Natural radionuclide activities in forest soil horizons of Mount IDA/Kazdagi, Turkey

Abstract

Natural radioactivity distribution of (40)K, (238)U, and (232)Th isotopes in forest soils was investigated by using gamma-ray spectrometry. An extensive radioecological study was carried out between 2010 and 2013 in Mount IDA/Kazdagi, located in Edremit region in Turkey. A total of 341 soil samples were collected from the surface and organic horizons (OL, OF+OH, and A) in 118 soil profiles. The distributions of natural radioactivity levels in these horizons and corresponding absorbed dose rates from outdoors terrestrial gamma radiation throughout the region were mapped in detail. Mean (40)K activity values over the combined horizons varied between 43 and 1,008 Bq kg(-1); whereas, mean (226)Ra and (232)Th concentrations over the combined horizons ranged between 5-152 and 6-275 Bq kg(-1), respectively. Our data indicate that the radioactivity values of the study sites were within the universal normal range. The significant variation among the (232)Th, (226)Ra, and (40)K activities and gamma dose rate might be due to the geological variation in the study sites.

Determination of radioactivity levels of soil samples and the excess of lifetime cancer risk in Rize province, Turkey

“…The 137 As shown in table 3, the radioactivity concentrations in soil samples were comparable to other studies in various regions (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(35)(36)(37)(38)(39)(40) . Karadeniz (8,12,17,19,25) . Merdanoglu and Altınsoy et al, Orgun et al and Abbaspour et al determined a higher activity concentrations of 226 Ra and 232 Th compared to this study (13,20,35) .…”

“…Merdanoglu and Altınsoy et al, Orgun et al and Abbaspour et al determined a higher activity concentrations of 226 Ra and 232 Th compared to this study (13,20,35) . 40 K activity concentrations of Rize were also higher compared to studies conducted at other parts of Turkey (8,12,(14)(15)(16)(17)19,21,22) .…”

“…Measuring terrestrial gamma dose rates is also essential since gamma radiation provides information concerning excess lifetime cancer risks. Yet in Turkey, there are only a limited number of studies which evaluate soil radioactivity and terrestrial gamma dose rates (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25) .…”

“…226 Ra, 232 Th , 40 K and 137 Cs ac vity concentra ons, absorbed dose rates (D), annual effec ve dose equivalents (AEDE) and excess life me risks of cancer (ELCR) in various studies. (14) 37 40 667 8 71 87 0.51 Manisa (12) -27 340 -54 66 -Istanbul (16) -37 342 1.8-81 49 65 -Marmara (17) 22.5 26.6 443 0.9-154 44.73 54.86 -Kestanbol (18) 130.93 192 1207 0.37-36 219 269 -Kastamonu (19) 37.4 27.17 431.43 8.02 52.76 65 -Çanakkale (20) -204.69 1171 0-6.57 178-448 --Kazdağı (8) 21.7 21.1 297.5 0.1-28 44 67 -Sanliurfa (22) -24.95 298.6 9.08 38.24 60.09 -FırJna (23) 15-116 10-105 105-1235 19-232 77.4 --Eastern Black Sea (24) 12-120 40.9 622.8 169.7 77.18 93.30 -Giresun (25) 33 43 733 318 -92 -Iran (35) 1188 64.92 545.10 10.41 612.37 750 0.30 India (36) 57 world's mean value of life time total gamma dose and the excess lifetime cancer risk are 4.90 mSv and 0.29×10 -3 , respectively (5) . The mean of life time total gamma dose and the excess lifetime cancer risk observed in this study are higher than the world's mean values.…”

Activity of 210Po and 210Pb in the riverine environs of coastal Kerala on the southwest coast of India

“…Natural radionuclides are present at low concentration in soil, water, air and food. The level of terrestrial environmental radiation depends primarily on the geological and geographical conditions and can be different levels in the soils of each different geological region (Karadeniz, Karakurt, & Akal, 2015). The radionuclides 210 Po and 210 Pb, widely present in the terrestrial environment, are the final long lived radionuclides in the decay of 238 U in the earth's crust.…”