Detection systems for continuous monitoring of ²²²Rn and its short-lived products in the atmosphere

Radon and its transformation products are useful tracers of the vertical exchange processes in the atmosphere, the transport and the residence time of aerosols in the atmosphere and the like. At our workplace, a detection system based on a Si detector with a 450 mm² sensitive area was built for continuous monitoring of short-lived ²²²Rn transformants. Air is passed through the filter located in close proximity to the detector on which aerosol particles are captured. Determination of activity of short-lived radon conversion products (²¹⁸Po, ²¹⁴Pb, ²¹⁴Bi and ²¹⁴Po) is performed by the three-point measurement method (1^st interval: air pressure + 20 minutes, 2^nd interval: 30 minutes, 3^rd interval: - 70 minutes), while the number of pulses registered in the three energy windows ²¹⁸Po, ²¹⁴Po and ²¹²Po are used to calculate the activities. (authors)