Monitoring of natural radioactivity in Slovakia

Conclusions from monitoring of two main natural sources of human exposure in Slovak Republic are presented: the outdoor photon dose equivalent rate (H) over dot(x) and indoor radon volume activity. Dose equivalent rates were determinated by on-line monitoring network IRIS, and off-line territorial TLD network as well. Radon volume activity was determinated by solid state track detectors CR-39. The annual effective dose from external exposure, determinated by IRIS network, is equal to 816 mSv.y(-1) Lower value, 618 mSv.y(-1) had been found from TLD network data. The effective dose caused by inhalation of radon and its progeny lays within the range 1.7 to 5.0 mSv.y(-1). Such broad range is caused mainly by uncertainties in calculation procedures of radon effective doses.