GAMMA DOSE RATES IN THE HIGH BACKGROUND RADIATION AREA OF MANGALORE REGION, INDIA

2019 ◽  
Vol 184 (3-4) ◽  
pp. 290-293 ◽  
Author(s):  
Darwish Al-Azmi ◽  
Sudeep Kumara ◽  
M P Mohan ◽  
N Karunakara
Keyword(s):  
Gamma Ray ◽  
Background Radiation ◽  
Gamma Dose ◽  
Natural Background ◽  
High Background ◽  
Natural Background Radiation ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
High Background Radiation Area ◽  
Normal Background

Abstract Elevated levels of natural background radiation due to scattered patches of monazite sand around the beaches of Mangalore, India, have been reported earlier. A comparative study of gamma dose rates was performed in both normal background and high natural background radiation areas around Mangalore using different types of portable gamma dosimeters. In addition to this, gamma-ray energy spectra were acquired, in situ, using a NaI(Tl) based portable gamma spectrometer. Soil and sand samples were collected for laboratory analysis with HPGe detectors. Measurements were carried out during the years 2016–18 revealed that in majority of the locations the gamma dose rates were similar to the normal background regions, whereas, in certain locations the dose rates were higher with values up to 530 nSv/h.

scholarly journals Indoor gamma dose rates in the high background radiation area of Abeokuta, South Western Nigeria

2019 ◽  
Vol 12 (1) ◽  
pp. 72-77
Author(s):  
I. C. Okeyode ◽  
I. C. Oladotun ◽  
O. O. Alatise ◽  
B. S. Bada ◽  
V. Makinde ◽  
...  
Keyword(s):  
Background Radiation ◽  
Gamma Dose ◽  
High Background ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
High Background Radiation Area ◽  
Radiation Area

AT HIGH BACKGROUND RADIATION AREAS THE RELATIONSHIP BETWEEN IN SITU INDOOR GAMMA DOSE RATES AND BUILDING MATERIALS: A CASE STUDY FROM ARIKLI VILLAGE (AYVACIK/ÇANAKKALE/TURKEY)

2020 ◽  
Vol 188 (2) ◽  
pp. 246-260
Author(s):  
Gülcan Top ◽  
Yüksel Örgün ◽  
Gürsel Karahan ◽  
Orkan Özcan ◽  
Mark Horvath ◽  
...  
Keyword(s):  
Building Materials ◽  
Background Radiation ◽  
Gamma Dose ◽  
High Background ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
Uranium Mineralisation ◽  
Radiological Health

Abstract This study measured in situ indoor gamma dose rates in Arıklı village situated near a uranium mineralisation region, evaluated the risks of radiological health hazards and established a hypothetical relationship between these values and building materials using statistical tools. Eberline brand portable type ESP-2 model Na (I) scintillation probe connected detector was used for the measurements in 45 dwellings. Statistics revealed two groups. The first group consists of the dwellings made of bricks or mixed materials both plastered by cement, while the second group represented the dwellings made of Arıklı tuff plastered with soil (modified Arıklı tuff) or cement. For the first and second groups, respectively, the medians of the indoor gamma dose rates were 188.79 and 261.87 nGy/h; for indoor Annual Effective Dose Equivalents (AEDEin) they were 0.93 and 1.28 mSv/h; and for Excess Lifetime Cancer Risks (ELCRin) they were 3.69 and 5.12, respectively. All the values were higher than those of the world averages.

scholarly journals Natural Radioactivity in Some Building Materials Originating from a High Background Radiation Area

2014 ◽  
Vol 2 (6) ◽  
pp. 70-78
Author(s):  
Kinsara A.A ◽  
Shabana E.I ◽  
Qutub M.M.T
Keyword(s):  
Building Materials ◽  
Background Radiation ◽  
Natural Background ◽  
Hazard Indices ◽  
High Background ◽  
Activity Concentrations ◽  
Metavolcanic Rocks ◽  
High Background Radiation Area ◽  
Radiation Area ◽  
Radioactivity Levels

Twenty four samples of building materials, collected from utilized quarries dispersed randomly in a high natural background radiation area, were analyzed for 226Ra, 232Th and 40K by γ-spectrometry. This area lies in Hail province, Saudi Arabia. The collected samples were fragmented granites, granite gravels with clays, sands and crushed black rocks (mafic metavolcanic rocks). The results showed that the highest activity concentrations were found in the fragmented granite materials and ranged from 144-207, 671-1058 and 964-1440 Bq/kg with average values of 194, 912 and 1320 Bq/kg for 226Ra, 232Th and 40K, respectively. The lowest activity concentrations were found in the black rock materials which ranged from 19-39, 47-125 and 212-306 Bq/kg with average values of 24, 82 and 255 Bq/kg for 226Ra, 232Th and 40K, respectively. The radioactivity levels in the other materials lie somewhere in between. Granites and clays exceeded the proposed hazard indices for the usage as building materials and should be restricted, whereas the sands and the crushed black rocks complied with these indices and can be used without restrictions.

scholarly journals Is Induction of Anomalies in Lymphocytes of the Residents of High Background Radiation Areas Associated with Increased Cancer Risk?

2019 ◽  
Vol 9 (3Jun) ◽  
Author(s):  
S M J Mortazavi ◽  
Gh Mortazavi ◽  
S A R Mortazavi ◽  
M Paknahad
Keyword(s):  
Cancer Risk ◽  
Background Radiation ◽  
Biological Effects ◽  
Chromosomal Anomalies ◽  
Natural Background ◽  
Natural Radiation ◽  
High Background ◽  
Natural Background Radiation ◽  
Significant Difference ◽  
The World

Man has been exposed to different levels of natural background radiation since the creation of human life. There are inhabited areas around the world with extraordinary levels of natural background radiation. The level of natural radiation in these areas is up to two orders of magnitude higher than other places. Areas such as Yangjiang, China; Guarapari, Brazil; and Kerala, India are among the areas with high levels of natural radiation. Ramsar a coastal city in North Iran has some inhabited areas with the highest known levels of background radiation around the world. People who live in high background radiation areas (HBRAs) such as Ramsar do not record any detrimental biological effects. While some cytogenetic studies conducted in HBRAs have shown increased frequencies of unstable chromosome aberration, other investigations failed to find a significant difference. This short review is an attempt to verify if induction of chromosomal anomalies in the lymphocytes of the residents of high background radiation areas is associated with increased cancer risk.

ELEVATION OF GAMMA DOSE RATE BY CONSTRUCTION OF THE ASIAN HIGHWAY 3 (AH3) BETWEEN ULAANBAATAR AND SAINSHAND, MONGOLIA

2018 ◽  
Vol 184 (1) ◽  
pp. 127-134 ◽  
Author(s):  
Yasutaka Omori ◽  
Atsuyuki Sorimachi ◽  
Manlaijav Gun-Aajav ◽  
Nyamdavaa Enkhgerel ◽  
Galnemekh Oyunbolor ◽  
...  
Keyword(s):  
Dose Rate ◽  
Gamma Ray ◽  
Natural Radionuclides ◽  
Pulse Height ◽  
Gamma Dose ◽  
Gamma Dose Rate ◽  
Radiation Level ◽  
Dose Rates ◽  
Gamma Dose Rates ◽  
Road Materials

Abstract The present study aimed at examining changes of gamma radiation level associated with road construction in Mongolia. A car-borne survey of gamma dose rate was made for a paved, ~450-km long part of the Asian Highway 3 between Ulaanbaatar and Sainshand. The gamma dose rates ranged from 48 to 173 nGy/h. Elevation of the gamma dose rates was observed only on a 86-km long segment of the survey route which was newly constructed from 2011 to 2013. The gamma dose rates over the newer paved segment were twice as high as those over the bare dirt surface alongside it. Outdoor measurements of gamma-ray pulse height distributions also indicated an abundance of natural radionuclides, especially 232Th-series elements in road materials. These findings suggest that the gamma dose rates were elevated by introduction of road materials containing large amounts of natural radionuclides.

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.

scholarly journals Study of natural background radiation in Kathmandu Valley

BIBECHANA ◽  
2018 ◽  
Vol 16 ◽  
pp. 187-195
Author(s):  
Parkash Pantha ◽  
Tanka Prasad Bhusal ◽  
Budha Ram Shah ◽  
Rajendra Prasad Koirala
Keyword(s):  
Effective Dose ◽  
Dose Rate ◽  
Background Radiation ◽  
Annual Effective Dose ◽  
Kathmandu Valley ◽  
Radiological Protection ◽  
Average Dose ◽  
Natural Background ◽  
Natural Background Radiation ◽  
Dose Rates

The study of natural background radiation dose at thirty two locations of Kathmandu valley has been done successfully using the instrument Radalert 100. The average dose rates and annual effective dose were measured. From the measurements, the least value of average dose rate was found to be (22.3±3.9)×10-3 mR/hr for Sundhara and the greatest value of average dose rate was  found to be (37.7±7)×10-3 mR/hr for Budhanilkantha 3.  As per the annual effective dose, the least value was 0.391 mSv/yr for Sundhara and the greatest value was 0.661 mSv/yr for Budhanilkantha 3. The average annual effective dose of Kathmandu valley was 0.475 mSv/yr ranging from 0.391 mSv/yr to 0.661 mSv/yr. The values thus obtained were compared to the worldwide average value of annual effective dose, 0.48 mSv/yr. Also, the obtained values were compared to the legal dose limit (annual effective dose), 1 mSv/yr set by International Commission on Radiological Protection (ICRP) for non-radiation workers and members of public. Among these thirty two locations, eight locations were chosen such that they had larger range of the observed dose rates. Those eight locations were re-observed. Further, Chi-square test was carried out to test whether the observed dose rates were following normal distribution or not. From the calculation, it was observed that the observed dose rates were following the normal distribution.BIBECHANA 16 (2019) 187-195

Radioactivity of building materials in Mahallat, Iran – an area exposed to a high level of natural background radiation – attenuation of external radiation doses

2020 ◽  
Vol 70 (340) ◽  
pp. 233 ◽  
Author(s):  
A. Shahrokhi ◽  
M. Adelikhah ◽  
S. Chalupnik ◽  
E. Kocsis ◽  
E. Toth-Bodrogi ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Building Materials ◽  
Background Radiation ◽  
Radiation Doses ◽  
Natural Background ◽  
Natural Background Radiation ◽  
Dose Rates ◽  
Mass Activity ◽  
High Level ◽  
The Town

In this study, mass activity of naturally occurring radioactive materials were measured in twenty-three building material samples, use extensively in the area exposed to a high level of natural background radiation (Mahallat, Iran), to determine the radioactivity index and changes to the level of indoor gamma radiation. The mass activity of 232Th, 226Ra and 40K were within the ranges from 18 ± 3 to 44 ± 10 Bq/kg (average of 27 ± 6 Bq/kg), 22 ± 5 to 53 ± 14 Bq/kg (average of 34 ± 6 Bq/kg) and 82 ± 18 to 428 ± 79 Bq/kg (average of 276 ± 58 Bq/kg), respectively. The gamma dose rates for population were estimated between 48 ± 9 and 111 ± 26 nGy/h with exception of radon exhalation from building materials. Since the air kerma rate in the town varies from 0.8 to 4 μGy/h, the attenuation coefficient was calculated for buildings made of the aforementioned materials. Additionally, the annual gamma radiation doses for inhabitants were calculated based on time spent outdoors and indoors.

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