scholarly journals A comparison of retrospective radon gas measurement techniques carried out in the Serbian spa of Niska Banja

2009 ◽  
Vol 24 (2) ◽  
pp. 94-99 ◽  
Author(s):  
Zora Zunic ◽  
Kevin Kelleher ◽  
Igor Celikovic ◽  
Predrag Ujic ◽  
Johan Paridaens ◽  
...  
Keyword(s):  
Indoor Radon ◽  
Measurement Techniques ◽  
Measurement Methods ◽  
Radon Progeny ◽  
Surface Trap ◽  
Radon Measurement ◽  
The Past ◽  
Radon Gas ◽  
Gas Measurement ◽  
The University

Indoor radon retrospective concentrations were obtained and compared using two radon measurement methods. Both methods rely on the measurement of the long-lived radon progeny 210Pb, collected either on the surfaces (surface trap technique), most frequently glass, or in a volume trap, usually sponge from furniture (volume trap technique). These techniques have been used to retrospectively estimate radon gas concentrations that have existed in dwellings in the past. The work presented here compares the results provided by the surface trap technique devised at the University College of Dublin, Ireland, and the volume trap technique devised at the Scientific Research Center, Mol, Belgium. The field campaign was carried out by the research team of the ECE Laboratory of the Vinca Institute of Nuclear Sciences at the spa of Niska Banja, identified as a region of Serbia with a high indoor radon and ground water radium and radon content.

scholarly journals Indoor radon measurement in residential/commercial buildings in Isfahan city

2019 ◽  
Author(s):  
Azad Mirbag ◽  
Afshin Shokati Poursani
Keyword(s):  
Radon Concentration ◽  
Urban Areas ◽  
Population Distribution ◽  
Indoor Radon ◽  
Commercial Buildings ◽  
World Health ◽  
Radon Measurement ◽  
Radon Gas ◽  
Significant Difference ◽  
The World

Introduction: People are constantly exposed to radiation from natural and artificial sources of radiation. Radon is one of the natural radiation sources that its concentration in very high in some part of the world. The presence of radon gas in the air can increase the risk of lung cancer. In this study, the level of indoor radon in dwellings of Isfahan city was surveyed. It should be mentioned that an active alpha GUARD instrument was used to measure radon concentration. All of the measurments took place during the winter and spring of 2018.   Materials and methods: In the present survey, 51 residential/commercial buildings were considered to radon gas monitoring based on the population distribution on 15 urban areas and the population of each area and technical possibilities. In each residential/commercial buildings, sampling was carried out at different floors of the building. A professional radon monitoring device (Alpha GUARD PQ2000 PRO) was used to measure indoor radon gas con-centration.   Results: The Results of measuring were shown that the radon concentration in the residential/commercial buildings varied from 3 to 251 Bq / m3, with a mean value of 28.57 ± 39.38 Bq / m3. The average annual effective dose re-ceived by the residents of the studied area was estimated to be 0.49 mSv. The results showed a significant difference between the average radon concentra-tion in different floors and the different ventilation of the building, higher values in the lower floors and weaker ventilation.   Conclusion: Indoor radon concentration in 4 % of the building was deter-mined to be higher than the limit (100 Bq / m3) recommended by the World Health Organization.

scholarly journals Comparison of indoor radon measurement methods

2021 ◽  
Author(s):  
Ivana Vukanac ◽  
Igor Čeliković ◽  
Gordana Pantelić ◽  
Miloš Živanović ◽  
Jelena Krneta Nikolić
Keyword(s):  
Indoor Radon ◽  
Measurement Methods ◽  
Radon Measurement

scholarly journals Comparison of passive and active radon measurement methods for personal occupational dose assessment

2016 ◽  
Vol 31 (1) ◽  
pp. 73-78
Author(s):  
Elham Hasanzadeh ◽  
Fereidoun Mianji ◽  
Asghar Sadighzadeh ◽  
Farhang Mizani
Keyword(s):  
Indoor Radon ◽  
Measurement Methods ◽  
Dose Assessment ◽  
Uranium Mine ◽  
Short Term ◽  
Radon Measurement ◽  
Active Method ◽  
Occupational Dose ◽  
Radon Concentrations

To compare the performance of the active short-term and passive long-term radon measurement methods, a study was carried out in several closed spaces, including a uranium mine in Iran. For the passive method, solid-state nuclear track detectors based on Lexan polycarbonate were utilized, for the active method, AlphaGUARD. The study focused on the correlation between the results obtained for estimating the average indoor radon concentrations and consequent personal occupational doses in various working places. The repeatability of each method was investigated, too. In addition, it was shown that the radon concentrations in different stations of the continually ventilated uranium mine were comparable to the ground floor laboratories or storage rooms (without continual ventilation) and lower than underground laboratories.

The ENEA Facilities for Assessing the Quality of Indoor Radon Measurements

1994 ◽  
Vol 56 (1-4) ◽  
pp. 303-307 ◽  
Author(s):  
G. Sciocchetti ◽  
G. Cotellessa ◽  
P. De Felice ◽  
P.G. Baldassini ◽  
M. Bovi ◽  
...  
Keyword(s):  
Building Materials ◽  
Dynamic Range ◽  
Indoor Radon ◽  
Measurement Techniques ◽  
Research Centre ◽  
Status Report ◽  
Radon Measurement ◽  
Research Activities ◽  
Experimental Facilities ◽  
Radon Measurements

Abstract A status report is given of the ENEA research activities on calibration and standardisation of radon measurement techniques. A description of radon standards and experimental facilities (the ENEA Radon Chamber and the 222Rn standard generator) developed at the Casaccia Research Centre is given. The experimental procedures to test the charcoal canister radon adsorption are described. The results of investigation of the response of passive plastic detectors (CR-39) at different exposure conditions at the ENEA radon chamber are discussed: dynamic range and accuracy of passive alpha track detectors in the range from 60 to about 7000 kBq.m-3.h radon exposure. Finally a brief description is given of the experimental facility that is under development to test instruments and methods that are used to measure the emanation/exhalation of radon gas from soils and building materials.

Novae in the Magellanic Clouds

1979 ◽  
Vol 46 ◽  
pp. 96-101
Author(s):  
J.A. Graham
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
University Of Michigan ◽  
The Past ◽  
Spectroscopic Information ◽  
Objective Prism ◽  
The University ◽  
Small Cloud ◽  
Low Dispersion

During the past several years, a systematic search for novae in the Magellanic Clouds has been carried out at Cerro Tololo Inter-American Observatory. The Curtis Schmidt telescope, on loan to CTIO from the University of Michigan is used to obtain plates every two weeks during the observing season. An objective prism is used on the telescope. This provides additional low-dispersion spectroscopic information when a nova is discovered. The plates cover an area of 5°x5°. One plate is sufficient to cover the Small Magellanic Cloud and four are taken of the Large Magellanic Cloud with an overlap so that the central bar is included on each plate. The methods used in the search have been described by Graham and Araya (1971). In the CTIO survey, 8 novae have been discovered in the Large Cloud but none in the Small Cloud. The survey was not carried out in 1974 or 1976. During 1974, one nova was discovered in the Small Cloud by MacConnell and Sanduleak (1974).

The consolidation of microscopy technology into a university research support facility: Reflections on the 1980's and projections for the 1990's at the university of iowa

1993 ◽  
Vol 51 ◽  
pp. 476-477
Author(s):  
Kenneth C. Moore
Keyword(s):  
Laser Scanning ◽  
Freeze Fracture ◽  
Freeze Substitution ◽  
Research Support ◽  
University Of Iowa ◽  
Staff Members ◽  
The Past ◽  
Research Grade ◽  
The University ◽  
Support Facility

The University of Iowa Central Electron Microscopy Research Facility(CEMRF) was established in 1981 to support all faculty, staff and students needing this technology. Initially the CEMRF was operated with one TEM, one SEM, three staff members and supported about 30 projects a year. During the past twelve years, the facility has replaced all instrumentation pre-dating 1981, and now includes 2 TEM's, 2 SEM's, 2 EDS systems, cryo-transfer specimen holders for both TEM and SEM, 2 parafin microtomes, 4 ultamicrotomes including cryoultramicrotomy, a Laser Scanning Confocal microscope, a research grade light microscope, an Ion Mill, film and print processing equipment, a rapid cryo-freezer, freeze substitution apparatus, a freeze-fracture/etching system, vacuum evaporators, sputter coaters, a plasma asher, and is currently evaluating scanning probe microscopes for acquisition. The facility presently consists of 10 staff members and supports over 150 projects annually from 44 departments in 5 Colleges and 10 industrial laboratories. One of the unique strengths of the CEMRF is that both Biomedical and Physical scientists use the facility.

The Tower Mill: An archaeological excavation of Queensland's oldest extant building

1996 ◽  
Vol 10 ◽  
pp. 1 ◽  
Author(s):  
Jay Hall ◽  
Jonathan Prangnell ◽  
Bruno David
Keyword(s):  
City Council ◽  
Archaeological Excavation ◽  
The Past ◽  
History Of ◽  
The University

The Tower Mill, Brisbane's oldest extant building, was excavated by the University of Queensland to determine for the Brisbane City Council the heritage potential of surrounding subsurface deposits.  Following the employment of GPR, excavation revealed interesting stratifications, features and artefacts.  Analysis permits an explanation for these deposits which augment an already fascinating history of the site's use over the past 170 years or so.

Effect of PM characterization on PM oxidative potential by acellular assays: a review

2020 ◽  
Vol 35 (4) ◽  
pp. 461-470
Author(s):  
Huibin Guo ◽  
Lei Jin ◽  
Sijing Huang
Keyword(s):  
Lung Cancer ◽  
Ascorbic Acid ◽  
Health Risks ◽  
Measurement Techniques ◽  
Measurement Methods ◽  
Redox Properties ◽  
Oxidative Potential ◽  
Cellular Assays ◽  
Copper Manganese ◽  
Risk Ratios

AbstractThe health risks brought by particles cannot be present via a sole parameter. Instead, the particulate matter oxidative potential (PM OP), which expresses combined redox properties of particles, is used as an integrated metric to assess associated hazards and particle-induced health effects. OP definition provides the capacity of PM toward target oxidation. The latest technologies of a cellular OP measurement has been growing in relevant studies. In this review, OP measurement techniques are focused on discussing along with PM characterization because of many related studies via OP measurements investigating relationship with human health. Many OP measurement methods, such as dithiothreitol (DTT), ascorbic acid (AA), glutathione (GSH) assay and other a cellular assays, are used to study the association between PM toxicity and PM characterization that make different responses, including PM components, size and sources. Briefly, AA and DTT assays are sensitive to metals (such as copper, manganese and iron etc.) and organics (quinones, VOCs and PAH). Measured OP have significant association with certain PM-related end points, for example, lung cancer, COPD and asthma. Literature has found that exposure to measured OP has higher risk ratios than sole PM mass, which may be containing the PM health-relevant fraction. PM characterization effect on health via OP measurement display a promising method.

History Teaching in Rural Areas: The University of Venda

1996 ◽  
Vol 24 (1) ◽  
pp. 17-23
Author(s):  
Alan Kirkaldy
Keyword(s):  
Rural Areas ◽  
Whole Body ◽  
Social Forces ◽  
Historical Writing ◽  
Social Formation ◽  
History Teaching ◽  
The Past ◽  
The Social ◽  
The University

I would argue that history students should understand that the whole body of historical writing consists of interpretations of the past. They should be able to analyse a wide variety of texts and form their own opinions on a historical topic, and should be able to construct a coherent argument, using evidence to support their opinion. In doing so, they should be actively aware that their argument is no more “true” than that offered by any other historian. It is as much a product of their personal biography and the social formation in which they live as of the evidence used in its construction. Even this evidence is the product of other personal biographies and other social forces.

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