Thorough investigation of radon in a school with elevated levels

Vaupotič, Janja; Hunyadi, I.; Baradács, E.

doi:10.1016/s1350-4487(01)00210-4

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…The high indoor radon levels are associated with a number of factors including soil porosity, uranium content of the soil, building material, mode of construction, indoor air characteristics, wind speed, and ventilation conditions. The variability of these factors accounts for the large range of the radon levels measured in dwellings [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Indoor Radon Survey in 120 Schools Situated in Four Districts of the Punjab Province — Pakistan

Rahman

Matiullah

Anwar

et al. 2009

Indoor and Built Environment

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An indoor radon survey has been carried in 120 schools situated in four districts of the Punjab province, namely Attock, Chakwal, Jhelum, and Rawalpindi. In each season, a total of 360 CR-39-based radon detectors were installed in the selected schools. After exposure the detectors were etched in 6M NaOH at 80°C solution for 16 h and tracks densities, which are related to the radon concentration, were measured. Indoor radon concentration varied from 18 ± 7 to 168 ± 5 Bq·m-3 with an average value of 52 ± 9 Bq·m-3. High indoor radon concentration values were found in the summer season, whereas lower values were recorded in autumn season. The mean annual radon effective dose equivalent was estimated to be 0.49 mSv per year. Present indoor radon concentration values are higher than that of the world average value of 40 Bq·m-3, but lower than the action level recommended by the ICRP.

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Section: Introductionmentioning

confidence: 99%

Indoor Radon Survey in 120 Schools Situated in Four Districts of the Punjab Province — Pakistan

Rahman

Matiullah

Anwar

et al. 2009

Indoor and Built Environment

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“…Extensive data concerning national radon surveys in which CR-39 based radon detectors have been used are available in the literature [15][16][17][18][19][20][21][22][23]. This article deals with the measurement of indoor radon concentrations in 60 schools in the Rawalpindi region of Pakistan.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the dose received by students and staff in schools in the Rawalpindi region of Pakistan due to indoor radon

2009

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Studies concerning measurements of indoor radon levels were carried out in 60 schools in the Rawalpindi region of Pakistan. In each school, six CR-39 based NRPB type radon detectors were installed and exposed to the indoor radon in two cycles (each of six months' duration). After exposure, the detectors were removed, etched in 6 M NaOH for 16 h at 80 degrees C, and the tracks were counted under an optical microscope. The measured track densities were then related to radon concentrations, from which the radiation doses were calculated. The observed radon concentrations varied from 15 to 140 Bq m(-3), with an average activity concentration of 42.75 +/- 9.28 Bq m(-3). The mean annual radon effective dose equivalent was found to be 0.40 +/- 0.09 mSv using an occupancy factor of 8 h day(-1). Our results show that the indoor radon concentrations in the schools surveyed are within the permissible limits.

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“…where A Rn is the average volume activity of radon, in Bq/m 3 ; F = 0.5 is the equilibrium coefficient [4]; T is the time spent by the inhabitants or workers in the rooms during the year, in h; D is the dose factor equal to 9 nSv/(Bq·m -3 ·h) or 9·10 -6 mSv/(Bq·m -3 ·h) according to the latest ICRP data [5,6].…”

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Measurement of the volume activity of radon in uranium waste zones

et al. 2011

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The accumulation and behavior of radon in the home, school, preschool and other buildings during the summer and winter are investigated and an assessment is made of the dose load on the residents of the settlements located next to the uranium wastes. Methods of active and passive measurement of the volume activity of radon were used to accomplish this. The results of measurements of the radon activity in rooms are presented, the radon dose loads on the population are evaluated, and the radon-dangerous sections are indicated.A large quantity of radioactive tailings and wastes has been formed as a result of the production and reprocessing of uranium ores in the south-eastern Uzbekistan (Chatkalo-Kuraminskii ridge). These uranium wastes are the main radiationdestabilizing factor for the environment and the adjoining populated points. At present, they are under the jurisdiction of the local government agencies. In all objects, the portals to the mining wastes have been cemented; some portals have been recultivated. However, with time the neutral cover of the wastes breaks down as a result of natural factors and as a result of human activity (breakdown of stone and concrete barriers of the wastes and the use of radioactive wastes as building materials). The wastes and their materials are the main source of the increased volume activity in the surrounding outdoor and indoor air and pose a hazard to public health [1,2]. For this reason, it is important to study and develop methods for monitoring radon in the environment, determine the sources of air and their dose load on the public, and develop radiological-hygienic certification.The objectives of the present work are to investigate the accumulation and behavior of radon in homes, schools, preschool and other institutions during the summer and winter and to evaluate the dose load for the people living the settlements located next to uranium wastes. Modern methods of measuring the γ rays emitted in a medium and the volume activity of radon in the atmosphere at ground level and in populate points located near these wastes were used to attain these objectives. The research work was performed from 2006 to 2008 in the settlements of Yangiabal, Krasnogorsk, and Chorkesar with populations of 530, 10000, and 2060 people, respectively.The volume activity of the radon was measured by two methods -active and passive. The active method uses pumping, accumulation of air quickly in a closed volume, and passage of air through a filter followed by changing the activity of daughter products of decay or direct measurement of the activity of the 222 Rn which has been filtered out. Such measurements are convenient and helpful for studying radon concentration variations which occur during a relatively short period of time. The apparatus RRA-01M (Russia) and PRM-145 (Slovenia) were used for active measurements. The operation of RRA-01M is based on the detection of α-radiation 218 Po with electrostatic deposition of the ionized daughter products of radon decay on the surface of a semiconduct...

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Thorough investigation of radon in a school with elevated levels

Cited by 14 publications

References 4 publications

Indoor Radon Survey in 120 Schools Situated in Four Districts of the Punjab Province — Pakistan

Indoor Radon Survey in 120 Schools Situated in Four Districts of the Punjab Province — Pakistan

Assessment of the dose received by students and staff in schools in the Rawalpindi region of Pakistan due to indoor radon

Measurement of the volume activity of radon in uranium waste zones

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