Distribution pattern of natural radionuclides in Lake Nasser bottom sediments

Study of the spatial distribution of natural radioactivity in the upper Egypt Nile River sediments

“…Table 4 shows the concentration ranges obtained from each section compared with the other referenced values. The detected ranges of 238 U and 232 Th are in agreement with the other referenced data for the other parts of Nile River (Ibrahiem et al, 1993;Ismail et al, 1994;El-Tahawy et al, 2001;Khater et al, 2005;Saleh et al, 2006). The only exception is the black sand locations in both Rashid and Damietta.…”

“…Different literatures have been published concerning the radioactivity in the Nile River sediments of Lower and Middle Egypt (Ibrahiem et al, 1993), Nasser Lake (Ismail et al, 1994;Khater et al, 2005) Rashid and Damietta estuaries (El-Tahawy et al, 2001;El-Gamal et al, 2006;Saleh et al, 2006).…”

Measurements for Natural Radioactive Materials at the East & West banks of The River Nile

“…Table 7 shows the concentration ranges obtained from each section compared with the other referenced values. The detected ranges of 238 U and 232 Th are in agreement with the other referenced data for the other parts of Nile River [16]; [18]; [14]; [17]; [20].…”

“…From the other side, Th/U ratios have been calculated and listed in Table 6. The presence of calcium carbonate sediments could be playing an important role for depletion of the 232 Th relative to 238 U [16]. [30] have mentioned that 0.7-0.4 is the typical range for igneous zircon.…”

Natural Radionuclides and Heavy Metals Concentration of Marine Sediments in Quseir City and Surrounding Areas, Red Sea Coast-Egypt

“…The absorbed dose rates due to gamma radiations in air(in outdoor air Do,nGy h -1 )at1m above the ground surface for the uniform distribution of the naturally occurring radionuclides ( 226 Ra, 232 Th and 40 K) were calculated based on guidelines provided by UNSCEAR (2000) [32]. The conversion factors used to compute absorbed gamma dose rate (Do) in air per unit activity concentration in Bq/kg (dry weight) corresponds to 0.462nGy/h for 226 Ra, 0.604nGy/h for 232 Th and 0.042 nGy.h -1 for 40 K. Therefore Do can be calculated as follows (UNSCEAR, 2000) [43]:…”