Wszystkie pola: 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:: The influence of air conditioning changes on the effective dose due to radon and its short-lived decay products
Autorzy:: Grządziel, A.
Kozak, K.
Mazur, J.
Połednik, B.
Dudzińska, M. R.
Bilska, I.
Powiązania:: https://bibliotekanauki.pl/articles/147303.pdf
Data publikacji:: 2016
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: radon
radon progeny
attached fraction of radon progeny
unattached fraction of radon progeny
dose conversion factor
Opis:: Most people spend the majority of their time in indoor environments where the level of harmful pollutants is often significantly higher than outdoors. Radon (222Rn) and its decay products are the example of radioactive pollutants. These radioisotopes are the main source of ionizing radiation in non-industrial buildings. The aim of the study was to determine the impact of air-conditioning system on radon and its progeny concentrations and thus on the effective dose. The measurements were carried out in the auditorium at the Environmental Engineering Faculty (Lublin University of Technology, Poland). Measurements of radon and its progeny (in attached and unattached fractions) as well as measurements of the following indoor air parameters were performed in two air-conditioning (AC) operation modes: AC ON and AC ON/OFF. The air supply rate and air recirculation were taken into consideration. The separation of radon progeny into attached and unattached fractions allowed for determining, respectively, the dose conversion factor (DCF) and the inhalation dose for teachers and students in the auditorium. A considerable increase of the mean radon progeny concentrations from 1.2 Bq/m3 to 5.0 Bq/m3 was observed in the AC ON/OFF mode compared to the AC ON mode. This also resulted in the increase of the inhalation dose from 0.005 mSv/y to 0.016 mSv/y (for 200 h/year). Furthermore, the change of the air recirculation rate from 0% to 80% resulted in a decrease of the mean radon concentration from 30 Bq/m3 to 12 Bq/m3 and the reduction of the mean radon progeny concentration from 1.4 Bq/m3 to 0.8 Bq/m3. This resulted in the reduction of the inhalation dose from 0.006 mSv/y to 0.003 mSv/y.
Źródło:: Nukleonika; 2016, 61, 3; 239-244
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Exposures from radon, thoron, and thoron progeny in high background radiation area in Takandeang, Mamuju, Indonesia
Autorzy:: Saputra, Miki Arian
Nugraha, Eka Djatnika
Purwanti, Tri
Arifianto, Rokhmat
Laksmana, Roza Indra
Hutabarat, Richard P.
Hosoda, Masahiro
Tokonami, Shinji
Powiązania:: https://bibliotekanauki.pl/articles/146926.pdf
Data publikacji:: 2020
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: CR-39
high background radiation area
RADUET
radon
thoron
thoron progeny
Opis:: The exposure from radon, thoron, and thoron progeny was measured for 45 dwellings in high background radiation area in Takandeang, Indonesia with ambient dose equivalent rate ranging from 0.34 µSv•h-1 to 1.90 µSv•h-1 . The measurement was taken using passive radon and thoron discriminative detector and thoron progeny detector. This measurement was taken from November 2018 to October 2019, and within one month the detector would be replaced with a new detector. The concentrations of radon, thoron, and thoron progeny were calculated as 42–490 Bqm−3 , 20–618 Bqm−3 , and 4–40 Bqm−3 , respectively. The concentrations for outdoor were 49–435 Bqm−3 , 23–457 Bqm−3 , and 4–37 Bqm−3 , respectively, and the annual effective dose was 9.8–28.6 mSv•y-1 . Based on the result of Spearman’s correlations analysis between the indoor radon and thoron concentrations and between the indoor thoron progeny and thoron concentrations, we suggest that exposure to thoron cannot be predicted from exposure to radon, and the equilibrium equivalent thoron concentration has a large uncertainty when it is estimated from thoron concentration assuming a single thoron equilibrium factor.
Źródło:: Nukleonika; 2020, 65, 2; 89-94
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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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Skocz do pozycji: 5.

Tytuł:: Indoor and outdoor 222Rn and 220Rn and their progeny levels surrounding Bayan Obo mine, China
Autorzy:: Wang, Nanping
Hu, Miao
Zeng, Weihua
Yu, Cong
Jia, Binlin
Yang, Zhijie
Powiązania:: https://bibliotekanauki.pl/articles/146589.pdf
Data publikacji:: 2020
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: radon
thoron
thoron progeny
equilibrium equivalent thoron concentration
Rn equilibrium factor
Bayan Obo
Opis:: More than half of the total natural ionizing radiation dose received by the human population is caused by radon and thoron (Rn and Tn) and their progeny. To estimate the level of radiation due to radon and thoron and their progeny, an investigation was conducted in a residential area near the world’s largest open-pit mine of Bayan Obo in Inner Mongolia, China. The concentration of Rn, Tn, and their decay products in air and soil were studied by using AlphaGUARD, RAD7, and ERS-RDM-2S for a discrete period of time in three different locations. The average indoor concentration of radon and thoron was 62.6 ± 44.6 Bq/m3 and 108.3 ± 94.5 Bq/m3 respectively, and the outdoor concentration was 12.9 ± 6.3 Bq/m3 and 55.8 ± 18.5 Bq/m3 , respectively. Relatively high concentrations were recorded in the area near to the mine, with a significant increasing trend observed in indoor thoron concentration. A prominent hotspot in thoron concentration was found in a single-story house with values 747 ± 150 Bq/m3 . The equilibrium equivalent thoron concentration (EECTn) varies from 0.48 Bq/m3 to 2.36 Bq/m3 with an arithmetic mean of 1.37 ± 0.64 Bq/m3 , and comparatively higher than EECRn. Concluding that the mining activity at Bayan Obo mine is significantly increasing the level of indoor thoron and its progeny in surroundings. It is suggested to further systematically investigate the indoor Rn and Tn progeny concentrations in the residential dwellings of the Bayan Obo mining area, and 232Th content of the building materials, to provide a basis for calculating the radiation dose.
Źródło:: Nukleonika; 2020, 65, 2; 145-148
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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