Natural Radioactivity and Associated Dose Rates in Soil Samples of Malnichera Tea Garden in Sylhet District of Bangladesh

Miah, Alamgir; Miah, M.M.H.; Kamal, Masud; Chowdhury, M. I.; Rahmatullah, M.

doi:10.5923/j.jnpp.20120206.03

Cited by 27 publications

(23 citation statements)

References 8 publications

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“…The Ra eq in the study area ranges from 60.41 to 635.22 Bqkg Organization of Economic Cooperation Development (Miah et al, 2012 . This value is higher than the world average value of 60 nGyh -1 (UNSCEAR, 2000), which indicates that the dose from the study area is higher than most places in the world.…”

Section: Resultsmentioning

confidence: 99%

Assessment of radiological risk from the soils of artisanal mining areas of Anka, North West Nigeria

Akpanowo¹,

Umaru²,

Iyakwari³

2019

Afr. J. Environ. Sci. Technol.

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Assessment of radiological risk was carried out on twenty soil samples collected from agricultural, mining and mine processing areas in Anka, Zamfara State, North Western Nigeria. The measurement of activity concentration of 226 Ra, 232 Th and 40 K was performed using the gamma-ray spectrometer equipped with a high purity germanium detector. The values of the activity concentration of 226 Ra ranged from 24.69±4.26 to 82.20±15.62 Bqkg -1 , with a mean of 47.06±14.01 Bqkg -1 ; 232 Th ranged from 22.52±3.44 to 159.47±16.81 Bqkg -1 , with a mean of 75.97±9.11; while 40 K ranged from 27.20±8.03 to 542.64±156.93 Bqkg -1 , with a mean of 216.02±62.37 Bqkg -1 . The concentration of the Radium equivalent in the study area ranged from 60.41 to 307.30 Bqkg -1 , with mean value of 172.33 Bqkg -1 . The absorbed dose rate in air was calculated and the values ranged between 26.80 and 135.02 nGyh -1 , with a mean of 76.64 nGyh -1 . The external hazard index was computed and the values ranged from 0.163 to 0.830, with a mean of 0.465. This value is within the safe limit of 1. The annual effective dose rate was calculated from the activity concentration with the minimum value of 32.87 µSvy -1 , while the maximum was 165.58 µSvy -1 , with a mean of 93.99 µSvy -1, which is higher than the world average of 80 µSvy -1 but less than the recommended annual effective dose safe limit of 1 mSvy -1 . Therefore, the soil does not constitute radiological threat to the local population in the environment.

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Section: Resultsmentioning

confidence: 99%

Assessment of radiological risk from the soils of artisanal mining areas of Anka, North West Nigeria

Akpanowo¹,

Umaru²,

Iyakwari³

2019

Afr. J. Environ. Sci. Technol.

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“…Natural radionuclide in soil contributes a significant amount of the population through inhalation and ingestion. The main contributors of radionuclides are 40 K and 232 Th and these radionuclides are not uniformly distributed in soils and vary from region to region [Miah et al 2012]. Natural radioactivity is wide spread in the environment and it exists in various geological formations in soil, rocks, plants, water and air.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Natural Radioactivity and Radiation Hazard in Soil Samples of Rajbari District of Bangladesh

Khatun

Saadat

Ahasan

et al. 2013

Jahangirnagar Univ Environ Bull

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The activity of naturally occurring 238 Rajbari district of Bangladesh, have been studied and possible health effect were estimated. The experiment has been done by using gamma ray spectrometry system consisting of a HPGe detector coupled with MCA and associate electronics. The average natur 29.03±5.67 Bq/kg, 50.91±10.17 Bq/kg and 535.32±89.19 Bq/kg respectively. To estimate health effect due to the activity of those radionuclides, the radium equivalent activity (Ra absorbed dose rate (D) and effective dose have been calculated and compared to the world average values. The results are also compared with the literature values reported for other regions of the world and found that the soil of the study area are not hazards by the radiation and does not pose any harmful effect to the environment. The outcome of this study may provide valuable information about radiation hazard and also may take part in the monitoring of environmental radioactivity.

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“…The absorbed dose rates in outdoor air (D) at about 1 m above the ground surface were calculated. The conversion factors used to compute absorbed gamma-ray dose rate in the air corresponds to 0.46 nGy h -1 for 226 Ra, 0.62 Gyh -1 for 232 Th and 0.042 nGyh -1 for 40 K. Therefore, D R can be calculated according to [1,3]: D R (nGyh -1 )=0.46 A Ra +0.62A Th +0.042 A K ( 3)…”

Section: Air-asorbed Dose Ratementioning

confidence: 99%

“…The 226 Ra subseries contribute about 98% of the external γ dose induced by whole 238 U series. Radiological hazard parameters are calculated based on the specific radioactivity of 40 K, 226 Ra and 232 Th in the soil samples [1][2][3]. The low resolution energy of the NaI(Tl) detector with full width at half maximum (FWHM) is 70 keV at the 1332 keV, there are many overlapping full energy peaks of natural radiation isotopes.…”

Section: Introduction mentioning

confidence: 99%

Determination of natural radioactivity in soil samples around gold mining area in Khamkeut district, Bolikhamxay Province, Laos using gamma ray spectrometer with NaI(Tl) detector

Leuangtakoun

2018

MaP

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This paper presented the method of determining the radioactivity of 40K, 226Ra and 232Th in soil samples by gamma-ray spectrometer using NaI (Tl) scintillation detector. The radioactivity of each isotope is calculated based on the net count rate in the energy window characteristic for the 40K, 226Ra and 232Th radioisotopes respectively. We have determined activity concentrations of the natural radionuclides 226Ra,232Th and 40K in 15 soil samples collected around gold mines of Khamkeut district, Bolikhamxay Province, Laos. The average activity concentrations of the natural radionuclides 226Ra, 232Th and 40K are 46.58 ± 7.36 , 71.19 ± 5.42 and 574.62 ± 25.02 Bq.kg-1, respectively. The average activity concentrations of 226Ra and 232Th in this work are higher than those of Bolikhamxay Province, Laos and the world average values. The estimated average outdoor annual effective dose (E) and radium equivalent actitvity (Raeq) are 0.10 ± 0.004 mSv.yr-1 and 192.64 ± 16.12 Bq.kg-1, respectively.

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Natural Radioactivity and Associated Dose Rates in Soil Samples of Malnichera Tea Garden in Sylhet District of Bangladesh

Cited by 27 publications

References 8 publications

Assessment of radiological risk from the soils of artisanal mining areas of Anka, North West Nigeria

Assessment of radiological risk from the soils of artisanal mining areas of Anka, North West Nigeria

Assessment of Natural Radioactivity and Radiation Hazard in Soil Samples of Rajbari District of Bangladesh

Determination of natural radioactivity in soil samples around gold mining area in Khamkeut district, Bolikhamxay Province, Laos using gamma ray spectrometer with NaI(Tl) detector

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