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Wyszukujesz frazę "radon progeny" wg kryterium: Wszystkie pola


Wyświetlanie 1-2 z 2
Tytuł:
Deconvolution of alpha spectra from air filters applied for measurements of the short-lived radon progeny concentration
Autorzy:
Skubacz, K.
Powiązania:
https://bibliotekanauki.pl/articles/148906.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha spectroscopy
ambient pressure
spectrum analysis
non-linear regression
radon progeny
thoron progeny
Opis:
The paper contains a description of a method for the analysis of the complex alpha spectra generated during the measurement of the activity of filters outside of a vacuum chamber under environmental conditions. The peaks corresponding to the energies of alpha particles emitted by the specific isotopes are particularly large on the low-energy side of the peak maximum, and the energy resolution strongly depended on the applied filters. The analysis was based on the non-linear regression to a function designed for four, six and eight parameters. Satisfactory results were obtained for each of these functions, and the best-fitting results were achieved for the eight-parameter function. In addition, the uncertainties related to the estimated parameters, as well as the signals corresponding to functions that describe the shape of the energy peak, have been evaluated. There are also examples of the implementation of the method with respect to short-lived radon progeny and thoron decay products.
Źródło:
Nukleonika; 2017, 62, 3; 229-234
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
    Wyświetlanie 1-2 z 2

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