Ventilation Rate for Improving Indoor Radon Level

2005 ◽  
Vol 48 (4) ◽  
pp. 329-335
Author(s):  
Chan Ming-yin ◽  
Ho Hung-kit
Keyword(s):  
Indoor Radon ◽  
Ventilation Rate ◽  
Radon Level

scholarly journals Measurements of Radon-222 and its Daughters Concentrations in Buildings of Department Physics in College of Sciences of Baghdad University

2008 ◽  
Vol 5 (4) ◽  
pp. 605-611
Author(s):  
Baghdad Science Journal
Keyword(s):  
Solid State ◽  
Radon Concentration ◽  
Indoor Radon ◽  
Radon Level ◽  
Nuclear Track Detectors ◽  
Radioactive Sources ◽  
Radon Concentrations

The present work aims to investigate approaches, measures and detection of indoor radon level in buildings of the department of physics in college of science of Baghdad University. CR-39 solid state nuclear track detectors were used to measure the radon concentrations inside the rooms, including five laboratories and five workplace rooms in ground and first storey of the department. The average radon concentration at first storey was found to be 43.1±13.2 Bq/m3 and 40.1±13.4 Bq/m3 at the ground storey. The highest level of radon concentration at the first storey in the radioactive sources store was 87.5±29 Bq/m3 while at the ground storey in room(2) was 70.2±24 Bq/m3 which is due to the existence radioactive sources in some selected places at the buildings.

scholarly journals Efficiency of the chimney effect controlling radon levels indoor

2019 ◽  
Vol 282 ◽  
pp. 02029
Author(s):  
Britt Haker Høegh ◽  
Torben Valdbjørn Rasmussen
Keyword(s):  
Case Studies ◽  
Driving Force ◽  
Indoor Radon ◽  
Single Family ◽  
Outdoor Temperature ◽  
Radon Level ◽  
Suction System ◽  
Thermal Buoyancy ◽  
Chimney Effect ◽  
Indoor And Outdoor

According to the WHO the radioactive gas radon must be controlled indoors. E.g. by naturally driven suction systems based on thermal buoyancy, also denoted the chimney effect, which exploits the difference of indoor- and outdoor temperature to lower radon levels indoor. This paper presents four case studies showing that the efficiency of such systems to control radon level indoors varies, as the outdoor temperature varies throughout the year. The chimney effect was the driving force in the four single-family houses used as case studies. In two cases it was used to increase the indoor air change rate to dilute the radon concentration indoor, in one case it was used to drive a suction system under the ground slab to prevent radon from infiltrating through the ground slab, and in one case both techniques were used in combination. Measurements showed a correlation between a low radon level indoors and an increased difference between the indoor- and outdoor temperature, with the highest temperature indoor. Likely, the temperature difference can provide the needed suction in such systems. Without this driving force – out of the heating season – an increase of the indoor radon level was seen to occur. The needed suction to lower the radon level indoor did not occur in all cases. However, the efficiency of the system was seen to vary throughout the year, and was limited in periods with little difference between the indoor- and the outdoor temperature. Such needs to be taken into account, when the effect of naturally driven suction systems to reduce the radon level indoor are evaluated.

scholarly journals Use of radon barriers to reach an acceptable radon level

2020 ◽  
Vol 172 ◽  
pp. 05003
Author(s):  
Torben Valdbjørn Rasmussen ◽  
Thomas Cornelius
Keyword(s):  
Indoor Air ◽  
Radon Concentration ◽  
Indoor Radon ◽  
Ventilation Rate ◽  
Test Method ◽  
Single Family ◽  
Indoor Radon Concentration ◽  
Radon Exposure ◽  
Air Penetration ◽  
Family House

A method is presented for theoretically estimating the necessary airtightness of a radon barrier. Radon barriers are used to balance the indoor radon concentration. To balance radon at an acceptable level, for a given ventilation rate for indoor air, a barrier must fulfil the requirements for airtightness and the indoor-air radon penetration from the soil, which is determined by the radon concentration in the soil gas. The method identifies the optimal radon barrier for a building. Ten different radon barriers are evaluated. Barriers include system solutions based on materials such as bitumen-based radon blockers, wet-room membranes, reinforced fix mortar pastes, and polyethylene membranes. The barriers are tested using a modified version of the test method NBI 167/02 radon membrane: test of airtightness. The radon barriers are evaluated for a typical building construction for a single-family house with radon exposure from the ground. An acceptable radon concentration of 100 Bq/m3 in indoor air is used in combination with a number of higher radon levels. The different radon barriers are evaluated in accordance with their ability to prevent air penetration from the ground. Furthermore, how mounting a barrier can affect the durability of a building is discussed, as the measures may create a far more vulnerable building.

A Comparison of Preliminary Results of Indoor Radon Behaviour between one Occupied and one Unoccupied Dwelling in Madrid, Spain

2015 ◽  
Vol 238 ◽  
pp. 140-150 ◽  
Author(s):  
J. García-Tobar ◽  
L.F. Mazadiego ◽  
L.S. Quindós-Poncela
Keyword(s):  
Radon Concentration ◽  
Research Laboratory ◽  
Research Study ◽  
Indoor Radon ◽  
Seasonal Pattern ◽  
Residential Building ◽  
The Other ◽  
Indoor Radon Concentration ◽  
Radon Level ◽  
Radon Monitoring

The present paper studies the indoor radon variations in two similar dwellings, one of them occupied and the other unoccupied, from the same residential building. In particular, the research study was carried out in two new dwellings in Madrid. Radon concentration and ambient parameters were measured three-hourly from 11 May to 12 December 2014. Solid state detectors, Radon Scout, were used for the radon monitoring. Simultaneously, two atmospheric variables were acquired from NOAA Air Research Laboratory. The results show that radon level is slightly higher in the unoccupied dwelling than in the other one. From the analysis developed in this study, it is found that a specific seasonal pattern exists in the indoor radon concentration. Besides, the anthropogenic influence is also analysed. Nearly periodical patterns could be observed in specific periods whether dwelling is occupied or not.

Indoor radon level in the dwellings of the Rajshahi and Chuadanga regions of Bangladesh

2001 ◽  
Vol 34 (1-6) ◽  
pp. 497-499 ◽  
Author(s):  
A Srivastava ◽  
M.R Zaman ◽  
K.K Dwivedi ◽  
T.V Ramachandran
Keyword(s):  
Indoor Radon ◽  
Radon Level

VARIATION OF INDOOR RADON CONCENTRATION WITHIN A RESIDENTIAL COMPLEX

2020 ◽  
Vol 189 (3) ◽  
pp. 279-285
Author(s):  
Teofana Sferle ◽  
Gabriel Dobrei ◽  
Tiberius Dicu ◽  
Bety-Denissa Burghele ◽  
Nicoleta Brişan ◽  
...  
Keyword(s):  
Wind Speed ◽  
Correlation Coefficient ◽  
Wind Direction ◽  
Radon Concentration ◽  
Indoor Radon ◽  
Control Variable ◽  
Ventilation Rate ◽  
Indoor Radon Concentration ◽  
Systematic Analysis ◽  
Indoor Pollutants

Abstract A recent challenge in research dedicated to residential exposure to radon comes from the growing number of houses retrofitted to reduce energy consumption. Efficiently insulated buildings and modern architectural solutions can lead to the accumulation of high levels of indoor pollutants. A systematic analysis was conducted in a residential complex (consisting of six houses) in order to assess the annual radon concentration and to evaluate the intensity of the relationships with various factors, such as the indoor-outdoor temperature differences, wind speed and wind direction. Three types of occupational behaviour, influencing the ventilation rate of the dwellings and, implicitly, the indoor radon activity concentration were observed. By calculating the partial correlation coefficient between the radon concentration and the wind direction, with the wind speed as the control variable, for all six houses the correlation coefficient presents negative values.

Field Trials on the Effectiveness of Radon Protection Measures in New Dwellings

1994 ◽  
Vol 56 (1-4) ◽  
pp. 33-40 ◽  
Author(s):  
M. Woolliscroft ◽  
C. Scivyer ◽  
L. Parkins
Keyword(s):  
Indoor Radon ◽  
Field Trials ◽  
Radon Level ◽  
Annual Average ◽  
Protection Measures ◽  
Building Regulations ◽  
South West ◽  
Level 1 ◽  
Protective Membrane

Abstract The purpose of the field trials reported here was to verify the effectiveness of radon protection measures implemented under UK Building Regulations. Measurements were carried out in a total of 423 dwellings using etched track detectors. Some of the dwellings were protected, others were not. Four factors were considered likely to affect the annual average indoor radon level: (1) The radon level of the area. (2) The type of floor construction. (3) The presence or absence of a protective membrane in the floor construction. (4) Whether the dwelling was detached or attached to other dwellings. The radon level of the area is characterised by the proportion of existing houses in the area above the action level. The type of construction is generally in situ concrete floor or block and beam floor. Houses were situated on a total of 33 sites scattered all over Devon and Cornwall in the south west of England (an area of relatively high radon levels) offering a variety of both terrain and housing types. Statistical analysis showed that the effect of the membrane in reducing the radon level was significant at the 0.1% level. The effect of the floor construction, was however only significant at the 5% level. Neither the radon level of the area in which the dwelling was situated nor whether the dwelling was detached or attached had statistically significant effects on the radon level.

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