Temat: radon progeny - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Size distribution of ambient and radioactive aerosols formed by the shortlived radon progeny
Autorzy:: Skubacz, Krystian
Wołoszczuk, Katarzyna
Powiązania:: https://bibliotekanauki.pl/articles/91952.pdf
Data publikacji:: 2019
Wydawca:: Główny Instytut Górnictwa
Tematy:: radon
radon progeny
ambient aerosol
radioactive aerosol
size distribution
pochodne radonu
aerozol atmosferyczny
aerozol radioaktywny
rozkład wielkości
Opis:: The survey of ambient airborne particle size distribution is important when the deposition of radioactive particles is considered in the human lung and the assessment of radiation hazard in occupational exposures or contaminated environments. CLOR (the Central Laboratory for Radiological Protection) in cooperation with CMI (the Central Mining Institute) performed simultaneous measurements of the activity size distribution of radon progeny and ambient aerosols using different types of aerosols. Measurements were performed in a radon chamber with a volume of 17m3, where radon was generated by a radium-226 open source, and ambient aerosols by an oil candle, vax candle, and incense sticks. Such measurements were also made in an aerosol depleted atmosphere after cleaning the chamber air by means of a high-efficiency pump and filters. The size distribution of radioactive aerosols containing radon progeny was measured by RPPSS (Radon Progeny Particle Size Spectrometer) with the measuring size ranging from 0.6 nm to approximately 2500 nm. The key parts of this device are the impaction plates and diffusion screen batteries, which collect aerosols of different sizes, and semiconductor alpha detectors which detect the activity of the collected particles. The SMPS (Scanning Mobility Particle Sizer Spectrometer) and APS (Aerodynamic Particle Sizer) were applied to evaluate the size distribution of all aerosols with sizes from approximately 3 nm to 20 μm. Based on the results obtained by these spectrometers, the activity size distributions and related dose conversion factors (DCF) were evaluated both for the exposed workers and the general population.
Źródło:: Journal of Sustainable Mining; 2019, 18, 2; 61-66
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Transmission of ultrafine particles through separating systems of dust samplers
Autorzy:: Skubacz, K.
Powiązania:: https://bibliotekanauki.pl/articles/92165.pdf
Data publikacji:: 2018
Wydawca:: Główny Instytut Górnictwa
Tematy:: underground mine
short-lived radon progeny
ultrafine particles
cyclone
deposition of particles
górnictwo podziemne
krótkożyciowe produkty rozpadu radonu
cząstki ultradrobne
cyklon
depozycja cząstek
Opis:: In underground mines there is a radiation hazard associated with natural radioactive nuclides. The main sources of radiation exposure in Polish mines are short-lived radon decay products, radioactive mine water containing radium and the sediments precipitated from these waters. For miners, the most common hazard is usually the short-lived radon decay products. Aspirators, equipped with separation systems, are mostly used in order to control this hazard. Inside these aspirators there are meters which measure the radiation emitted by radioactive aerosols collected on the filter. The purpose of these systems is to remove particles from the air stream that do not form the respirable fraction. At the same time, however, a deposition of small-size aerosols takes place in them because of the high values of their corresponding diffusion coefficients. This excludes the possibility of their proper detection by radiation meters. In this paper, the transmission of particles up to 100 nm in size by the separating systems is evaluated. The evaluated transmission ranged from about 60% for sizes of 7 nm, reaching up to 95% at the boundary values of the tested range. The influence of the particle distribution of the aerosols on the radiation calibration coefficients was also investigated in a radon chamber, through their exposure to conditions where the air contained low aerosol concentrations of about 4.0×108 particles/m3 and also when it was nearly 100-times higher. In the first case, the measured sensitivity of the meters was about 20-30% lower, which was probably due to a higher number of small aerosols and, as a result, particle transmission decreased. However, at higher aerosol concentrations, the sensitivity of the meters remained practically the same, regardless of whether the air reached the filters by the separation systems or if they were omitted.
Źródło:: Journal of Sustainable Mining; 2018, 17, 2; 48-55
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The presence and dosimetry of radon and thoron in a historical, underground metalliferous mine
Autorzy:: Kleinschmidt, R.
Watson, D.
Janik, M.
Gillmore, G.
Powiązania:: https://bibliotekanauki.pl/articles/92202.pdf
Data publikacji:: 2018
Wydawca:: Główny Instytut Górnictwa
Tematy:: radon
thoron
progeny
mines
dose
NORM
toron
potomstwo
kopalnie
dawka
Opis:: A combination of long term passive, and short term active radon-222, radon-220 and respective progeny measurements were conducted in both traverse and longitudinal axes of a historical metalliferous underground mine in North Queensland, Australia. While the passive monitor results provided average radon and thoron air concentrations over periods of 70-90 days, active measurements over a four day period provided significantly more detail into the dynamics of radon and progeny concentrations in the naturally ventilated mine environment. Passive monitor concentrations for radon and thoron ranged between 60 and 390 Bq m^-3 (mean: 140 ±55 Bq m^-3) and 140 and 2600 Bq m^-3 (mean: 1070 ±510 Bq m^-3) respectively, with passive thoron progeny monitors providing a mean concentration of 9 ±5 Bq m^-3EEC. Active measurement mean concentrations for radon, thoron, radon progeny and thoron progeny in the centre of the mine drive were 130 ±90 Bq m^-3, 300 ±100 Bq m^-3, 20 ±20 Bq m^-3EEC and 10 ±10 Bq m^-3EEC respectively. It was identified that thoron passive detector placement is critical in establishing reliable monitoring data, and is the reason for the discrepancy between the active and passive thoron results in this study. Site specific progeny measurements are required for the accurate estimation of dose to persons entering the mine. Based on short term active measurements and passive thoron progeny monitor results, the dose contribution from thoron and progeny in the mine was observed to contribute up to 80% of the total radon/thoron inhalation dose, and therefore should not be underestimated in monitoring programs under similar conditions.
Źródło:: Journal of Sustainable Mining; 2018, 17, 3; 120-130
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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