The influence of particle size distribution on dose conversion factors for radon progeny in the underground excavations of hard coal mine

Skubacz, Krystian; Wojtecki, Łukasz; Urban, Paweł

doi:10.1016/j.jenvrad.2016.05.020

Cited by 15 publications

(7 citation statements)

References 13 publications

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“…However it is not greater than the boundary exposure limit. The concentrations of environmental aerosols are significantly lower than in an active coal mine, where their concentration can reach 140•10 9 particles/m 3 [11]. The ultrafine particles with diameter up to 100 nm predominate in the distribution (table 2) predominate, and the contribution of coarse particles larger than 2.5 μm does not exceed 0.1% in total concentration.…”

Section: Measurements Resultsmentioning

confidence: 89%

Particle size distribution of the radon progeny and ambient aerosols in the Underground Tourist Route “Liczyrzepa” Mine in Kowary Adit

Wołoszczuk

Skubacz

2018

E3S Web of Conferences

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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).

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Section: Measurements Resultsmentioning

confidence: 89%

Particle size distribution of the radon progeny and ambient aerosols in the Underground Tourist Route “Liczyrzepa” Mine in Kowary Adit

Wołoszczuk

Skubacz

2018

E3S Web of Conferences

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“…The ambient aerosol measurements aimed to estimate the size distributions of radioactive aerosols and, subsequently, calculate the dose conversions for radon decay products based on these measurements. The values of these coefficients were determined according to the method described in the publication [ 27 ]. The characteristics of the obtained ambient aerosol size distributions are presented in Table 1 and Table 2 and Figure 5 and Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

“…The air supplied from the surface travelled about 1000 m, becoming enriched in aerosols as it moved through the shaft, especially due to the high humidity of the air in this space. High concentrations were observed in areas close to the mining operations during the operation of mining machines, where the contribution of coarse (2.5–10 μm) and very coarse (>10 μm) particles was noticeably higher than in other areas [ 27 , 28 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Dose Conversions, Equilibrium Factors, and Unattached Fractions on Radon Risk Assessment in Operating and Show Underground Mines

Skubacz

Wołoszczuk

Grygier

et al. 2023

IJERPH

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This paper compares the results of measurements taken in the underground workings of active and tourist mines. In these facilities, the aerosol size distributions of ambient aerosols at key workplaces and the distributions of radioactive aerosols containing radon decay products were determined. Based on these studies, dose conversions used for dose assessment and unattached fractions were determined. In addition, radon activity concentrations and potential alpha energy concentrations of short-lived progeny were also measured in the mines to determine the equilibrium factor. The dose conversions varied between 2–7 mSv/(mJ × h × m−3). The unattached fraction measured in active coal mines ranged from 0.01–0.23, in tourist mines from 0.09–0.44, and in the tourist cave it was 0.43. The results showed significant discrepancies between the effective doses determined from current recommendations and legal regulations and those determined from direct measurements of parameters affecting exposure.

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“…This allows for the assessment of their aerodynamic size. The results that are obtained from spectrometers are combined with a non-linear equation based on particle density and aerodynamic shape factor [8,27]. Aerosols based on salt solution (0.7 g NaCl/dm 3 ) were produced during the study.…”

Section: Methodsmentioning

confidence: 99%

Transport of Aerosols in Underground Mine Workings in Terms of SARS-CoV-2 Virus Threat

et al. 2021

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This paper presents a method of implementation and the results of aerosol dispersion tests in underground mine workings. Numerous tests were carried out to determine the potential risk of SARS-CoV-2 coronavirus infection in the underground environment of the mines. The influence of selected parameters of mine air on the possibility and method of aerosol transmission through ventilation routes was experimentally determined in real conditions. The concentration of additional aerosols in the class of ultrafine and fine aerosols increased with the distance from the generator, while the concentration of coarse particles decreased. Assuming the consumption of the solution with which aerosols were generated, even at a small level of 1 cm3/min., the number of additional aerosols was several hundred particles in one cubic centimeter of air at a distance of 50–70 m from the generator. The concentration of ultrafine particles in the range of 40–20,000 nm increased from 122 particles/cm3 to 209 particles/cm3 at air temperature of 12 °C and relative humidity of 95–96%, and from 90 particles/cm3 to 243 particles/cm3 at air temperature of 17 °C and relative humidity of 76–82%, with the increasing distance from the generator (10 m to 50 m).

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The influence of particle size distribution on dose conversion factors for radon progeny in the underground excavations of hard coal mine

Cited by 15 publications

References 13 publications

Particle size distribution of the radon progeny and ambient aerosols in the Underground Tourist Route “Liczyrzepa” Mine in Kowary Adit

Particle size distribution of the radon progeny and ambient aerosols in the Underground Tourist Route “Liczyrzepa” Mine in Kowary Adit

Influence of Dose Conversions, Equilibrium Factors, and Unattached Fractions on Radon Risk Assessment in Operating and Show Underground Mines

Transport of Aerosols in Underground Mine Workings in Terms of SARS-CoV-2 Virus Threat

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