Assessment of effective dose and radiological risk from natural radioactivity in rock samples of Davanagere locality, Karnataka, India

2022 ◽  
pp. 1-18
Author(s):  
Malleshi Kavasara ◽  
Vinutha P R ◽  
Kaliprasad C S ◽  
Narayana Yerol
Keyword(s):  
Effective Dose ◽  
Natural Radioactivity ◽  
Radiological Risk ◽  
Rock Samples

scholarly journals Uran, thorium a draslík v krystaliniku a paleozoických sedimentech na mapovém listu 14-33 Polička – laboratorní gamaspektrometrie a parciální chemické složení variských plutonitů

2017 ◽  
Vol 24 (1-2) ◽  
Author(s):  
Jiří Zimák
Keyword(s):  
Natural Radioactivity ◽  
Gamma Ray ◽  
Igneous Rocks ◽  
Crystalline Complex ◽  
Rock Samples ◽  
Gamma Ray Spectrometer ◽  
Variscan Granitoids ◽  
Mass Activity ◽  
Geological Units

The paper deals with natural radioactivity of metamorphic and igneous rocks and Palaeozoic sediments within the map sheet 14-33 Polička. Studied rocks belong to three geological units: the Hlinsko Zone (phyllites and quartzites of the Mrákotín Fm., flysch sediments of the Hlinsko-Rychmburk Fm.), the Svratka Crystalline Complex (mainly mica schists, paragneisses, orthogneisses and migmatites, also amphibolites, skarns, erlans and quartzites) and the Polička Crystalline Complex (mica schists, paragneisses to migmatites and the Variscan granitoids are dominant). Concentrations of potassium, uranium and thorium were measured using a laboratory gamma-ray spectrometer in 805 rock samples. Data are tabled and discussed. Natural radioactivity of rocks is evaluated on the basis of the calculated values of mass activity of 226Ra equivalent (am). Slightly increased am values were found in migmatites and orthogneisses of the Svratka Crystalline Complex (187 Bq.kg-1 on average), granites and granodiorites of the Budislav Pluton (216 Bq.kg-1), granodiorites and rocks of a tonalite suite of the Miřetín Pluton (199 and 194 Bq.kg-1). Increased concentrations of uranium and thorium were found in some samples of pegmatite and aplite. Radioactivity of rocks of the Hlinsko-Rychmburk and Mrákotín Fms. can be assessed as relatively low.

scholarly journals Radiation Dose Estimation of Cement Samples Used in Lao PDR

2017 ◽  
Vol 27 (3) ◽  
pp. 193
Author(s):  
Sonexay Xayheungsy ◽  
Le Hong Khiem ◽  
Le Dai Nam
Keyword(s):  
Effective Dose ◽  
Dose Rate ◽  
Natural Radioactivity ◽  
Building Materials ◽  
Lao Pdr ◽  
Specific Radioactivity ◽  
Weighted Average ◽  
Radiation Hazard ◽  
Absorbed Dose Rate ◽  
Radium Equivalent Activity

The natural radioactivity due to presence of 226Ra, 232Th and 40K radionuclides in Lao PDR cements was measured for first time using a gamma-spectrometry with HPGe detector. Two different types of cement produced by 4 local cement companies in Lao PDR have been investigated.  The specific radioactivity of 226Ra, 232Th and 40K in the investigated samples ranged from 24.83 ± 1.18  to 54.39 ± 5.90  Bq kg-1 with a mean of 37.76 ± 10.71 Bq kg-1, 6.63 ± 1.59 to 21.17 ± 0.48 Bq kg-1 with a mean of 13.77 ± 5.85 Bq kg-1 and 43.28 ± 7.68 to 168.70 ± 3.34 Bq kg-1 with a mean of 116.07 ± 47.50 Bq kg-1, respectively. The radium equivalent activity (Raeq), the gamma-index, the external and internal hazard indices, Absorb Dose Rate in Air (D) and Annual Effective Dose Equivalent (AEDE) were estimated for the radiation hazard of the natural radioactivity in all cement samples. The obtained results were compared with the corresponding values for cement of different countries. The calculated Raeq values of Lao PDR samples are lower than the limit of 370 Bq kg-1 set fo building materials. The mean indoor absorbed dose rate is slightly lower than the population-weighted average of 84 nGy h-1 while the corresponding effective dose was 79% less than the dose ft of 1 mSv y-1. The results obtained in this study show no significant radiological hazards arising from using Lao PDR cement for construction of houses.

scholarly journals Determination of the Radiological Risk from the Natural Radioactivity in Irrigation at Selected Areas of Peninsular Malaysia

2020 ◽  
Vol 49 (6) ◽  
pp. 1439-1450
Author(s):  
Khoirul Solehah Abdul Rahim ◽  
Zalita Zainuddin ◽  
Mohd Idzat Idris ◽  
Wahmisari Priharti ◽  
Murtadha Sh. Aswood
Keyword(s):  
Natural Radioactivity ◽  
Peninsular Malaysia ◽  
Radiological Risk
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