scholarly journals Assessment of Beach sand using Gamma Ray Spectrometer in Thiruvanathapuram District, Kerala of South India

2016 ◽  
Vol 5 (3) ◽  
pp. 56 ◽  
Author(s):  
Ajithra Abinesh ◽  
Shanthi G.
Keyword(s):  
Tamil Nadu ◽  
Gamma Ray ◽  
Background Radiation ◽  
Beach Sand ◽  
Hazard Indices ◽  
Air Exposure ◽  
High Background ◽  
Activity Concentrations ◽  
The World ◽  
The Waves

<div><p><em>It is well recognized fact that some areas of the world have anomalously high levels of natural background radiation referred to as high background radiation areas (HBRAs).  Typical examples include Yangjiang in China, Rasmar in Iran and In India, part of coastal areas of Kerala and Tamil Nadu fall in this category.  It has been established earlier that the cause for this high background is the presence of monazite (thorium). This study focuses on the estimation of the environmental radioactivity levels in the beach sands of </em><em>Thiruvanathapuram district, Kerala. </em><em> </em></p></div><p><em>Using high resolution gamma ray spectroscopy activity concentrations of <sup>40</sup>K, <sup>238</sup>U &amp; <sup>232</sup>Th were estimated. Activity concentrations ranged from 17-154 Bq/kg for <sup>40</sup>K, from 4 to 100 Bq/kg for <sup>238</sup>U and from 6 to 296 Bq/kg for <sup>232</sup>Th.The mean activity concentration values obtained for the radionuclide are below than the world average values reported by the UNSCEAR. Subsequently assessed radiological effects show that the mean radium equivalent activity is 65 Bq/kg. The range of the calculated air exposure rate was between 14.2 to 228.1 nGy/h in both 0 m from the Waves and 10 m from the Waves. The values of external and internal radiation hazard indices are found to be less than unity. Measured natural radioactivity, hazard indices and effective dose received by the population were found to within the recommended limits. This work provides a good baseline data of natural radioactive elements for the sand of the area and  its radiological significance. </em></p>

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.

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.

ASSESSMENT OF INDOOR RADIATION DOSE RECEIVED BY THE RESIDENTS OF NATURAL HIGH BACKGROUND RADIATION AREAS OF COASTAL VILLAGES OF KANYAKUMARI DISTRICT, TAMIL NADU, INDIA

2015 ◽  
Vol 1 (01) ◽  
pp. 01-05
Author(s):  
R.Ragel Mabel Saroja
Keyword(s):  
Solid State ◽  
Radiation Dose ◽  
Gamma Radiation ◽  
Radiation Exposure ◽  
Effective Dose ◽  
Tamil Nadu ◽  
Background Radiation ◽  
Annual Effective Dose ◽  
Indoor Radon ◽  
High Background

Radiation exposure and effective dose received through two routes of exposure, viz. external and internal, via inhalation, by residents of coastal villages belonging to Natural High Background Radiation Areas (NHBRA) of Kanyakumari District and Tamil Nadu inIndiawere studied. While the indoor gamma radiation levels were monitored using Thermo Luminescent Dosimeters (TLDs), the indoor radon and thoron gas concentrations were measured using twin chamber dosimeters employing Solid State Nuclear Track Detectors (SSNTDs, LR-115-II). The average total annual effective dose was estimated and found to be varied from 2.37 to8.64 mSv.

scholarly journals ESTIMATION ON THE RADIOLOGICAL LEVEL OF NATURAL OCCURRING RADIONUCLIDES PRESENT IN FLOODED SOIL SAMPLES IN KADUNA NORTH, NIGERIA

2017 ◽  
Vol 5 (10) ◽  
pp. 81-91
Author(s):  
P.M. Gyuk ◽  
J.O. Anaegbu ◽  
H.O. Aboh ◽  
R. Daniel ◽  
A. Aruwa ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Background Radiation ◽  
Absorbed Dose ◽  
Soil Samples ◽  
Gamma Ray Spectrometry ◽  
Published Data ◽  
Absorbed Dose Rate ◽  
Radium Equivalent Activity ◽  
Activity Concentrations ◽  
Radium Equivalent

The background radiation of the areas was collected at random for each point using a rados survey meter. The detectors (two rados survey meter were used) were placed 1 meter above the ground with the operator positioned a few meters away. Three (3) readings were taking from each detector in other to reduce error or reach accuracy in obtaining the background readings from each randomly selected point where soil samples were later collected. In the current study, the concentration levels of naturally occurring radioactive materials (NORMs) of 40K, 232Th, and 238U in the surface soil samples of selected areas in kigo road new extension Kaduna north, Kaduna in Nigeria were studied. The collected soil samples were analyzed by means of gamma-ray spectrometry. The mean activity concentrations of the natural occurring radionuclides of  226Ra, 232Th and 40K in the soil samples were estimated to be 62, 78.35, 227.17 Bq/kg respectively for kigo road new extension respectively. Radium equivalent activity, absorbed dose rate, annual effective dose equivalent were also calculated for assessment of radiological risk. External hazard value (Hex) is between 0.3163 and 0.9557 and Internal hazard value is between 0.4462 and 1.1618. The worldwide average activity concentrations of 226Ra, 232Th and 40K in soil samples from various studies around the world have values of 37, 30 and 400 Bq/kg respectively [UNSCEAR, 2000]. The values compared well with published data from UNSCEAR shows Ra-226, Th-232 from the location are well above the standards while K-40 below the risk value.

scholarly journals External radiation exposure of the Angolan population living in adobe houses

2019 ◽  
Vol 323 (1) ◽  
pp. 353-364 ◽  
Author(s):  
Judith Salupeto-Dembo ◽  
Zsuzsanna Szabó-Krausz ◽  
Péter Völgyesi ◽  
Zoltán Kis ◽  
Csaba Szabό
Keyword(s):  
Building Material ◽  
Gamma Ray ◽  
Radiation Risk ◽  
Radiation Hazard ◽  
External Radiation ◽  
Hazard Indices ◽  
Remote Areas ◽  
Activity Concentrations ◽  
Radiation Hazard Indices ◽  
Geological Formations

AbstractThis study aims to investigate the radioactivity of adobe in Angola, where it is a widely used building material. Sixty samples have been collected from three remote areas of the country with different geological backgrounds (Cabinda, Huambo, Menongue). Activity concentrations of 226Ra, 232Th and 40K have been determined by gamma-ray spectroscopy and radiation hazard indices were also calculated. The area Huambo shows elevated 226Ra and 232Th values which can be explained by its older geological formations. 40K concentrations are low in general. Regarding external radiation risk, adobe from Angola is safe to use as building material.

Dose estimates to the public due to 210Po ingestion via cocoa powder from Lolodorf high background radiation area, Cameroon

2018 ◽  
Vol 53 (3) ◽  
pp. 193-198
Author(s):  
S. Mvondo ◽  
J.F. Beyala Ateba ◽  
G.H. Ben-Bolie ◽  
P. Owono Ateba ◽  
A. Simo ◽  
...  
Keyword(s):  
Background Radiation ◽  
Dry Weight ◽  
Cocoa Beans ◽  
High Background ◽  
Cocoa Powder ◽  
Mean Values ◽  
The Public ◽  
Activity Concentrations ◽  
High Background Radiation Area ◽  
Radiation Area

210Po activity concentrations have been measured in Lolodorf high background radiation area in cocoa beans which are hand-processed into cocoa powder for breakfast purposes to estimate radiological dose to human. 210Po has been also measured in cocoa leaves and compared to the cocoa beans 210Po content. The analysis has been carried out by CANBERRA alpha spectrometry using ion-implanted silicon detectors. 210Po activity concentrations in cocoa beans varied from 2.31 ± 0.23 to 8.09 ± 0.56 Bq.kg−1, while these values varied from 21.7 ± 0.87 to 66.67 ± 1.58 Bq.kg−1 in cocoa leaves. The corresponding mean values are 4.96 ± 1.86 and 42.54 ± 16 Bq.kg−1 on a dry weight basis respectively. The obtained values confirm the fact that 210Po activity concentrations in cocoa leaves are high compared to the cocoa beans due to the deposition of 222Rn daughters in the atmosphere. The mean radiological doses to human were founded to be 0.227, 0.134, 0.083 and 0.062 mSv/year for children 2- to 7-year-olds, 7- to 12-year-olds, 12- to 17-year-olds and for adult respectively. Ingestion of cocoa powder by the most exposed group ages (children) might not exceed the recommended dose limit for members of the public, which is 1 mSv/year.

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