Suitable gamma energy for gamma-spectrometric determination of 238U in surface soil samples of a high rainfall area in India

Lenka, P.; Jha, S. K.; Gothankar, S.S.; Tripathi, R.M.; Puranik, V. D.

doi:10.1016/j.jenvrad.2009.03.015

Cited by 13 publications

(3 citation statements)

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“…The present study was the first attempt to study the culturable U-tolerant bacterial diversity from the premined U ore deposit in Domiasiat, India. The soil samples analysed from a geochemically unique habitat of exploratory drilling and test recovery plant showed acidic pH (4.3–6.3), which is attributed to the known presence of pyrite (FeS 2 ) and humic substance (coal) in the prevailing sandstone rocks ( 24 ). The soil samples had a moderate percentage of organic carbon but uranium concentration ranged from <10 ppm to 1,200 ppm.…”

Section: Discussionmentioning

confidence: 99%

Uranium (U)-Tolerant Bacterial Diversity from U Ore Deposit of Domiasiat in North-East India and Its Prospective Utilisation in Bioremediation

et al. 2013

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Uranium (U)-tolerant aerobic chemo-heterotrophic bacteria were isolated from the sub-surface soils of U-rich deposits in Domiasiat, North East India. The bacterial community explored at molecular level by amplified ribosomal DNA restriction analysis (ARDRA) resulted in 51 distinct phylotypes. Bacterial community assemblages at the U mining site with the concentration of U ranging from 20 to 100 ppm, were found to be most diverse. Representative bacteria analysed by 16S rRNA gene sequencing were affiliated to Firmicutes (51%), Gammaproteobacteria (26%), Actinobacteria (11%), Bacteroidetes (10%) and Betaproteobacteria (2%). Representative strains removed more than 90% and 53% of U from 100 μM and 2 mM uranyl nitrate solutions, respectively, at pH 3.5 within 10 min of exposure and the activity was retained until 24 h. Overall, 76% of characterized isolates possessed phosphatase enzyme and 53% had PIB-type ATPase genes. This study generated baseline information on the diverse indigenous U-tolerant bacteria which could serve as an indicator to estimate the environmental impact expected to be caused by mining in the future. Also, these natural isolates efficient in uranium binding and harbouring phosphatase enzyme and metal-transporting genes could possibly play a vital role in the bioremediation of metal-/radionuclide-contaminated environments.

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Section: Discussionmentioning

confidence: 99%

Uranium (U)-Tolerant Bacterial Diversity from U Ore Deposit of Domiasiat in North-East India and Its Prospective Utilisation in Bioremediation

et al. 2013

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“…The soil samples contained variable concentrations of U ranging from 40 μM to 5 mM (unpublished data). The pH of the soil was acidic within the range of 4.3 to 6.3 [20].…”

Section: Methodsmentioning

confidence: 99%

Occurrence of Horizontal Gene Transfer of PIB-type ATPase Genes among Bacteria Isolated from the Uranium Rich Deposit of Domiasiat in North East India

et al. 2012

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Uranium (U) tolerant aerobic heterotrophs were isolated from the subsurface soils of one of the pre-mined U-rich deposits at Domiasiat located in the north-eastern part of India. On screening of genomic DNA from 62 isolates exhibiting superior U and heavy metal tolerance, 32 isolates were found to be positive for PIB-type ATPase genes. Phylogenetic incongruence and anomalous DNA base compositions revealed the acquisition of PIB-type ATPase genes by six isolates through horizontal gene transfer (HGT). Three of these instances of HGT appeared to have occurred at inter-phylum level and the other three instances indicated to have taken place at intra-phylum level. This study provides an insight into one of the possible survival strategies that bacteria might employ to adapt to environments rich in uranium and heavy metals.

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“…Under oxidizing conditions, where uranium mostly stays in hexavalent states is more susceptible to leaching than radium. In such case, direct gamma line 63.29 keV of 234 Th, is the most suitable gamma energy to determine 238 U by gamma ray spectrometry[20]. However, thorium is Journal of Analytical Sciences, Methods and Instrumentation highly insoluble of nature and therefore in case of disequilibrium between 224 Ra and thoron ( 220 Rn) daughters.…”

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Precise Determination of Uranium Isotopes in Suez Canal Sediment

Abdellah¹

2019

JASMI

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The streambed sediments of the Suez Canal have been analyzed for determining the natural radionuclides and long-lived radionuclides such as uranium by gamma and alpha spectrometric techniques. The specific activities of 238 U series, 232 Th series and 40 K (Bq/kg) were measured by gamma spectrometry based on Hyper-Pure Germanium detector (HPGe). The average specific activities of 226 Ra( 238 U) series, 232 Th series and 40 K were ranged from 3.04 ± 1.10 to 14.70 ± 1.24 Bq/kg, from 1.12 ± 0.66 to 16.10 ± 1.30 and from 77 ± 4.90 to 350.50 ± 8.90 Bq/kg respectively. The concentration of 238 U and 234 U in the streambed sediments are ranged from 3.24 ± 0.21 to 13.34 ± 0.61 ppm and from 3.18 ± 0.02 to 13.77 ± 0.03 ppm in dry weight respectively. 234 U/ 238 U ratios of the sediments are relatively lower than unity in many locations indicating the preferential uranium leaching process. The results with the high ratios for 234 U/ 238 U were observed in the sediment collected from Port Said. This may be attributed to the sorption of uranium by sediment which has a relatively high content of organic matter. The geochemical behavior of sediment, the chemistry of uranium and the flow rates of water are considered as the most important factors controlling uranium isotopic composition of the streambed sediment. The result of radioactivity in sediment samples can be used to distinguish any future changes due to non-nuclear industries on the Suez Canal area.

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Suitable gamma energy for gamma-spectrometric determination of 238U in surface soil samples of a high rainfall area in India

Cited by 13 publications

References 13 publications

Uranium (U)-Tolerant Bacterial Diversity from U Ore Deposit of Domiasiat in North-East India and Its Prospective Utilisation in Bioremediation

Uranium (U)-Tolerant Bacterial Diversity from U Ore Deposit of Domiasiat in North-East India and Its Prospective Utilisation in Bioremediation

Occurrence of Horizontal Gene Transfer of PIB-type ATPase Genes among Bacteria Isolated from the Uranium Rich Deposit of Domiasiat in North East India

Precise Determination of Uranium Isotopes in Suez Canal Sediment

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