In situ gamma ray measurements for deciphering of radioactivity level in Sarıhan pluton area of northeastern Turkey

Çınar, Hakan; Altundaş, Suna; Çeli̇k, Necati; Maden, Nafız

doi:10.1007/s12517-017-3225-4

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…These background radiations are attributed mainly to primordial radionuclides, especially 40 K, 238 U and 232 Th and their daughter products; with minor contributions from cosmogenic radiations; and human produced radiations from mining, and production and application of fertilizers (e.g. phosphate-rich fertilizers), etc (Abd El-Naby and Saleh 2003; Tzortzis and Tsertos 2004;Akkurt et al 2010;Cinar et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Radioactivity, radiogenic heat production and environmental radiation risk of the Basement Complex rocks of Akungba-Akoko, southwestern Nigeria: insights from in situ gamma-ray spectrometry

et al. 2021

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The Basement Complex rocks of Akungba-Akoko, southwestern Nigeria, typically migmatites (M), biotite gneisses (BGN), granite gneisses (GGN), charnockites (Ch), biotite granites (BG) and pegmatites (P), were assessed using ground gamma-ray spectrometry (GRS). This study aimed at determining rocks' radionuclides concentration, alterations, radionuclides mobilization, radiogenic heat production (RHP) rate (first report for the area) and environmental radiation risk to humans. The results of this study were integrated with previous data on the petrography and geochemistry of these rocks, for detailed interpretation. The results of average elemental and activity concentrations for Akungba-Akoko rocks, were 2.66%, 3.16 ppm and 13.98 ppm, and 831.35, 39.01 and 56.77 for 40 K, 238 U and 232 Th, respectively; with increasing rock order of Ch < M < GGN < BGN < P < BG. High radionuclides concentration in the rocks, with exception of charnockites, were determined by high fraction of K-feldspar, plagioclase, biotite and accessory minerals -zircon and monazites. On the other hand, the low radionuclides concentration in the rocks, especially in Ch and M, were aided by the variability of the naturally occurring radioactive elements (NORMs) caused by alterations and mobilization during metamorphism and crystallization processes as suggested by radioelements composite, K/eTh ratio and F-parameter of Efimov analyses. RHP average of 2.03 µ above the crustal average range of 0.8 -1.2 µ may have significantly contributed to the heat flux in the studied area; however, the RHP of charnockites are lower than the crustal range. The absorbed dose rate average of 87.98 was within the permissible range, and other estimated radiological parameters, namely annual effective doses, hazard indices, gamma activity and activity utilization index, were all far below the permissible limit of 1 for these rocks. However, annual gonad dose equivalent (618.874) and excess life cancer risk (1.511 10 ) were above their permissible limits. Due to the high gamma radiations from the pegmatitic and biotite-rich rocks in the studied area, their high usage should be reduced. Hence, periodic monitoring of the study area is advised.

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Section: Introductionmentioning

confidence: 99%

Radioactivity, radiogenic heat production and environmental radiation risk of the Basement Complex rocks of Akungba-Akoko, southwestern Nigeria: insights from in situ gamma-ray spectrometry

et al. 2021

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“…The lowest concentration values were found in the Hozbirikyayla Formation (consisting of sandy limestones and limestone) and the ophiolitic olistostromal mélange containing sandstone, gravelly sandstone, basalt, and andesite. The highest radionuclide concentration and dose rate values were obtained in the Sarıhan granodiorite containing quartz diorite, granodiorite, and quartz monzodiorite [54]. Potassium is abundant in rock-forming minerals, especially in K feldspars (orthoclase, microcline, and mica (biotite)).…”

Section: Assessment Of In-situ Gamma-ray Data In the Sarıhan Granodio...mentioning

confidence: 99%

Uranium migration and radioactive characteristics of the Sarıçiçek and Sarıhan Granodiorites

Altundaş

Çınar

2023

Turkish Journal of Engineering

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In the study, in situ gamma-ray measurements were applied on Sarıhan and Sarıçiçek granodiorites and the formations surrounding these units. The concentrations of radionuclide (eU(ppm), eTh(ppm), K(%)) and dose rate values were measured in total at 532 points (265 and 267 measurements were taken in Gümüşhane and Bayburt, respectively.) in both areas with a duration of 5 minutes at each measurement point. By using the obtained concentration data, the radioelement ratios (eU/eTh, eU/K, and eTh/K) give information about the origins of the rocks belonging to the study areas, the geochemical indicators (Ume, F parameter, and eU-(eTh/3,5) rate ) showing the uranium mobility and the radioelement concentrations were calculated and mapped. While the average K, eU, and eTh concentrations for Sarıçiçek granodiorite were calculated as 2.98%, 3.15 ppm, and 12.45 ppm, Sarıhan granodiorite was 1.83%, 2.73 ppm, and 13.6 ppm, respectively. The higher radioactivity values were obtained than the surrounding formations consisting of basaltic, sedimentary, and ultramafic rock combinations on the granodiorite masses. In the classification made according to radioelement ratios, it is concluded that the rocks in the study areas are formed as a mixture of the upper mantle and crustal materials. In both study areas, there is uranium transport from the granodioritic masses to the surrounding rocks, and accordingly, the rocks in the surrounding formation are enriched in uranium. As a result, radioactivity levels, rock formation origins, and uranium transport of both granodioritic masses and rocks in the surrounding formations were determined by evaluating together with the radioelement concentration values and ratios and migration parameters, and the studied areas were characterized by associating them with geology in the light of radioactive data.

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“…The method can be applied to evaluate concentrations of radionuclide in many geothermal fields and excavation sites (Faruwa et al 2020;Cinelli et al 2020). It can also be used to decide the nature and uranium migration (UM) rate in many crustal formations (Youssef et al, 2017;Pereira and Ferreira, 2018;Reis et al 2020) (Yuan 2023), sedimentary surface identification for exploration of oil and gas, radioactive pollution discovery (Cinar et al 2017), mineral probing (Chandrasekaran et al 2014), pure earth science discoveries (Ray 2008;Sims 2021), facture and fissure unearthing linked with uranium concentrations elevation which is caused by uranium movement in fluid in the subsurface (Grozeva 2022) which can cause substantial problem for gamma-ray spectrometry investigation and explanation known as disequilibrium (Lefebvre 2022;Grozeva 2022;Cai 2015).…”

Section: Gamma Ray Spectrometry and Radioactive Series Disequilibriummentioning

confidence: 99%

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

Alabi,

Sedara,

Ajah

et al. 2023

Preprint

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Many factors complicate the estimation of radiogenic heat production (RHP) which may lead to radionuclide concentrations which does not characterize the RHP being produced by rocks. One of this is the Uranium disequilibrium effect. We modified an existing model to minimize this effect. A revised data from gamma-ray spectrometry was used to compute the Beta and Alpha energies (Eβmax) of decay schemes, mass defect (EΔm)of radioelements, total absorbed energy (Eabs) per atom, numerical constants (Ai) and converted to the accepted RHP unit (µWm-3). The modified RHP model (A3) was evaluated and validated using error metrics and radiometric data from seven regions of Nigeria and India. The data was normalized to transform features to be on a similar scale to attain a normal distribution of the data. The modified model (A3) was compared with Birch’s (A1) and Rybach’s (A2) RHP models. All these processes were implemented in Python environment. The RHP constants is several percent higher (6.2% for U; 11.5% for Th) than the values of A1 and A2 RHP models except for Potassium which is higher (74.3%). The A3 RHP model gotten is: A(µWm-3) = ρ(0.103CU + 0.29CTh + 0.061CK). The contributing percentages of the radioelements were in the order of 40K > 238U > 232Th for the Southwest, Southeast and Northcentral regions of Nigeria while the order is 238U > 232Th > 40K for the Southsouth, Northeast and Northwest regions and in order 232Th > 238U > 40K for the Indian region. The A3 model returned a higher R2 value and lower SSE/RMSE/MAE values compared to A1 and A2 models. The R2 values ranged from 42–72% while RMSE ranged from 0.790–1.127. The A3 has the best performance in all metrics for all the regions. The coefficient of determination (R2) for the proportion of variance of the contribution of the radioelements placed K-40 as most dependent variable with a good correlation with the total RHP in the order of use of A1 < A2 < A3. In general A3 return the highest RHP values across all regions. The A3 RHP model gave a higher R2 value and lower RMSE, MAE, SSE values than A1 and A3 RHP models which is an indicator of best performance. The A3 RHP model performed well in all the regions in Nigeria and outside Nigeria. This shows that the A3 RHP model is not geological-formation dependent.

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In situ gamma ray measurements for deciphering of radioactivity level in Sarıhan pluton area of northeastern Turkey

Cited by 10 publications

References 28 publications

Radioactivity, radiogenic heat production and environmental radiation risk of the Basement Complex rocks of Akungba-Akoko, southwestern Nigeria: insights from in situ gamma-ray spectrometry

Radioactivity, radiogenic heat production and environmental radiation risk of the Basement Complex rocks of Akungba-Akoko, southwestern Nigeria: insights from in situ gamma-ray spectrometry

Uranium migration and radioactive characteristics of the Sarıçiçek and Sarıhan Granodiorites

Modification of Radiogenic Heat Production (RHP) Equation due to Radioactive Disequilibrium in Rock Samples from Gamma-Ray Spectrometry

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