Abstract
Central Laboratory for Radiological Protection, in cooperation with Central Mining Institute performed measurements of radon concentration in air, potential alpha energy concentration (PAEC), particle size distribution of the radon progeny and ambient aerosols in the Underground Tourist-Educational Route “Liczyrzepa” Mine in Kowary Adit. A research study was developed to investigate the appropriate dose conversion factors for short-lived radon progeny. The particle size distribution of radon progeny was determined using Radon Progeny Particle Size Spectrometer (RPPSS). The device allows to receive the distribution of PAEC in the particle size range from 0.6 nm to 2494 nm, based on their activity measured on 8 stages composed of impaction plates or diffusion screens. The measurements of the ambient airborne particle size distribution were performed in the range from a few nanometres to about 20 micrometres using Aerodynamic Particle Sizer (APS) spectrometer and the Scanning Mobility Particle Sizer Spectrometer (SMPS).
Highlights
1.1 Radon and its progenyThere are three natural radioactive series in the environment, in each there is an isotope of radium and its decay products radon (222Rn), thoron (220Rn) or actinon (219Rn)
The second uses the biokinetic and dosimetric models developed by the International Commission on Radiological Protection (ICRP)
2.1 RPPSS Central Laboratory for Radiological Protection is equipped with the Radon Progeny Particle Size Spectrometer (RPPSS) that is able to determine effective dose related to radon progeny according to the dosimetric model recommended by International Commission on Radiological Protection (ICRP) [4], taking into account the size distribution of particles compound of these progeny and ambient aerosols
Summary
There are three natural radioactive series in the environment, in each there is an isotope of radium and its decay products radon (222Rn), thoron (220Rn) or actinon (219Rn). At a higher ventilation rate via mouth, the aerosol deposition in the respiratory system is mainly connected to the inertia forces This mechanism occurs for particles with diameters greater than 4 μm. The high dose conversion factors correspond to coarse particles close to size of 10 μm but their concentration in the air is usually small. The annual effective dose, a measure of this hazard, is calculated as a product of the potential alpha energy concentration in the air (PAEC), exposition time (t), and a dose conversion factor (DCF). The second uses the biokinetic and dosimetric models developed by the International Commission on Radiological Protection (ICRP) This model is used to determine the deposition of inhaled radionuclides in the various regions of the respiratory system as a function of inhaled particle size [4]
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