The aerosol particle size distributions of uranium and its daughter products were studied and determined in the area of the Rožná mine, which is the last active uranium mine in the Czech Republic. A total of 13 samples were collected using cascade impactors from three sites that had the highest expected levels of dust, namely, the forefield, the end of the ore chute and an area close to workers at the crushing plant. The characteristics of most size distributions were very similar; they were moderately bimodal, with a boundary approximately 0.5 μm between the modes. The activity median aerodynamic diameter (AMAD) and geometric standard deviation (GSD) were obtained from the distributions beyond 0.39 μm, whereas the sizes of particles below 0.39 μm were not differentiated. Most AMAD and GSD values in the samples ranged between 3.5 and 10.5 μm and between 2.8 and 5.0, respectively. The geometric means of the AMADs and GSDs from all of the underground sampling sites were 4.2 μm and 4.4, respectively, and the geometric means of the AMADs and GSDs for the crushing plant samplings were 9.8 μm and 3.3, respectively. The weighted arithmetic mean of the AMADs was 4.9 μm, with a standard error of 0.7 μm, according to the numbers of workers at the workplaces. The activity proportion of the radon progeny to (226)Ra in the aerosol was 0.61.
- MeSH
- aerosoly MeSH
- hornictví * MeSH
- monitorování radiace MeSH
- radioaktivní látky znečišťující vzduch analýza MeSH
- radium analýza MeSH
- uran * MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Česká republika MeSH
Following the Fukushima accident, a series of aerosol samples were taken between 24th March and 13th April 2011 by cascade impactors in the Czech Republic to obtain the size distribution of (131)I, (134)Cs, (137)Cs, and (7)Be aerosols. All distributions could be considered monomodal. The arithmetic means of the activity median aerodynamic diameters (AMADs) for artificial radionuclides and for (7)Be were 0.43 and 0.41 μm with GDSs 3.6 and 3.0, respectively. The time course of the AMADs of (134)Cs, (137)Cs and (7)Be in the sampled period showed a slight decrease at a significance level of 0.05, whereas the AMAD pertaining to (131)I increased at a significance level of 0.1. Results obtained after the Fukushima accident were compared with results obtained after the Chernobyl accident. The radionuclides released during the Chernobyl accident for which we determined the AMAD fell into two categories: refractory radionuclides ((140)Ba, (140)La (141)Ce, (144)Ce, (95)Zr and (95)Nb) and volatile radionuclides ((134)Cs, (137)Cs, (103)Ru, (106)Ru, (131)I, and (132)Te). The AMAD of the refractory radionuclides was approximately 3 times higher than the AMAD of the volatile radionuclides; nevertheless, the size distributions for volatile radionuclides having a mean AMAD value of 0.51 μm were very close to the distributions after the Fukushima accident.
- MeSH
- černobylská havárie * MeSH
- havárie elektrárny Fukušima * MeSH
- monitorování radiace metody MeSH
- radioaktivní látky znečišťující vzduch analýza MeSH
- radioizotopy cesia analýza MeSH
- radioizotopy jodu analýza MeSH
- radionuklidy analýza MeSH
- ruthenium analýza MeSH
- velikost částic * MeSH
- zirkonium analýza MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- MeSH
- cholesterol krev MeSH
- dospělí MeSH
- kyselina močová krev MeSH
- lidé středního věku MeSH
- lidé MeSH
- lipoproteiny HDL krev MeSH
- obezita dietoterapie MeSH
- redukční dieta MeSH
- riziko MeSH
- triglyceridy krev MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- srovnávací studie MeSH
206 s. : il.
1.vyd. 20¨6 s.
- MeSH
- antropologie fyzická metody MeSH
- antropometrie metody MeSH
- biometrie metody MeSH
- dítě MeSH
- lidé MeSH
- mladiství MeSH
- novorozenec MeSH
- porodní hmotnost MeSH
- Romové MeSH
- statistika jako téma MeSH
- tělesná hmotnost MeSH
- tělesné váhy a míry MeSH
- Check Tag
- dítě MeSH
- lidé MeSH
- mladiství MeSH
- novorozenec MeSH
- Geografické názvy
- Československo MeSH
129 s. : il.
