Phosphate Rock 40k

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Radioactive rock phosphate: the feed stock of phosphate ...

The concentrations of 40K and 232Th were of the order of background level on the Earth's crust. Chemical analysis for concentration of different constituents in rock phosphate was also carried out. The higher the concentrations of P2O5 and K2O were, the higher the specific activities of 226Ra and 40K were, respectively, in the rocks under study. The amount of radioactivity in the rock phosphate is a …

Radiometric analysis of Hazara phosphate rock and ...

01.01.1998· Natural radioactivity due to 40 K, 226 Ra and 232 Th has been measured in phosphate rock samples, collected from various localities of Hazara division of Pakistan, and in locally prepared and imported fertilizer. For data acquisition and analysis, a high-purity germanium (HPGe) detector and a PC-based MCA were used.

238 232Th, 226Ra, and 40K in the Production Cycle of ...

production cycle of phosphate rock was 40K, and the median 40K activity was 8.972 Bq·g-1 and 1.496 Bq·g -1 , respectively. For the 238 U series, the activity of U and 226 Ra was greatest in phos-

40K Ra ( U) 232Th (228Ra) Raw materials – part 1 MIN MAX ...

Update for the Appendix I - Activity concentrations for materials that could be encountered at international borders, from: The trade in radioactive materials - potential problems and possible solutions, NORM-V Proceedings, IAEA, 2008, pp.437-453 6 Raw materials – part 6 40K 226Ra (238U) 232Th (228Ra) MIN MAX MIN MAX MIN MAX Phosphate rock (India) n/a 0.033 1.7 n/a

Activity concentrations of 226Ra, 232Th and 40K in brands ...

24.02.2011· From Table 3, the activity concentrations of 40 K, 226 Ra and 232 Th obtained for phosphate rock from Sokoto are 536.2 ± 45.3, 1038 ± 28.4 and 257.9 ± 35.6 Bq kg −1, respectively, while the values obtained for phosphate rock from Togo (a neighbouring country of Nigeria) were 871.0 ± 54.7, 1801.4 ± 37.6 and 15.6 ± 5.1 Bq kg −1 for 40 K, 226 Ra and 232 Th, respectively.

(PDF) Radiometric analysis of Hazara phosphate rock and ...

CONCLUSION The specific gamma ray activities due to 40K, 226Ra and 232Th in phosphate rock samples, collected from various localities of Hazara Division, and different brands of locally prepared and imported fertilizer in Pakistan, have been measured using the gamma spectroscopy technique. The 226Ra content is very high and is found to vary from 307.7 Bqkg-’ to 617.5 Bq kg-‘. This can result in significant radiation exposure if the rock …

Phosphex Weapon - Warhammer 40k - Lexicanum

17.11.2020· Phosphex Weapon. From Warhammer 40k - Lexicanum. Jump to: navigation. , search. The effects of Phosphex weapons on an Iron Warrior Terminator. Phosphex Weapons are a class of extremely deadly Imperial incendiary weapon. Phosphex has the capacity to burn without oxygen and with next to no fuel source.

Phosphorite - Wikipedia

Phosphorite, phosphate rock or rock phosphate is a non- detrital sedimentary rock that contains high amounts of phosphate minerals. The phosphate content of phosphorite (or grade of phosphate rock) varies greatly, from 4% to 20% phosphorus pentoxide (P 2 O 5 ). Marketed phosphate rock is enriched ("beneficiated") to at least 28%, often more than ...

Phosphates and Superphosphates - Cargo Handbook - the ...

Rock Phosphate Rock phosphate is a rock form of naturally occurring phosphate fertilizer which is formed from sea floor sediments of ancient and current day seas. It is reported as a percentage of phosphorus pentoxide (P 2 O 5). Phosphates can be deposited in a wide range of marine depositional environments. Normally phosphates are deposited in very shallow, near shore marine or low energy environments. Rock phosphate …

Reserves and Resources DC World Phosphate Rock

Previous estimates of phosphate rock reserves range from 15,000 mmt to over 1,000,000 mmt, while estimates of phosphate rock resources range from about 91,000 mmt to over 1,000,000 mmt. Using the available literature, the reserves of various countries were assessed in terms of reserves of concentrate. The IFDC estimate of worldwide

Radiometric analysis of Hazara phosphate rock and ...

01.01.1998· CONCLUSION The specific gamma ray activities due to 40K, 226Ra and 232Th in phosphate rock samples, collected from various localities of Hazara Division, and different brands of locally prepared and imported fertilizer in Pakistan, have been measured using the gamma spectroscopy technique. The 226Ra content is very high and is found to vary from 307-7 Bqkg^1 to 617-5 Bqkg^1. …

238 232Th, 226Ra, and 40K in the Production Cycle of ...

Background: Phosphate rock and its by-product are widely used in various industries to pro-duce phosphoric acid, gypsum, gypsum board, and fertilizer. Owing to its high level of natural radioactive nuclides (e.g., 238U and 226Ra), the radiological safety of workers who work with phosphate rock should be systematically managed. In this study, 238U, 232Th, 226Ra, and 40K lev-els were …

Radioactive rock phosphate: the feed stock of …

The concentrations of 40K and 232Th were of the order of background level on the Earth's crust. Chemical analysis for concentration of different constituents in rock phosphate was also carried out. The higher the concentrations of P2O5 and K2O were, the higher the specific activities of 226Ra and 40K were, respectively, in the rocks under study ...

40K Ra ( U) 232Th (228Ra) Raw materials – part 1 MIN MAX ...

Update for the Appendix I - Activity concentrations for materials that could be encountered at international borders, from: The trade in radioactive materials - potential problems and possible solutions, NORM-V Proceedings, IAEA, 2008, pp.437-453 6 Raw materials – part 6 40K 226Ra (238U) 232Th (228Ra) MIN MAX MIN MAX MIN MAX Phosphate rock (India) n/a 0.033 1.7 n/a

40K, 226Ra AND 228Ra SERIES IN BOVINE AND POULTRY …

40K, 226Ra, 228Th and 228Ra activity in Feed Samples with deviation within 95% confidence rating. ... Studies from literature indicate that when the phosphate rock is digested with sulphuric acid, it leads to little amounts of 226Ra in DCP (<2%) (Roessler (1990) and Rutherford (1996)) Figure 3 presents a comparison among 226Ra activity values of the literature and the present work. Figure 3 ...

The natural radioactivity in phosphate deposits from …

27.01.1995· Table 2 Activity concentrations of natural thorium and 40K in soil and ground rock phosphate (Bq/kg) Location Item 232 230Th 228Th 40K Th Uro Rock Phosphate 2.51 2389.68 4.47 51.70 Kurun Rock phosphate 0.83 523.95 1.64 23.00 Arkuri Soil 43.19 46.64 43.88 688.00 El Ban Jadeed Soil 19.64 27.86 19.32 279.00 Khour Abu Habil Soil 29.53 33.63 30.25 180.00 Dumpir Soil …

(PDF) Radiometric analysis of Hazara phosphate rock …

CONCLUSION The specific gamma ray activities due to 40K, 226Ra and 232Th in phosphate rock samples, collected from various localities of Hazara Division, and different brands of locally prepared and imported fertilizer in Pakistan, have been measured using the gamma spectroscopy technique. The 226Ra content is very high and is found to vary from 307.7 Bqkg-’ to 617.5 Bq kg-‘. This can ...

Distribution of 226Ra, 232Th and 40K in soils and sugar ...

01.06.2009· The natural radioactivity of the rock phosphate, phosphatic products and their environmental implications. The Science of Total Environment, 133 (1993), pp. 99-110. Article Download PDF View Record in Scopus Google Scholar. Manolopoulou et al., 2003. M. Manolopoulou, St. Stoulos, D. Mironaki, C. Papastefanou. A new technique for the accurate measurement of 226Ra by gamma …

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Phosphate rock is the starting raw material for all phosphate products. It can be of sedimentary, volcanic or biological origin. Concentrations of 232Th series and 40K in phosphate rocks of all types are similar to those observed normally in soil, whereas the concentration of 238U and its decay products tend to be elevated in phosphate deposits of sedimentary origin. A typical concentration of ...

Measurement of radioactivity concentration in soil …

01.01.2018· The rock phosphate storage facility at Richards Bay currently has a capacity of about 80,000 tons (Foskor, 2012). ... 232Th, and 40K by pot-grown rice plants. Pollution, 2 (1) (2016), pp. 1-10. View Record in Scopus Google Scholar. Arafa, 2004. W. Arafa. Specific activity and hazards of granite samples collected from the Eastern Desert of Egypt . Journal of Environmental Radioactivity, 75 (3 ...

40K Ra ( U) 232Th (228Ra) Raw materials – part 1 MIN MAX ...

Update for the Appendix I - Activity concentrations for materials that could be encountered at international borders, from: The trade in radioactive materials - potential problems and possible solutions, NORM-V Proceedings, IAEA, 2008, pp.437-453 6 Raw materials – part 6 40K 226Ra (238U) 232Th (228Ra) MIN MAX MIN MAX MIN MAX Phosphate rock (India) n/a 0.033 1.7 n/a

40K, 226Ra AND 228Ra SERIES IN BOVINE AND POULTRY …

40K, 226Ra, 228Th and 228Ra activity in Feed Samples with deviation within 95% confidence rating. ... Studies from literature indicate that when the phosphate rock is digested with sulphuric acid, it leads to little amounts of 226Ra in DCP (<2%) (Roessler (1990) and Rutherford (1996)) Figure 3 presents a comparison among 226Ra activity values of the literature and the present work. Figure 3 ...

The natural radioactivity in phosphate deposits from …

27.01.1995· Table 2 Activity concentrations of natural thorium and 40K in soil and ground rock phosphate (Bq/kg) Location Item 232 230Th 228Th 40K Th Uro Rock Phosphate 2.51 2389.68 4.47 51.70 Kurun Rock phosphate 0.83 523.95 1.64 23.00 Arkuri Soil 43.19 46.64 43.88 688.00 El Ban Jadeed Soil 19.64 27.86 19.32 279.00 Khour Abu Habil Soil 29.53 33.63 30.25 180.00 Dumpir Soil …

Radioactivity and heavy metal composition of Nigerian ...

Phosphate rock samples collected from the Dange Formation within the Sokoto basin were analyzed for trace element constituents using instrumental neutron activation analysis (INAA) and X-ray fluorescence analysis (XRFA) techniques, while natural activity concentrations due to 235U, 232Th, and 40K were determined by gamma-ray spectrometry. The analytical results show that the average ...

Distribution of 226Ra, 232Th and 40K in soils and sugar ...

01.06.2009· The natural radioactivity of the rock phosphate, phosphatic products and their environmental implications. The Science of Total Environment, 133 (1993), pp. 99-110. Article Download PDF View Record in Scopus Google Scholar. Manolopoulou et al., 2003. M. Manolopoulou, St. Stoulos, D. Mironaki, C. Papastefanou. A new technique for the accurate measurement of 226Ra by gamma …

Phosphate fertilizers. Abstracts from 1990 to present ...

The activity concentration of 238U, 234U, 226Ra and 40K in Tapira phosphate rocks is within the world range for these rock types. The 232Th activity concentration is higher than the mean reported in phosphate rocks. A value of 2184 nGy h-1 was obtained for the exposure dose rate in Tapira phosphate deposit area, which is indicative of a high background radiation area. The flotation …

Measurement of radioactivity concentration in soil …

01.01.2018· The rock phosphate storage facility at Richards Bay currently has a capacity of about 80,000 tons (Foskor, 2012). ... 232Th, and 40K by pot-grown rice plants. Pollution, 2 (1) (2016), pp. 1-10. View Record in Scopus Google Scholar. Arafa, 2004. W. Arafa. Specific activity and hazards of granite samples collected from the Eastern Desert of Egypt . Journal of Environmental Radioactivity, 75 (3 ...

Pierre Courjault-Radé - Academia.edu

This work is a first contribution to the knowledge of natural radionuclides (226Ra, 238U, 40K, and 232Th) activities in phosphate rock (NORM), phosphogypsum, and phosphogypsum foam (TENORM) from the coastal fertilizer plants of Gabes (Southeastern Tunisia) and the assessment of their radiation hazards on human health and the surrounding environment. In the three studied materials, activities ...

The natural radioactivity of the rock phosphates ...

28.05.1993· The radioactivity of the Minjingu phosphorite deposit in Arusha-Tanzania was determined by radiochemical and radiometric methods of analysis. The main radioisotopes analysed in the rock phosphate, phosphate concentrate (ground rock phosphate), phosphate fertilizers (superphosphate, and triple superphosphate) and phosphogypsum were 238 U, 235 U, 232 Th and their progenies.

Investigations on the activity concentrations of 238U ...

12.08.2008· Phosphate rock of sedimentary origin and fertilizer samples were collected from the Phosphatic Fertilizer Complex of Aqaba. Sampling period was 1 week. Phosphogypsum samples were collected from several piles in the same day. All samples were dried for 24 h at 60°C. Each sample was then homogenized thoroughly with a mortar and pestle, and was split into two portions. The first …