Application of multivariate technique to evaluate spatial distribution of natural radionuclides along Tamil Nadu coastline, east coast of India

Bramha, Satyanarayan; Sahoo, Sunil Kumar; Subramanian, V.; Venkatraman, B.; Rath, Prasanta

doi:10.1007/s42452-019-0716-9

Cited by 18 publications

(3 citation statements)

References 52 publications

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“…After all, natural-source radiation accounts for most of the human population's overall radiation exposure [1]. Natural uranium and thorium can be detected in different proportions in all terrestrial materials, depending on the geology of each area [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Natural Radionuclide Levels and Radiological Hazards of Khour Abalea Mineralized Pegmatites, Southeastern Desert, Egypt

et al. 2022

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Arranged from oldest to youngest, the main granitic rock units exposed in Khour Abalea are metagabbros, cataclastic rocks, ophiolitic melange, granitic rocks, pegmatite and lamprophyre dykes. The presence of radioactivity associated with the heavy bearing minerals in construction materials—like granite—increased interest in the extraction process. As it turns out, granitic rocks play an important economic part in the examination of an area’s surroundings. The radionuclide content is measured by using an NaI (Tl)-detector. In the mineralized pegmatites, U (326 to 2667 ppm), Th (562 to 4010 ppm), RaeU (495 to 1544 ppm) and K (1.38 to 9.12%) ranged considerably with an average of 1700 ppm, 2881.86 ppm, 1171.82 ppm and 5.04%, respectively. Relationships among radioelements clarify that radioactive mineralization in the studied pegmatites is magmatic and hydrothermal. A positive equilibrium condition confirms uranium addition to the studied rocks. This study determined 226Ra, 232Th and 40K activity concentrations in pegmatites samples and assessed the radiological risks associated with these rocks. The activity concentrations of 226Ra (13,176 ± 4394 Bq kg−1), 232Th (11,883 ± 5644 Bq kg−1) and 40K (1573 ± 607 Bq kg−1) in pegmatites samples (P) are greater than the global average. The high activity of the mineralized pegmatite is mainly attributed to the presence of uranium mineral (autunite), uranophane, kasolite and carnotite, thorium minerals (thorite, thorianite and uranothorite) as well as accessories minerals—such as zircon and monazite. To assess the dangerous effects of pegmatites in the studied area, various radiological hazard factors (external, internal hazard indices, radium equivalent activity and annual effective dose) are estimated. The investigated samples almost surpassed the recommended allowable thresholds for all of the environmental factors.

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Section: Introductionmentioning

confidence: 99%

Natural Radionuclide Levels and Radiological Hazards of Khour Abalea Mineralized Pegmatites, Southeastern Desert, Egypt

et al. 2022

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“…Humans are continuously exposed to natural radiation which comes from cosmogenic radionuclides and primordial radionuclides [1]. The cosmogenic radionuclides are continuously produced in the upper part of the atmosphere by the interaction of the cosmic radiation with atoms or molecules.…”

Section: Introductionmentioning

confidence: 99%

Assessment of natural radioactivity and its radiological hazards in several types of cement used in Senegal

et al. 2020

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In this study, the activity concentrations of 226 Ra, 232 Th and 40 K in twenty cement samples of four types (CEM, CEM II, CEM III, and CEM IV) collected from building material suppliers in Senegal were measured using a low-background digital gamma-ray spectrometer equipped with broad energy germanium detector. The activity concentrations of 226 Ra, 232 Th and 40 K varied from 7.1-150.3 Bq kg −1 , 3.7-16.1 Bq kg −1 , and 48.7-133.9 Bq kg −1 , respectively. Also, possible radiological risks from the usage of these materials were assessed by estimating external and internal index, indoor absorbed gamma dose rate and the corresponding annual effective dose, effective dose rate to different body organs and tissus, and excess lifetime cancer risk. The estimated radiological hazard indices were revised in light of the relevant national and international legislation and guidance. The values of the radiological hazard indices were found to be within relevant all limit values for structural building materials.

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“…These may have a significant influence on the concentration of artificial radionuclides in sediments, soil, and atmosphere (Fallah et al, 2019). Humans are constantly exposed to natural radioactivity, both ground radioactivity and cosmic rays, and the safety limit for this background radiation varies from 1 to 50 mSv −1 (Bramha et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Radiological risk assessment and spatial distribution of naturally occurring radionuclides within riverbed sediments near uranium deposits: Tulgheș-Grințieș, Eastern Carpathians (Romania)

Sandu

Iancu

Chelariu

et al. 2020

Journal of Radiation Research and Applied Sciences

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The concentration and spatial distribution of three naturally occurring radionuclides, 238 U, 232 Th and 40 K, has been determined in stream sediments from six left side tributaries of Bistricioara river (Bistriței Mountains, Eastern Carpathians, Romania). Historically, several mining works were undertaken in the area, with a view of exploring its' potential regarding mineral resources. The aim of this study is to serve as a reference point for future environmental monitoring, in the event of resuming the mining activities in this area, which accommodates a major uranium deposit. Stream sediment samples were collected from the riverbed and the concentration of naturally occurring radionuclides was determined using gamma-ray spectrometry with a high purity germanium (HPGe) detector. The average activity concentration of 238 U, 232 Th and 40 K was found to be 27.84, 41.08 and 511.27 Bq•kg −1 . Based on radionuclides' activity concentrations, radiological hazard parameters were estimated in order to assess any radiation risk which may be associated with the riverbed sediments. The radiological hazard parameters, such as radium equivalent activity (Ra eq. ), absorbed gamma dose rates in air (D R ), annual gonadal dose equivalent (AGDE), representative level index (RLI), annual effective dose equivalent (AEDE), external hazard index (H ex ) and internal hazard index (H in ), were all calculated and later compared with international safety limits. Generally, all radiological hazard parameters have values lower than world average excepting AGDE and RLI values that exceed the UNSCEAR thresholds.

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Application of multivariate technique to evaluate spatial distribution of natural radionuclides along Tamil Nadu coastline, east coast of India

Cited by 18 publications

References 52 publications

Natural Radionuclide Levels and Radiological Hazards of Khour Abalea Mineralized Pegmatites, Southeastern Desert, Egypt

Natural Radionuclide Levels and Radiological Hazards of Khour Abalea Mineralized Pegmatites, Southeastern Desert, Egypt

Assessment of natural radioactivity and its radiological hazards in several types of cement used in Senegal

Radiological risk assessment and spatial distribution of naturally occurring radionuclides within riverbed sediments near uranium deposits: Tulgheș-Grințieș, Eastern Carpathians (Romania)

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