Despite its undeniable advantages, the operation of a CT scanner also carries risks to human health. The CT scanner is a source of ionizing radiation, which also affects people in its surroundings. The aim of this paper is to quantify the radiation exposure of workers at a 3D CT wood scanning workplace and to determine a monitoring program based on measurements of ionizing radiation levels during the operation of a CT log scanner. The workplace is located in the Biotechnology Park of the National Forestry Centre. The ionizing radiation source is located in a protective cabin as a MICROTEC 3D CT machine with an X-ray lamp as X-ray source. The CT scanner is part of the 3D CT scanning line and its function is continuous quality scanning or detection of internal defects of the examined wood. The measurement of leakage radiation during scanning is performed with a metrologically verified meter. The measured quantity is the ambient dose equivalent rate H˙*10. The results of the measurements at the selected measurement sites have shown that, after installation of additional safety barriers, the CT scanner for the logs complies with the most strict criteria in terms of radiation protection. Workers present at the workplace during the operation of the CT scanner are not exposed to radiation higher than the background radiation level.

Faculty of Ecology and Environmental Sciences Department of Environmental Engineering Technical University in Zvolen T G Masaryka 24 960 01 Zvolen Slovakia

Faculty of Forestry and Wood Technology Mendel University in Brno Zemědělská 1665 1 613 00 Brno Czech Republic

Faculty of Wood Sciences and Technology Department of Physics Electrical Engineering and Applied Mechanics Technical University in Zvolen T G Masaryka 24 960 01 Zvolen Slovakia

National Forest Centre Forest Research Institute T G Masaryka 22 960 01 Zvolen Slovakia

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