Temat: radon-220 - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Thorium nuclear fuel - thoron aspect
Autorzy:: Zagórski, Z. P.
Głuszewski, W.
Powiązania:: https://bibliotekanauki.pl/articles/148763.pdf
Data publikacji:: 2010
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: CR-39
nuclear fuel
radon-220
radon-222
thorium fuel
thoron
Opis:: The communication reports a serious complication connected with preparation, storage and transportation of fuel for thorium and uranium/thorium nuclear reactors. Whereas uranium fuel of any degree of enrichment is free from radium, which produces radon-222, thorium itself produces thoron (radon-220). Measurement of thoron by a routine ionization-chamber device around a small sample of 2 g thorium dioxide shows already the health endangerment situation. The presence of thoron is also confirmed by a typical solid state dosemeter (polymer CR-39), exposed to the air around ThO2 and etched afterwards with warm NaOH solution. The unavoidable presence of thoron can cause increase of price of production of nuclear fuel, demanding special approach to the method of manufacture.
Źródło:: Nukleonika; 2010, 55, 3; 407-408
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The characteristics of radon and thoron concentration from soil gas in Shenzhen City of Southern China
Autorzy:: Wang, N.
Zheng, L.
Chu, X.
Li, S.
Yan, S.
Powiązania:: https://bibliotekanauki.pl/articles/148789.pdf
Data publikacji:: 2016
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: 222Rn/220Rn
soil gas
radon mapping
China
Opis:: Radon (222Rn) and thoron (220Rn) from soil gas are very significant factors that can affect the indoor radon level in the first floor or in the basement. China is one of the countries with the highest thorium content in the world. Therefore, it is very significant to study 222Rn/220Rn concentration in the soil in Shenzhen City (SC). A 222Rn/220Rn survey was performed using a portable radon monitor (model RAD7) at 69 sites, covered a total area of 1800 km2 in 2013 to get the original data for radon risk estimation in SC. The average values of 222Rn and 220Rn concentration of soil gas of the total 69 locations are 86 ± 72 kBq•m–3 and 118 ± 85 kBq•m–3, respectively. 222Rn/220Rn concentrations are related to geological lithology. 222Rn concentrations vary from 40 to 370 kBq•m–3 and from 15 to 118 kBq•m–3 in weathered granite products and sediments, respectively, while 220Rn concentrations are from 103 to 435 kBq•m–3 and 2.2 to 96 kBq•m–3. The higher 220Rn values were mainly observed at the sites covered by the weathered granite products. Comparing with the areas of high 222Rn concentration, the areas of high 220Rn values are larger. The distribution of 222Rn concentration in the vertical direction displays an exponential distribution mode, but there is no rule of 220Rn concentration. The investigation suggests that people should pay attention to 220Rn contribution in the radon mapping of SC, as well as in the indoor radon survey.
Źródło:: Nukleonika; 2016, 61, 3; 315-319
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Specific properties of a model of thoron and its decay products in indoor atmospheres
Autorzy:: Meisenberg, O.
Tschiersch, J.
Powiązania:: https://bibliotekanauki.pl/articles/148707.pdf
Data publikacji:: 2010
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: thoron
220Rn
radon
indoor model
decay products
air exchange
spatial distribution
Opis:: Whereas several models of indoor concentrations of radon and its decay products exist, mod els for the occurrence and spatial distribution of thoron (220Rn) and its decay products are lacking. This study highlights the specific properties of the thoron decay chain and presents their consequences for a thoron model. The short half-life of thoron results in an inhomogene ous spatial distribution, which is determined by diffusive and advective transport. The long half- -life of the decay product 212Pb accounts for a strong influence of air exchange on its overall concentration as well as on its unattached fraction. It could further be predicted that also the unattached part of 212Pb is distributed inhomogeneously. The theoretical structure of a thoron model, which can neglect the most short-lived decay products but must account for the influence of air exchange in a stronger way than it is the case for radon, results from these considerations.
Źródło:: Nukleonika; 2010, 55, 4; 463-469
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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