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Construction of new houses on a uranium vein outcrop : a case study from the Czech Republic

Goliáš V., Tumurkhuu G., Kohn P., Šálek O., Plášil J., Škoda R., Soumar J.

Nukleonika

2016

Vol. 61, No. 3

343--349

Significant uranium mineralization represented by a typical assemblage of uranyl supergene minerals in a quartz-uraninite vein hosted in the exocontact zone of the Variscan-Tanvald granite was found at a new construction site in the municipality of Jablonec n. Nisou. Activities of 222Rn in soil gas reached 1 MBq/m3 around two houses, with a maximum of 3.33 MBq/m3 between them on a uranium ore lens outcrop. The uranium content reaches up to 291 ppm eU (3595 Bq/kg 226Ra), and it is possible to find many ‘hot’ pieces of uranium ore fragments with a high percentage of uranium in the Quaternary cover in this place. This unfavourable situation is a result of an improper spatial planning process. The constructor was given the permission to construct the building even though the construction site did not meet safety requirements and the geological survey had failed. Not only geological prospecting was underestimated, but also the radon risk assessment was undervalued.

Radon research and practice in Bulgaria : from retrospective measurements to mitigation

Pressyanov D. S.

Nukleonika

2010

Vol. 55, No. 4

477-482

An overview of ongoing directions of radon studies in the Faculty of Physics, St. Kliment Ohridski University of Sofia is presented. The focus is on: 1) Study and implementation of the polycarbonate method for measuring 222Rn. In this respect the results from laboratory and field experience with this method are summarized. Its potential for precise retrospective measurements by home stored CDs/DVDs is emphasized. 2) Surveys in radon risk areas in the country. The approaches and results in this direction are illustrated on the example of the town of Rakovski. In this town lung cancer risk is twice increased for both sexes. Significantly high 222Rn concentrations were observed in most of the houses and this can be the major factor contributing to the risk. 3) Mitigation of dwellings with high radon content. Mitigation works were recently initiated and our experience with passive radon barriers and active sub-slab depressurization systems is shared. Summarizing the results in all the three directions we conclude that there is a basis to enhance radon research and practice in the country. To be more efficient, these activities need collaboration with medical authorities, civil engineers and, especially in research, with international teams working in the field.