus Strzodka from 1977 shows the then perspective on the possibilities of using atomic explosions in mining. The authors presented selected facts from the realization of the American program for the peaceful use of nuclear energy „Plowshare”. As part of it, the possibilities of using atomic explosions for mining ore deposits, coal gasification, activation of old oil wells, mining of bituminous shale and the creation of underground crude oil and natural gas storage facilities were investigated.
Przedstawiono wyniki wstępnego rozpoznania reliktów wydobycia różnych kopalin (surowców dla budownictwa), prowadzonego w rejonie wsi Chrząstawa koło Wrocławia. Są to przede wszystkim dawne wyrobiska po eksploatacji piasków budowlanych, glin, a także głazów narzutowych i prawdopodobnie rudy darniowej. Ukazano ogólną charakterystykę tych kopalin, ze szczególnym uwzględnieniem głazów narzutowych. Zwrócono uwagę na pozostałości stosowanej techniki wstępnego dzielenia głazów za pomocą rzadko rozmieszczonych, małośrednicowych otworów wiertniczych. Zwrócono uwagę na duże potencjalne znaczenie poznawcze i edukacyjne tych reliktów oraz ich rolę w poznaniu i zachowaniu dziedzictwa techniki.
EN
The paper presents the results of the preliminary identification of relics of the extraction of various raw materials for construction carried out in the area of the Chrząstawa village near Wrocław. These are mainly former pits after the exploitation of construction sands, clays, as well as erratic boulders and probably meadow ores. The general characteristics of these minerals is shown, with particular emphasis on erratic boulders. The attention was paid to the remnants of the technique of initial boulder splitting – sparsely spaced, small-diameter boreholes. The great potential cognitive and educational significance of these relics and their role in learning and preserving the heritage of technology have been shown.
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