Radionuclide Content of Building Materials and Gamma Ray Dose Rates in Dwellings of Rio Grande Do Norte, Brazil

1993 ◽  
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Rio Grande ◽  
Dose Rates ◽  
Radionuclide Content

scholarly journals A Research Study on the Radiological State of Building Material and the Risk Assessment

2020 ◽  
Vol 6 ◽  
pp. 313
Author(s):  
A. Savidou ◽  
C. Raptis ◽  
P. Kritidis
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Scintillation Counter ◽  
Natural Radionuclide ◽  
Radon Exhalation ◽  
Radionuclide Content ◽  
Flow Through ◽  
Materials Used ◽  
Lucas Cell ◽  
Continuous Accumulation

The objective of the present study is focused an the assessment of the radiological risk from building materials used in Attica region, Greece. Bricks and concrete com- monly used in Attica region have been studied for both natural radionuclide content and radon exhalation. The high-resolution gamma-ray spectroscopy technique, as well as radon exhalation measurements, have been employed. The technique used for the measurements of the radon exhalation is called "continuous accumulation- counting" method and has been described in detail by the authors in earlier pub- lications. This measurement technique is based on the continuous air flow through a sealed chamber containing the sample and through a scintillation counter (Lucas cell). The counting is continuous as well.

DISTRIBUTIONS OF INDOOR GAMMA DOSE RATES IN RELATION TO GAMMA-RAY EMISSIONS FROM BUILDING MATERIALS: CASE STUDY OF HIGH-RISE CONCRETE BUILDING IN FUKUSHIMA

2018 ◽  
Vol 184 (1) ◽  
pp. 116-126 ◽  
Author(s):  
Yasutaka Omori ◽  
Takuma Ishikawa ◽  
Atsuyuki Sorimachi ◽  
Tetsuo Ishikawa
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Natural Radionuclides ◽  
Gamma Dose ◽  
Minor Role ◽  
Dose Rates ◽  
High Rise ◽  
Gamma Dose Rates ◽  
Floor Slabs ◽  
Concrete Building

Abstract The spatial distribution of ambient gamma dose rates in a high-rise steel-reinforced concrete building in Fukushima, Japan, was examined relative to the gamma-ray emissions from building materials and radionuclides derived from the 2011 nuclear accident. The results revealed the minor role of accident-derived radionuclides in ambient gamma dose rates ~7 y after the accident. The ambient gamma dose rates were higher in the upper floors because of gamma-ray emissions from natural radionuclides in the floor slabs. The fractional contribution of natural radionuclides to the ambient gamma dose rates indicated compositional differences in concrete between the upper- and lower-floor slabs.

Radionuclide content of building materials and associated gamma dose rates in Egyptian dwellings

2000 ◽  
Vol 50 (3) ◽  
pp. 253-261 ◽  
Author(s):  
R.H. Higgy ◽  
M.S. El-Tahawy ◽  
A.T. Abdel-Fattah ◽  
U.A. Al-Akabawy
Keyword(s):  
Building Materials ◽  
Gamma Dose ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
Radionuclide Content

Making radioactivity measurements on building materials accessible to everyone

2020 ◽  
Author(s):  
Andrea Serafini ◽  
Matteo Alberi ◽  
Pierluigi Carconi ◽  
Enrico Chiarelli ◽  
Pierino De Felice ◽  
...  
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Natural Radionuclides ◽  
Automated System ◽  
Energy Calibration ◽  
Safety Standards ◽  
Dose Rates ◽  
Autonomous Operation ◽  
Stone Materials ◽  
Peak Recognition

<p>The CORSAIR (Cloud Oriented Radiation Sensor for Advanced Investigation of Rocks) project was born to meet the EU guidelines 2013/59/EURATOM on safety standards for protection against ionizing radiations. The project designed an automated system capable of providing a real-time measurement of the radioactive activity concentration index for building materials according to regulations of more than 20 different countries. Measurements are conducted through in situ gamma-ray spectroscopy techniques on 3 x 3 x 3 m<sup>3</sup> blocks of rock at quarries and processing centers, and quantify the activities, the abundances and the related effective dose-rates of natural radionuclides (<sup>40</sup>K, <sup>232</sup>Th, <sup>238</sup>U and their progenies) in stone materials for the building industry. The detector comprises a 2” x 2” cylindric CeBr<sub>3</sub> crystal having a 2.5% energy resolution at 1461 keV. A lateral lead shield of 1.3 cm enables a ~60% reduction of the gamma signal coming from above and beside the detector. The system is designed for providing the radiometric index in less than 30 min with an overall uncertainty of the order of 5%.</p><p>The innovative aspects of the detector are in its autonomous operation and the easy fruition of the results of the material characterization. Energy calibration and peak recognition are automatically performed on‑board through an innovative stochastic method based on simulated annealing. The computation of the results is fully-automated and requires no intervention of the operator. The battery-powered detector is equipped with GPS, LoRa, Bluetooth and Wi-Fi connectivity and can be remotely controlled thanks to a dedicated Android app. Acquired data and activity indexes are synced through LoRa connectivity to a cloud database, where they can be easily accessed by sellers and buyers, thus preventing the placing on the market of blocks hazardous to public health.</p>

RADIATION EXPOSURE FROM NATURAL RADIONUCLIDES IN BUILDING MATERIALS

2018 ◽  
Vol 185 (1) ◽  
pp. 49-57 ◽  
Author(s):  
M J Madruga ◽  
C Miró ◽  
M Reis ◽  
L Silva
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Health Hazard ◽  
Natural Radionuclides ◽  
Mean Value ◽  
Radium Equivalent Activity ◽  
Dose Rates ◽  
Radium Equivalent ◽  
Radiological Health ◽  
Hazard Parameters

Abstract Building materials from Iberian Peninsula (Portugal and Spain) were collected and analysed for 226Ra, 232Th and 40K using HPGe gamma-ray spectrometers. The results show that the highest mean value of 226Ra and 232Th activities are 2168 and 390 Bq kg−1, respectively, measured in zircon. For 40K, this value is 1290 Bq kg−1, measured in granite. The mean concentrations of the three radionuclides in the different building materials, excluding the zircon and the industrial by-products (ashes, gypsum and phosphogypsum), are 62, 31 and 519 Bq kg−1 for 226Ra, 232Th and 40K, respectively. The radiological health hazard parameters: radium equivalent activity (Raeq), activity concentration index (I) absorbed and effective dose rates, associated with these radionuclides, were evaluated. These values are within the EU recommended limits in building materials, except for same samples of aggregates, granites, ceramics, phosphogypsum and zircon. This study will contribute for the worldwide data pooling on the radioactivity of the building materials.

scholarly journals Gamma Ray Spectrometric Analysis of Sand Samples from Selected Beaches along Kenyan Coastline

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Willis Otieno Gor Odongo ◽  
Nadir Hashim ◽  
Margaret Wairimu Chege
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Hazard Index ◽  
Spectrometric Analysis ◽  
Dose Rates ◽  
Gamma Ray Spectrometer ◽  
Activity Concentrations ◽  
Radium Equivalent ◽  
Average Activity ◽  
Radiological Health

In this study, the activity concentration levels of 238U, 232Th, and 40K in sand samples collected from Shanzu, Nyali, Kenyatta, Tiwi, Shelly, and Diani beaches selected along the Kenyan coastline were determined using a gamma ray spectrometer with a NaI(Tl) detector. The average activity concentrations of 238U, 232Th, and 40K in sand samples were analyzed as 87 ± 4, 98 ± 4, and 1254 ± 62 Bq/kg, respectively. Also, radium equivalent (Raeq) activity and internal (Hin) and external (Hex) hazard index were calculated to assess the radiological hazards associated with the use of sand samples as building materials. The average values of Raeq, Hin, and Hex were found as 327 ± 16 Bq/kg, 0.98, and 0.72, respectively. The average values of outdoor and indoor annual effective dose rates were estimated as of 0.23 and 0.63 mSv/y, respectively, which are below maximum recommended limit of 1 mSv/y. Generally, these results indicate no significant radiological health hazards for the studied beaches.

scholarly journals Modelling the bimodal distribution of indoor gamma-ray dose-rates in Great Britain

2018 ◽  
Vol 57 (4) ◽  
pp. 321-347 ◽  
Author(s):  
G. M. Kendall ◽  
P. Chernyavskiy ◽  
J. D. Appleton ◽  
J. C. H. Miles ◽  
R. Wakeford ◽  
...  
Keyword(s):  
Great Britain ◽  
Gamma Ray ◽  
Bimodal Distribution ◽  
Dose Rates

Natural radioactivity in some building materials and assessment of the associated radiation hazards

2018 ◽  
Vol 106 (1) ◽  
pp. 79-86
Author(s):  
Amira Kasumović ◽  
Ema Hankić ◽  
Amela Kasić ◽  
Feriz Adrović
Keyword(s):  
Building Materials ◽  
Gamma Ray ◽  
Absorbed Dose ◽  
Absorbed Dose Rate ◽  
Radium Equivalent Activity ◽  
Radiation Hazards ◽  
Eu Member States ◽  
Gamma Ray Spectrometer ◽  
Radioactive Nuclides ◽  
Specific Activities

AbstractThe results of the specific activities of232Th,226Ra and40K measured in samples of commonly used building materials in Bosnia and Herzegovina are presented. Measurements were performed by gamma-ray spectrometer with coaxial HPGe detector. The surface radon exhalation and mass exhalation rates for selected building materials were also measured. The determined values of specific activities were in range from 3.16±0.81 Bq kg−1to 64.79±6.16 Bq kg−1for232Th, from 2.46±0.95 Bq kg−1to 53.89 ±3.67 Bq kg−1for226Ra and from 28.44±7.28 Bq kg−1to 557.30±93.38 Bq kg−1for40K. The radium equivalent activity, the activity concentration index, the external and internal hazard indices as well as the absorbed dose rate in indoor air and the corresponding annual effective dose, due to gamma-ray emission from the radioactive nuclides in the building material, were evaluated in order to assess the radiation hazards for people. The measured specific activities of the natural radioactive nuclides in all investigated building materials were compared with the published results for building materials from other European countries. It can be noted that the results from this study are similar to the data for building materials from neighbouring countries and for building materials used in the EU Member States. The radiological hazard parameters of the building materials were all within the recommended limits for safety use.

scholarly journals TL, OSL and C-14 dating results of the sediments and bricks from mummified nuns' grave

2012 ◽  
Vol 84 (2) ◽  
pp. 237-244 ◽  
Author(s):  
Diego R.G. Tudela ◽  
Sonia H. Tatumi ◽  
Márcio Yee ◽  
Silvio L.M. Brito ◽  
José L. Morais ◽  
...  
Keyword(s):  
Eighteenth Century ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Gamma Ray ◽  
The State ◽  
Osl Dating ◽  
Annual Dose ◽  
Dose Rates ◽  
Gamma Ray Spectroscopy

This paper presents the results of TL and OSL dating of soil and fragments of bricks from a grave, which was occupied by two mummified nuns, found at "Luz" Monastery, located in the state of São Paulo, Brazil. The TL and OSL ages were compared to C-14 dating ones obtained from bone collagens of the mummies. The majority of the ages is related to the eighteenth century. The gamma-ray spectroscopy was used to evaluate natural radioisotope concentrations in the samples, and by using these concentrations the annual dose rates, from 3.0 to 5.3 Gy/kyr, were obtained. Neutron activation analysis was performed and the radioisotope contents results are in agreement with those obtained by gamma-ray spectroscopy. The contents of U, Th and Ce elements were higher than those found in usual sediments.

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