Natural radioactivity, radon exhalation rates and indoor radon concentration of some granite samples used as construction material in Turkey

2013 ◽  
Vol 157 (1) ◽  
pp. 105-111 ◽  
Author(s):  
A. S. Aykamis ◽  
S. Turhan ◽  
F. Aysun Ugur ◽  
U. N. Baykan ◽  
A. M. Kilic
Keyword(s):  
Natural Radioactivity ◽  
Radon Concentration ◽  
Indoor Radon ◽  
Construction Material ◽  
Indoor Radon Concentration ◽  
Radon Exhalation ◽  
Radon Exhalation Rates ◽  
Granite Samples

Measurement of the radon exhalation rate and effective radium concentration in soil samples of southern Sakarya, Turkey

2016 ◽  
Vol 27 (2) ◽  
pp. 278-288 ◽  
Author(s):  
Emre Tabar ◽  
Hakan Yakut ◽  
Adem Kuş
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Soil Samples ◽  
Effective Dose Equivalent ◽  
Exhalation Rate ◽  
Dose Equivalent ◽  
Indoor Radon Concentration ◽  
Radon Exhalation ◽  
Average Value ◽  
Radon Exhalation Rates

In the present study, radon exhalation rates in terms of mass and area, as well as the effective radium concentration in soil samples collected simultaneously from different districts of southern Sakarya have been measured by Sealed Can technique using LR-115 type-II detectors. Mass and areal radon exhalation rates in soil samples vary from 35.76 ± 1.5 to 253.15 ± 3.8 mBqkg−1h−1 with an average value of 112.53 ± 2.7 mBqkg−1h−1 and 0.73 ± 0.2 to 5.18 ± 0.6 Bqm−2h−1 with an average value of 2.30 ± 0.6 Bqm−2h−1, respectively. The effective radium content was found to vary in the range 3.77 ± 0.5 to 26.69 ± 1.3 Bqkg−1 with an average value of 11.86 ± 0.9 Bqkg−1. The area exhalation rate was also used to calculate indoor radon concentration contributed by radon exhalation from soil, and to estimate annual effective dose equivalent. While the indoor radon concentration contributed by radon exhalation from soil varies from 2.93 ± 0.9 to 20.73 ± 2.3 Bqm−3 with an average value of 9.22 ± 1.5 Bqm−3, the estimated effective dose equivalent varies from 0.09 to 0.61 mSvy−1 with an average value of 0.27 mSvy−1.

VARIATIONS OF INDOOR RADON CONCENTRATION IN TRADITIONAL RUSSIAN RURAL WOODEN HOUSES

2020 ◽  
Vol 191 (2) ◽  
pp. 219-222
Author(s):  
Tatiana Petrova ◽  
Petr Miklyaev
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Ground Surface ◽  
Radon Exhalation Rate ◽  
Exhalation Rate ◽  
Indoor Radon Concentration ◽  
Radon Exhalation ◽  
Soil Gas Radon ◽  
Radon Measurements ◽  
Indoor And Outdoor

Abstract Continuous indoor radon measurements were carried out in two traditional Russian rural houses located in different villages of the Moscow region in summer of 2017 and 2018. In additional, in the summer of 2017, continuous measurements of soil gas radon activity concentration at depth 0.8 m and radon exhalation rate from the ground surface near the house were performed simultaneously. It was found that the indoor radon concentration in rural houses is subject to strong daily variations, which are characterized by highs at night and lows during the day. Indoor radon concentration is directly proportional to indoor and outdoor temperature difference and inversely proportional to wind speed. While the radon exhalation rate from the ground surface, as well as the ventilation of premises (opening doors and windows) practically do not affect the concentration of radon in Russian rural wooden houses.

scholarly journals Radon exhalation rates from common building materials in India: Effect of back diffusion

2016 ◽  
Vol 31 (3) ◽  
pp. 277-281
Author(s):  
Amit Kumar ◽  
Pal Chauhan
Keyword(s):  
Building Materials ◽  
Rice Husk Ash ◽  
Indoor Radon ◽  
Track Detector ◽  
Back Diffusion ◽  
Type Ii ◽  
Indoor Radon Concentration ◽  
Radon Exhalation ◽  
Brick Powder ◽  
Radon Exhalation Rates

A radon exhalation study for building materials was carried out by closed accumulator technique using plastic track detector LR-115 type-II, taking into account the effect of back diffusin. The back diffusion of radon into the materials causes an underestimate of free exhalation rates. The results showed that radon exhalation rates of soil, sand, brick powder, and crasher were found to be high as compared to rice husk ash, wall putty, and plaster of Paris. The radon exhalation rates from building materials varied from 0.45 ? 0.07 mBq/kgh to 1.55 ? 0.2 mBq/kgh and 3.4 ? 0.7 mBq/m2h to 28.6 ? 3.8 mBq/m2h as measured without considering back diffusion. The radon exhalation rates of building materials oblivious of back diffusion varied from 4.3 ? 0.8 mBq/m2h to 44.1 ? 5.9 mBq/m2h. The radon exhalation rates from building materials can be used for estimation of radon wall flux and indoor radon concentration. Thus, it is necessary to make correction in the measured exhalation rates by back diffusion.

Evaluation of the effect of cover layer on radon exhalation from building materials

2020 ◽  
pp. 1420326X2096338
Author(s):  
Chenhua Wang ◽  
Dong Xie ◽  
Chuck Wah Yu ◽  
Hanqing Wang
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Building Materials ◽  
Indoor Radon ◽  
Concrete Block ◽  
Radon Exhalation Rate ◽  
Exhalation Rate ◽  
Indoor Radon Concentration ◽  
Cover Layer ◽  
Radon Exhalation

Radium, which is naturally present in many building materials, decays to the radioactive gas radon, which is exhaled from the surface of concrete block and is a major source of human exposure to radioactivity. In this study, an experimental evaluation of radon exhalation was conducted on a concrete block covered with mortar and acrylic render. Factors such as sand aggregates content and water content of the mortar cover layer, the thickness of the double cover layer were considered. Results showed that the radon exhalation rate was increased with an increase of sand content in mortar cover layer, and the radon exhalation rate was reduced with an increase of the thickness and water content. Besides, indoor radon concentration and effective dose estimation involving concrete block with cover layer were evaluated. The calculated indoor radon concentration was reduced from 234.9 to 201.1 Bq m−3 as the thickness of the cover layer was increased from 15 to 35 mm, and the effective dose was reduced by 0.61 mSv y−1. Therefore, the addition of a cover layer on the indoor walls, floors and ceilings could reduce the indoor radon concentration and the radon dose on exposure to occupants.

scholarly journals High annual radon concentration in dwellings and natural radioactivity content in nearby soil in some rural areas of Kosovo and Metohija

2013 ◽  
Vol 28 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Ljiljana Gulan ◽  
Francesco Bochicchio ◽  
Carmela Carpentieri ◽  
Gordana Milic ◽  
Jelena Stajic ◽  
...  
Keyword(s):  
Effective Dose ◽  
Natural Radioactivity ◽  
Rural Areas ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Natural Radionuclides ◽  
Exposure Period ◽  
Indoor Radon Concentration ◽  
Passive Devices

Some previous studies on radon concentration in dwellings of some areas of Kosovo and Metohija have revealed a high average radon concentration, even though the detectors were exposed for three months only. In order to better design a larger study in this region, the annual measurements in 25 houses were carried out as a pilot study. For each house, CR-39-based passive devices were exposed in two rooms for the two consecutive six-month periods to account for seasonal variations of radon concentration. Furthermore, in order to correlate the indoor radon with radium in nearby soil and to improve the knowledge of the natural radioactivity in the region, soil samples near each house were collected and 226Ra, 232Th, 40K activity concentration were measured. The indoor radon concentration resulted quite high from the average (163 Bq/m3) and generally it did not differ considerably between the two rooms and the two six-month periods. The natural radionuclides in soil resulted to be distributed quite uniformly. Moreover, the correlation between the226Ra content in soil and radon concentration in dwellings resulted to be low (R2=0.26). The annual effective dose from radon and its short-lived progeny (5.5 mSv, in average) was calculated by using the last ICRP dose conversion factors. In comparison, the contribution to the annual effective dose of outdoor gamma exposure from natural radionuclides in soil is nearly negligible (66 mSv). In conclusion, the observed high radon levels are only partially correlated with radium in soil; moreover, a good estimate of the annual average of radon concentration can be obtained from a six-month measurement with a proper choice of exposure period, which could be useful when designing large surveys.

Distribution characteristics on indoor radon concentration of multiple-use facilities in Gwangju area

2019 ◽  
Vol 18 (2) ◽  
pp. 177-184 ◽  
Author(s):  
Min-jin Kim ◽  
Sang-su An ◽  
Min-cheol Cho ◽  
Se-il Park ◽  
Jong-min Kim ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Distribution Characteristics ◽  
Multiple Use ◽  
Indoor Radon Concentration

scholarly journals A new approach to radon temporal correction factor based on active environmental monitoring devices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
T. Dicu ◽  
B. D. Burghele ◽  
M. Botoş ◽  
A. Cucoș ◽  
G. Dobrei ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Residential Buildings ◽  
Indoor Radon ◽  
Smart Device ◽  
Correction Factors ◽  
Indoor Radon Concentration ◽  
Radon Measurements ◽  
The Impact ◽  
Monitoring Devices ◽  
Temporal Correction

AbstractThe present study aims to identify novel means of increasing the accuracy of the estimated annual indoor radon concentration based on the application of temporal correction factors to short-term radon measurements. The necessity of accurate and more reliable temporal correction factors is in high demand, in the present age of speed. In this sense, radon measurements were continuously carried out, using a newly developed smart device accompanied by CR-39 detectors, for one full year, in 71 residential buildings located in 5 Romanian cities. The coefficient of variation for the temporal correction factors calculated for combinations between the start month and the duration of the measurement presented a low value (less than 10%) for measurements longer than 7 months, while a variability close to 20% can be reached by measurements of up to 4 months. Results obtained by generalized estimating equations indicate that average temporal correction factors are positively associated with CO2 ratio, as well as the interaction between this parameter and the month in which the measurement took place. The impact of the indoor-outdoor temperature differences was statistically insignificant. The obtained results could represent a reference point in the elaboration of new strategies for calculating the temporal correction factors and, consequently, the reduction of the uncertainties related to the estimation of the annual indoor radon concentration.

Sign in / Sign up

Export Citation Format

Share Document