This paper deals with the measurement of ionising radiation emitted in the vertical field of electric discharge generated between the tip and the grounded plate electrode. The generator set-up was for 400 consecutive negative discharges with voltage amplitude 0.9 MV, waveform shape 1.2/50 $\mu $s, discharge energy 80 kJ and electrodes 1 m apart. Thermoluminescent, passive detectors were used to avoid electromagnetic interference from the discharge. The detectors were placed at the electrodes and three vertical positions 1 m from the discharge axis. This work extends a previous study focused on dosimetry in the plane parallel to the ground. This experiment confirmed the presence of a photon/electron component at the electrode tip and 0.5 m vertical position at a distance of 1 m from the discharge axis. In addition, the presence of neutrons was found for new positions in the vertical axis and the ground electrode.

Brno University of Technology Faculty of Electrical Engineering and Communication 601 90 Brno Czech Republic

Czech Technical University Prague Faculty of Electrical Engineering 160 00 Prague Czech Republic

Czech Technical University Prague Faculty of Nuclear Sciences and Physical Engineering 115 19 Prague Czech Republic

Department of Radiation Dosimetry Nuclear Physics Institute of the Czech Academy of Sciences 180 00 Prague Czech Republic

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