scholarly journals Measurement of indoor radon concentration and actual effective dose estimation of schools at high radon area in Korea

2011 ◽  
Vol 46 (6) ◽  
pp. S91-S91 ◽  
Author(s):  
B.U. Chang ◽  
Y.J. Kim ◽  
M.H. Song ◽  
G.H. Kim ◽  
S.Y. Jeong ◽  
...  
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Indoor Radon ◽  
Dose Estimation ◽  
Indoor Radon Concentration

The Alpha Particle Doses Received by Students and Staff in Twenty Schools in the North of Hebron Region - Palestine

2021 ◽  
Vol 14 (4) ◽  
pp. 309-316
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Alpha Particles ◽  
Indoor Radon Concentration ◽  
The North ◽  
Cr 39 Detectors ◽  
Average Effective Dose ◽  
Radon Concentrations

Abstract: The aim of the current study was to measure indoor radon concentration levels and its resulting doses received by the students and staff in schools of the directorate of education in the north of Hebron region- Palestine, during the summer months from June to September (2018), using CR-39 detectors. In this study, a total of 567 CR-39-based radon detectors were installed in the selected schools. The average radon concentrations were found to be 90.0, 66.5 and 58.0 Bqm-3 in Halhul, Beit Umar and Alarrub camp schools, respectively. Based on the measured indoor radon data, the overall average effective dose for the studied area was found to be 0.31 mSvy-1. Reported values for radon concentrations and corresponding doses are lower than ICRP recommended limits for workplaces. The results show no significant radiological risk for the pupils and staff in the schools under investigation. Consequently, the health hazards related to radiation are expected to be negligible. Keywords: Radon concentration, Alpha particles, Annual effective dose, Schools. PACs: 29.40.−n.

INDOOR RADON CONCENTRATION AND RISK ASSESSMENT IN SOME DWELLINGS OF OBUASI, MINING TOWN

2019 ◽  
Vol 188 (1) ◽  
pp. 30-37
Author(s):  
Irene Opoku-Ntim ◽  
Aba Bentil Andam ◽  
Vicenzo Roca ◽  
J J Fletcher ◽  
T T Akiti
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Rainy Season ◽  
Building Materials ◽  
Indoor Radon ◽  
Dry Season ◽  
Indoor Radon Concentration ◽  
Mining Town ◽  
222Rn Concentration ◽  
Materials Used

Abstract 222Rn concentration indoors was measured in 40 dwellings in the Obuasi municipality, a gold-mining town in the Ashanti Region of Ghana using the LR 115 type II strippable detectors for the two major seasons in Ghana, rainy and dry. The detectors were placed in the bed rooms of dwellers for 6 months each. Average indoor radon concentration varied from 63.9 to 364.9 Bqm−3 with a mean of 152.2 ± 10.9 Bqm−3 in the rainy season and 26.1–119.0 Bqm−3 with a mean of 50.5 ± 3.9 Bqm−3 in the dry season. The effective dose of 3.90 ± 0.3 mSvy−1 for the rainy season and for the dry season, effective dose of 0.6 mSvy−1 were recorded. The seasonal variation of 222Rn concentration indoors showed higher values in the rainy season than the dry season. A dependence was observed between the type of building materials used in building and the indoor radon level.

Indoor Radon Levels and Annual Effective Dose in Dwellings of Najran City, Saudi Arabia

2018 ◽  
Vol 786 ◽  
pp. 393-399
Author(s):  
Heba M. Badran
Keyword(s):  
Saudi Arabia ◽  
Effective Dose ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Health Hazard ◽  
Indoor Radon Concentration ◽  
Study Region ◽  
Radon Measurements ◽  
The City

The main objective of this study is to assess the health hazard due to the indoor radon. CR-39 as time-integrated passive solid-state nuclear track detectors (SSNTDs) were used in the indoor radon measurements of Najran City, Saudi Arabia. CR-39 detectors were distributed in dwellings of different places of the city. The detectors were exposed in the dwellings for two months and then etched in NaOH 6.25 N solution at 70 ±1°C for 5 h. This study revealed that the radon concentration in the dwellings ranged from 15.03±1.9 to 70.48±3.3 Bq m-3 with an average of 34.00±14.0 Bq m-3. Comparison of indoor radon concentration measurements in the different floors showed that the radon concentration in ground floors was slightly higher than that in first floors. Results showed that there is no significant health risk from indoor radon concentration and annual effective dose in the study region.

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 A study of indoor radon levels and radon effective dose in dwellings of some cities of Gezira State in Sudan

2014 ◽  
Vol 29 (4) ◽  
pp. 307-312 ◽  
Author(s):  
Abd-Elmoniem Elzain
Keyword(s):  
Lung Cancer ◽  
Effective Dose ◽  
Dose Rate ◽  
Radon Concentration ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
Indoor Radon Concentration ◽  
Energy Agency ◽  
Effective Dose Rate ◽  
Annual Effective Dose Rate

Exposure to natural sources of radiation, especially 222Rn and its short-lived daughter products has become an important issue throughout the world because sustained exposure of humans to indoor radon may cause lung cancer. The indoor radon concentration level and radon effective dose rate were carried out in the dwellings of Medani, El Hosh, Elmanagil, Haj Abd Allah, and Wad Almahi cities, Gezira State - Central Sudan, in 393 measurements, using passive integrated solid-state nuclear track devices containing allyl diglycol carbonate plastic detectors. The radon concentration in the corresponding dwellings was found to vary from (57 ? 8) Bq/m3 in Medani to 41 ? 9 Bq/m3 in Wad Almahi, with an average of 49 ? 10 Bq/m3. Assuming an indoor occupancy factor of 0.8 and 0.4 for the equilibrium factor of radon indoors, we found that the annual effective dose rate from 222Rn in the studied dwellings ranges from 1.05 to 1.43 mSv per year and the relative lung cancer risk for radon exposure was 1.044%. In this research, we also correlated the relationship of radon concentration and building age. From our study, it is clear that the annual effective dose rate is larger than the ?normal? background level as quoted by UNSCEAR, lower than the recommended action level of ICRP, and less than the maximum permissible dose defined by the International Atomic Energy Agency.

Assessment of Annual Tracheobronchial Effective Dose from Indoor Radon Inhalation in Selected Residential Buildings in Southwestern Nigeria

2021 ◽  
Vol 11 (6) ◽  
pp. 79-88
Author(s):  
Olukunle Olaonipekun Oladapo ◽  
Olatunde Micheal Oni ◽  
Emmanuel Abiodun Oni
Keyword(s):  
Effective Dose ◽  
Radon Concentration ◽  
Residential Buildings ◽  
Indoor Radon ◽  
World Health ◽  
Reference Level ◽  
Indoor Radon Concentration ◽  
Effective Doses ◽  
The Mean ◽  
Radon Inhalation

Background and Purpose: Radon-222 is a major human health challenge among all sources of ionizing radiation. For most people, the greatest exposure to radon comes from homes and affects mainly the respiratory tract, especially the tracheobronchial region. This work assesses the annual tracheobronchial effective dose from indoor radon inhalation in residential buildings with different covering materials for walls, ceilings and floor using different dosimetric lung models. Method: A total of 180 residential buildings with commonest combination of covering materials in some cities in South-western Nigeria were investigated using an active electronic radon gas detector, RAD 7. The commonest combination of covering materials were (A): paint, paint, carpet; (B): paint fiber board, plastic tiles; (C): paint, fiber board, ceramic tiles for walls, ceilings and floors respectively. Result: The mean indoor radon concentration measured ranged between 23.08 Bq m-3 and 72.14 Bq m-3 for all the residential buildings investigated. Buildings with covering materials C, presented the highest radon concentration. Generally, the mean indoor radon concentration for all combinations of covering materials in all the cities investigated were found to be lower than the recommended action level of 200 Bqm-3 and the reference level of 100 Bqm-3 set by International Commission on for Radiation Protection and World Health Organization respectively. The annual tracheobronchial effective dose estimated for the different lung dose models ranged from 0.91 mSv – 3.27 mSv for combination (A), 1.00 mSv - 3.60 mSv for combination (B) and 1.09 mSv – 3.94 mSv for combination (C). It revealed that the more recent model gives greater value of the annual tracheobronchial effective dose. It was observed that only the annual tracheobronchial effective doses obtained by the James model presented values that are within the recommended ICRP intervention level of (3-10) mSvy-1. Other models gave values of annual tracheobronchial effective doses below the ICRP recommended intervention levels. Conclusion: These imply that all the residential buildings and the different combination of covering materials surveyed in this work will not pose any radiological hazard to the inhabitants. Key words: Indoor Radon Inhalation, Radon-222, annual tracheobronchial effective dose, residential buildings

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