Natural and nuclear fall out radiation in the Příbram area

 

Milan Matolín, Jiří Němeček

Geoscience Research Reports 34, 2001 (GRR for 2000), pages 148–151
Map sheets: Příbram (22-21)

Full text (PDF, 0.18 MB)

 

Abstract

Natural and nuclear fall out radiation has been measured in the area of Příbram, central Bohemia, Czech Republic, as one input parameter for a complex study of the environmental impact on the human health. The demarcated 190 km2 Příbram area of interest covers the zone of acid magmatic rocks of the central Bohemian pluton of medium to high natural radioactivity, and the zone of low radiactive Proterozoic and palaeozoic sediments Contents of natural radionuclides K, U and Th in rocks and nuclear fall isotopes 137Cs and 134Cs were determined by field ground gamma-ary spectrometry dynamic measurements at 164 traverses 300 m long situated around 29 localities, cosmic radiation was calculated after locality elevations and all data were expressed in dose rate (table 1). Results indicate statistically significant difference of mean terrestrial dose rates 79 nGy.h-1 and 40nGy.h-1 resepective zones, while nuclear fall out contamination of the whole area of interest is very low and consistent, specified by the mean 137Cs surface activity of 1.4kBq.m-2 and dose rate of 2.2 nGy.h-1. Observed natural and nuclear fall out radiation can be compared to the range to regional terrestrial dose rate of 6-245nGy.h-1, with a mean 66nGy.h-1, in the Czech Republic.