ISSN 1392-110X
ISSN 2029-056X (online)
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2006 m. Nr. 3
Natural radionuclides in the soil of the Vilnius city and assessment of their hazard
Milda PEČIULIENĖ, Dainius JASAITIS, Aloyzas GIRGŽDYS
The radioisotopic composition of different soil types of the Vilnius city (54°40’N, 25°20’E), the capital and the biggest city of Lithuania, was identified. The specific activities of natural radionuclides in the soil were measured with a gamma spectrometric system containing a HPGe detector. The specific activities of natural radionuclides 226Ra, 232Th and 40K in samples of different granulometric composition were measured. The maximum values of 40K were identified in the southeastern and eastern parts of the city (about 479 Bq/kg) and the minimum values in the northern and western parts (about 200 Bq/kg). The maximum values of 226Ra and 232Th specific activities were measured in the southern and southeastern regions (23 Bq/kg and 8 Bq/kg, respectively) and the minimum values in the central part of the city (7 Bq/kg and 3 Bq/kg, respectively). The contribution to the external equivalent dose rate of separate gamma emitters 226Ra, 232Th and 40K was estimated. In the Vilnius city, the radiation of the equivalent dose rate makes up on average 12 nSv/h due to 40K present in the soil, 6 nSv/h due to 226Ra, 3 nSv/ h due to 232Th.
Keywords: sand, sandy loam, clay loam, natural radionuclides, equivalent dose rate, specific activity, Lithuania
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