Simultaneous measurements of indoor radon and thoron and inhalation dose assessment in Douala City, Cameroon

2019 ◽  
Vol 55 (5) ◽  
pp. 499-510 ◽  
Author(s):  
Takoukam Soh Serge Didier ◽  
Saïdou ◽  
Shinji Tokonami ◽  
Masahiro Hosoda ◽  
Takahito Suzuki ◽  
...  
Keyword(s):  
Indoor Radon ◽  
Dose Assessment ◽  
Inhalation Dose ◽  
Simultaneous Measurements

Simultaneous measurements of radon, thoron and their progeny for inhalation dose assessment in indoors of Srinagar, J&K, India

2020 ◽  
Vol 325 (1) ◽  
pp. 315-328 ◽  
Author(s):  
Salik Nazir ◽  
Shakeel Simnani ◽  
Rosaline Mishra ◽  
Tanu Sharma ◽  
Sajad Masood
Keyword(s):  
Dose Assessment ◽  
Inhalation Dose ◽  
Simultaneous Measurements

Numerical investigation of radon dispersion and dose assessment for typical ventilation schemes with an air purifier

2020 ◽  
Vol 30 (1) ◽  
pp. 114-128
Author(s):  
Dong Xie ◽  
Chenhua Wang ◽  
Chuck W Yu ◽  
Hanqing Wang
Keyword(s):  
Mechanical Ventilation ◽  
Effective Dose ◽  
Natural Ventilation ◽  
Indoor Radon ◽  
Radioactive Decay ◽  
Dose Assessment ◽  
Radiological Protection ◽  
Ventilation Condition ◽  
Air Supply ◽  
Air Purifier

Radon is a radioactive pollutant that could pose hazards to the surrounding environment and people due to its radioactive decay progenies. In this study, numerical simulations of radon dispersion were conducted under natural and mechanical ventilation with an air-purifier for radon. Factors such as the air supply speed, position and air supply angles of the purifier were considered. Results showed that the increase in the air supply speed from the purifier was an effective solution to reduce indoor radon pollution. The effect was better when the purifier was in the middle of the room. The purification effect was similar when the air supply changed under natural ventilation, while purification function was more effective when the air supply angle was 60° under the mechanical ventilation condition. An effective dose estimation involving typical ventilation schemes with radon purifier was evaluated. Using this approach, the radiation effect on occupants was computed. The calculated effective dose was 0.9 mSv y−1 when the air supply speed of the purifier was 0.2 m s−1 under natural ventilation. As a result, the effective dose calculated was under the annual effective dose limit of 3–10 mSv y−1 recommended by the International Commission on Radiological Protection (ICRP) for public exposure.

Estimation of indoor radon, thoron and their decay products’ concentrations along with annual inhalation dose in dwellings of Punjab, India

2016 ◽  
Vol 27 (3) ◽  
pp. 380-389 ◽  
Author(s):  
Komal Saini ◽  
B. K. Sahoo ◽  
Bikramjit Singh Bajwa
Keyword(s):  
Indoor Radon ◽  
Research Centre ◽  
Reference Level ◽  
Radiological Protection ◽  
Inhalation Dose ◽  
Study Region ◽  
Average Value ◽  
Decay Products ◽  
Single Entry ◽  
Annual Inhalation Dose

In the present study, indoor radon and thoron concentrations were assessed using a newly developed pin hole-based twin cup dosimeter with a single-entry face in some areas of Punjab state, India. The equilibrium equivalent concentrations of radon and thoron were estimated directly by using the newly developed progeny (decay products) sensors designed by Bhabha Atomic Research Centre, Mumbai, India. The average radon and thoron concentrations in the study region were found to be 61.6 ± 18.6 Bq/m3 and 68.0 ± 30.8 Bq/m3, respectively, while the average equilibrium equivalent concentrations of radon and thoron were 25.9 ± 7.7 Bq/m3 and 2.2 ± 0.7 Bq/m3, respectively. Calculated average equilibrium factor for radon and thoron was 0.45 and 0.04, respectively, in the present study. The annual inhalation dose that was calculated from the present observed concentrations varied from 1.1 to 4.1 mSv/year with an average value of 2.4 mSv/year, which is well within the reference level of 10mSv/year recommended by International Commission on Radiological Protection. The study shows that thoron is a significant contributor to the inhalation dose, which is about 29% of the total inhalation dose.

Natural radiation exposure to the public in the uranium bearing region of Poli, Cameroon: From radioactivity measurements to external and inhalation dose assessment

2019 ◽  
Vol 205 ◽  
pp. 106350 ◽  
Author(s):  
Saïdou ◽  
Tokonami Shinji ◽  
Masahiro Hosoda ◽  
Tchuente Siaka Yvette Flore ◽  
Ndjana Nkoulou Joseph Emmanuel ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Dose Assessment ◽  
Natural Radiation ◽  
Inhalation Dose ◽  
The Public ◽  
Radioactivity Measurements

Indoor radon measurement and effective dose assessment of 150 apartments in Mashhad, Iran

2011 ◽  
Vol 184 (2) ◽  
pp. 1085-1088 ◽  
Author(s):  
Ali Asghar Mowlavi ◽  
Maria Rosa Fornasier ◽  
Ailreza Binesh ◽  
Mario de Denaro
Keyword(s):  
Effective Dose ◽  
Indoor Radon ◽  
Dose Assessment ◽  
Radon Measurement

scholarly journals Analysis of distributions of indoor radon concentrations in the regions of the Russian Federation

2019 ◽  
Vol 12 (1) ◽  
pp. 85-103 ◽  
Author(s):  
D. V. Kononenko
Keyword(s):  
Russian Federation ◽  
Lognormal Distribution ◽  
Indoor Radon ◽  
Dose Assessment ◽  
Arithmetic Means ◽  
Geometric Means ◽  
Normal Probability ◽  
The Russian Federation ◽  
Regions Of Russia ◽  
Radon Concentrations

During 2001–2017 more than 800 thousand records containing the results of measurements of radon concentration taken in 78 regions of Russia were accumulated in the Federal databank of radiation doses to the population of the Russian Federation. The paper presents the procedure and results of the first data analysis carried out to check the conformity of radon concentrations in the regions of Russia with the lognormal distribution and to calculate the parameters of these distributions. The procedure included verification and validation of data, plotting the frequency distribution histograms and Q-Q plots (normal probability plots) and the use of some methods of elimination of plateaus on the Q-Q plots and the distribution recovery. As a result, in 74 of 78 analyzed regions radon concentrations conform quite well or almost perfect to a lognormal distribution up to a certain level (this level ranged from 55 to 4915 Bq/m3). For all 78 regions geometric means with 95% confidence intervals, geometric standard deviations and arithmetic means were calculated. It should be noted that due to the fact that the Federal databank is a database containing results of measurements taken with different techniques (instant measurements, charcoal canisters, radon monitors and etched track detectors), the lognormal distributions for most regions are in fact contaminated distributions, and currently it is impossible to calculate the parameters of separate distributions that form the mixture. The results show that dose assessment based on arithmetic means could lead to an  overestimation of the doses from radon up to 2.1 times compared to that based on geometric means. The calculated medians can also be used for risk assessment purposes.

Indoor radon dose assessment for Osijek

1999 ◽  
Vol 44 (1) ◽  
pp. 97-106 ◽  
Author(s):  
J. Planinic ◽  
Z. Faj ◽  
V. Radolić ◽  
G. Šmit ◽  
D. Faj
Keyword(s):  
Indoor Radon ◽  
Dose Assessment

Radon/thoron and progeny levels in dwellings: Regional variations and effect of dwelling characteristics – A case study in Jalandhar district of Punjab, India

2017 ◽  
Vol 27 (5) ◽  
pp. 706-714 ◽  
Author(s):  
Manish Kumar ◽  
Anjali Kaushal ◽  
Amit Sarin ◽  
Rajesh Kumar ◽  
Navjeet Sharma
Keyword(s):  
Indoor Radon ◽  
Geometric Mean ◽  
Mean Value ◽  
Gamma Dose ◽  
Inhalation Dose ◽  
Human Environment ◽  
Single Entry ◽  
Thoron Progeny ◽  
Annual Inhalation Dose

An extensive survey to measure natural radioactivity in human environment in Jalandhar district of Punjab was undertaken. Results of measurements of indoor radon/thoron and their progeny concentrations are being presented here. Single-entry, pin-hole dosemeters were used for the measurement of radon/thoron concentrations. Deposition-based direct radon/thoron progeny sensors were used for measurement of progeny concentrations. The results have been analysed on the basis of regional characteristics, type of construction and building material used. The radon concentration was found to vary from 6.64 ± 1.72 Bq/m3 to 47.18 ± 4.43 Bq/m3 with geometric mean value of 17.9 ± 2.91 Bq/m3 while the thoron concentration varies from 7.75 ± 2.54 Bq/m3 to 82.68 ± 8.33 Bq/m3 with geometric mean value of 33.54 ± 5.09 Bq/m3. The geometric mean value of equilibrium factor for indoor radon and thoron was found to be 0.43 and 0.02, respectively. The estimated annual inhalation dose varies from 0.22 mSv to 1.76 mSv with geometric mean value of 0.66 mSv. Correlation of indoor radon and air gamma dose rate was also studied.

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