LONG TERM MEASUREMENTS OF INDOOR RADON EQUILIBRIUM FACTOR

2012 ◽  
Vol 102 (4) ◽  
pp. 459-462 ◽  
Author(s):  
Naomi H. Harley ◽  
Jing Chen ◽  
Passaporn Chittaporn ◽  
Atsuyuki Sorimachi ◽  
Shinji Tokonami
Keyword(s):  
Indoor Radon ◽  
Equilibrium Factor

Long term and equilibrium factor indoor radon measurements

1998 ◽  
Vol 236 (1-2) ◽  
pp. 231-238 ◽  
Author(s):  
T. Martinez ◽  
J. Lartigue ◽  
M. Navarrete ◽  
L. Cabrera ◽  
P. Gonzalez ◽  
...  
Keyword(s):  
Indoor Radon ◽  
Equilibrium Factor ◽  
Radon Measurements

scholarly journals Indoor radon concentration and a diffusion model in dwellings situated in a subalkaline granitoid area, Southern Brazil

2021 ◽  
Vol 80 (17) ◽  
Author(s):  
G. Romero-Mujalli ◽  
A. Roisenberg ◽  
A. Cordova-Gonzalez ◽  
P. H. P. Stefano
Keyword(s):  
Diffusion Model ◽  
Indoor Radon ◽  
Southern Brazil ◽  
High Concentration ◽  
Indoor Radon Concentration ◽  
One Dimensional ◽  
Environmental Limits ◽  
Radon Measurements ◽  
Cr 39 Detectors

AbstractRadon (Rn), a radioactive element, has especial interest in medical geology because long-term exposure to high concentration is related to lung cancer. In this study, outdoor and indoor radon measurements were conducted in dwellings of the Piquiri Syenite Massif, located in southern Brazil, given the relative high Rn content in soils of this region. Measurements were done using CR-39 detectors and placing them inside and outside dwellings. Moreover, a one-dimensional diffusion model was performed in order to quantify the natural transport of Rn to the air in confined and aerated environments. Results indicate that the region presents relatively low air Rn concentrations, within the environmental limits; however, the health risk might increase in confined and ill-ventilated environments because of transfer from soil and exhalation from ornamental rock-material often found inside dwellings. The main north facies of the syenite, where most of the rock extractions are located, was found to have the highest air Rn concentration because of the higher soil Rn concentration, compared to other facies of the syenite.

scholarly journals Long-Term Impacts of Weather Conditions on Indoor Radon Concentration Measurements in Switzerland

Atmosphere ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 92
Author(s):  
Joan Frédéric Rey ◽  
Stéphane Goyette ◽  
Mauro Gandolla ◽  
Martha Palacios ◽  
Fabio Barazza ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Weather Conditions ◽  
Indoor Environments ◽  
Indoor Radon Concentration ◽  
Prone Area ◽  
Building Characteristics ◽  
Study Sites ◽  
Radon Measurements

Radon is a natural and radioactive gas that can accumulate in indoor environments. Indoor radon concentration (IRC) is influenced, among other factors, by meteorology, which is the subject of this paper. Weather parameters impact indoor radon levels and have already been investigated, but rarely in Switzerland. Moreover, there is a strong need for a better understanding of the radon behaviour inside buildings in Switzerland for public health concerns as Switzerland is a radon prone area. Based on long-term, continuous, and hourly radon measurements, radon distributions classified according to different weather event definitions were investigated and then compared at three different study sites in Western Switzerland. Outdoor temperature influences the most indoor radon, and it is globally anti-correlated. Wind influences indoor radon, but it strongly depends on intensity, direction, and building characteristics. Precipitation influences periodically indoor radon levels relatively to their intensity. Atmospheric pressure and relative humidity do not seem to be huge determinants on IRC. Our results are in line with previous findings and provide a vivid example in Western Switzerland. This paper underlines the different influence complexities of radon, and the need to communicate about it within the broader public and with construction professionals, to raise awareness.

scholarly journals THE INFLUENCE OF AEROSOL CONCENTRATION ON CHANGES IN THE VOLUMETRIC ACTIVITIES OF INDOOR RADON SHORT-TERM DECAY PRODUCTS

2010 ◽  
Vol 2 (5) ◽  
pp. 81-86 ◽  
Author(s):  
Diana Politova ◽  
Dainius Jasaitis
Keyword(s):  
Particle Concentration ◽  
Indoor Radon ◽  
Aerosol Particles ◽  
Alpha Particles ◽  
Aerosol Concentration ◽  
Short Term ◽  
Volumetric Activity ◽  
Equilibrium Factor ◽  
Decay Products ◽  
Unattached Fraction

The article describes the influence of aerosol concentration on changes in the volumetric activities of indoor radon short-term decay products. The concentration of aerosol in the air, equilibrium factors and unattached fraction were measured under normal living conditions when the concentration of aerosol increases, i.e. burning a candle or frankincense in accommodations, smoke-filled accommodations, a steamy kitchen etc. It has been established that when the concentration of aerosol in the air rises, the number of free atoms of radon short-term decay products attached to aerosol particles also increases, and therefore higher volumetric activity of alpha particles is fixed. A tight positive connection of the correlation between equilibrium factor (F) and aerosol particle concentration in the air of accommodations as well as a negative correlation between unattached fraction and an equilibrium factor have been determined.

scholarly journals Problems in radon measurements in context of epidemiological studies

2004 ◽  
Vol 12 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Ilia Yarmoshenko ◽  
Ivan Kirdin
Keyword(s):  
Temporal Variation ◽  
Indoor Radon ◽  
Epidemiological Studies ◽  
Radon Progeny ◽  
Indoor Radon Concentration ◽  
Special Investigation ◽  
Equilibrium Factor ◽  
Average Value ◽  
Long Time ◽  
Gas Measurements

Epidemiological case control study is considered to be primary instrument to investigate the relationship between population indoor radon exposure and risk of lung cancer. A number of such studies had been completed in last 15 years and others are running now. Considering indoor radon and progeny some specific efforts should be undertaken to assess the exposure. While the lungs exposure after inhalation arises mainly due to radon progeny, in the case of the radon gas measurements application the researchers have to address the disequilibrium between radon and radon progeny. It is widely accepted by researchers and approved by ICRP that worldwide average value of equilibrium factor is 0.4 though real equilibrium factor value can deviate significantly from average. Temporal variation of indoor radon concentration complicates the evaluation of exposure as well. Three types of variation can be emphasized: diurnal, seasonal and long time. Experimental and modeling investigation of radon entry shown that pattern of indoor radon temporal variation firmly depends on relationship between entry rates of primary radon sources (diffusive and advective) and influencing factors are construction characteristics, climatic condition and life style. To find appropriate parameters describing radon disequilibrium and temporal variation it is necessary to perform special investigation in the representative sample of houses.

SHORT-TERM ANNUAL VARIATIONS OF RADON CONCENTRATION IN WORKPLACES: SOME RESULTS IN A RESEARCH INSTITUTE

2020 ◽  
Vol 191 (2) ◽  
pp. 138-143
Author(s):  
G Venoso ◽  
M Ampollini ◽  
S Antignani ◽  
M Caprio ◽  
C Carpentieri ◽  
...  
Keyword(s):  
Radon Concentration ◽  
Indoor Radon ◽  
Scientific Journals ◽  
Short Term ◽  
Indoor Radon Concentration ◽  
Annual Average ◽  
Annual Variations ◽  
Council Directive ◽  
Research Institute

Abstract Many international and national regulations on radon in workplaces, including the 2013/59/Euratom Council Directive, are based on the annual average of indoor radon concentration, assuming it is representative of the long-term average. However, a single annual radon concentration measurement does not reflect annual variations (i.e. year-to-year variations) of radon concentration in the same location. These variations, if not negligible, should be considered for an optimized implementation of regulations. Unfortunately, studies on annual variations in workplaces can be difficult and time-consuming and no data have been published on scientific journals on this issue. Therefore, we carried out a study to obtain a first evaluation of short-term annual variations in workplaces of a research institute in Rome (Italy). The radon concentration was measured in 120 rooms (mainly offices and laboratories) located in 23 buildings. In each room, two 1-year long measurements were performed, with an interval between the two measurements of up to 3 years. The results show variability between the two 1-year long measurements higher than the variability observed in a sample of dwellings in the same area. Further studies are required to confirm the results and to extend the study to other types of workplaces.

Short and long term indoor radon survey in Mexico City

2001 ◽  
Vol 34 (1-6) ◽  
pp. 545-548 ◽  
Author(s):  
F Franco-Marina ◽  
N Segovia ◽  
W Ruiz ◽  
L Godinez ◽  
L Tavera ◽  
...  
Keyword(s):  
Mexico City ◽  
Indoor Radon ◽  
Short And Long Term ◽  
Radon Survey

Long-term Radon Levels and Equilibrium Factor in Some Spanish Workplaces Measured with a Passive Integrating Detector

1999 ◽  
Vol 85 (1) ◽  
pp. 233-236 ◽  
Author(s):  
C. Baixeras ◽  
K. Amgarou ◽  
Ll. Font ◽  
C. Domingo
Keyword(s):  
Equilibrium Factor
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