Bq Kg-1 For 40K Research Articles

Assessment Of Natural Radioactivity Level And Radiation Hazard Parameters In The Terrestrial Environment Of Eloor Island, Kerala

The present study is aimed at measuring the concentration of primordial radionuclides in the soil samples of Eloor Island, an industrial area in Ernakulum District and evaluating the radiation exposure to the local population. The ambient radiation exposure rate was measured using portable scintillometer survey meter and the activity concentration of 232Th, 238U and 40K in the soil samples were analyzed using (5×4)” NaI(Tl) gamma spectrometer. The exposure rate measured using survey meter varied from 63 nGyh-1 to 374 nGyh-1. The activity concentration of 232Th, 238U and 40K in soil samples ranged from 44.8 Bq kg-1 to 792.8 Bqkg-1 for 232Th, 8 Bqkg-1 to 445.5 Bqkg-1 for 238U and 129 Bqkg-1 to 1160.5 Bqkg-1 for 40K. Hence the absorbed gamma dose and radiation hazard indices due to natural environmental radiation was done. The study showed no significant impact due to the NORM Industries in the Eloor Industrial region.

Measurement of Radioactivity Levels in Daily Intake Foods of Erbil City Inhabitants

This work investigates the natural 226Ra,232Th,40K, 222Rn,220Rn and man-made137Cs radionuclides
 in foodstuff elements consumed by Iraqi Kurdistan region population (Erbil).The measurements were
 carried out by using a high efficiency NaI(TI) gamma-ray spectrometerandCR-39 solid state nuclear
 track detectors. The estimated average activity concentrations in foodstuff were found to be0.17Bq kg-1
 for 226Ra, 0.183 Bq.kg-1 for 232Th, 515.5Bq kg-1 for 40K, 0.11Bq.kg-1 for 137Cs and 108.46Bq.m-3
 for 222Rn.The total annual internal dose resulting from ingestion of radioisotopes in foodstuff was ranged
 from 0.01μSv.year-1 to 270.8μSv.year-1whichlies within the standard safety range of consumption.

Radiological Monitoring of Borehole in Dei-Dei, Abuja, North Central Nigeria

Inhabitants in Dei-Dei area of Abuja consume groundwater that recharges from different lithologic units of subsurface structures due to inadequate public water supply.The water is consumed untreated and during drilling, it cuts across so many rock formations, to extents constitute radioactive elements which are to be evaluated. Vertical Electric Sounding and Shuttle Radar Topography mission was used to determine the structure of electric conductivity and map lineaments.Hydrogeologically motivated borehole with geophysical log data was drilled. Activity concentrations were analysed using high resolution co-axial HPGe gamma spectrometer system. The activity concentrations ranges from 45± 2 to 98 ± 6 Bq kg-1 for 232Th, 18 ± 2 to 37 ± 4 Bq kg-1 for 238U and 236 ± 32 Bq kg-1 to 1195±151 Bq kg-1 for 40K. Structurally, fractured interconnectivity attributed to low levels in some layers. Activity levels are within the limits, requires research within groundwater activity levels and rock geochemistry.

Studies of the Terrestrial outdoor Gamma Dose Rate Levels in Ogun-Osun River Basins Development Authority Headquarters, Abeokuta, Nigeria

Problem statement: The natural radioactivity levels in the soils of Ogun-Osun River Basins Development Authority Headquarters, (O-ORBDA HQ) Abeokuta, South-Western part of Nigeria were measured. Approach: (O-ORBDA HQ) is a parastatal of Federal Ministry of Water Resources and Rural Development in Nigeria charged with the responsibility for the development and management of the water resources in its area of coverage. The area of the site was divided into fifteen segments and soil samples were collected at a depth of about 10cm at the intersection of these lines. Results: Global Positioning System (GPS) was used to obtain the geographical position of each sample point. NaI (Tl) scintillation detector coupled with a Canberra series 100 plus MCA was used as the detecting device for the gamma scintillation spectroscopy. The average activity concentrations obtained for the three radionuclides were 896.12± 274.48 Bq kg-1 for 40K, 13.93±2.36 Bq kg-1 for 238U and 18.67±5.06 Bq kg-1 for 232Th. The average values of the absorbed dose rates in air of each radionuclide were found to be 37.64±11.53 nGy h-1 for 40K, 5.98±1.10 nGy h-1 for 238U and 12.44±3.37 nGy h-1 for 232Th. Conclusion/Recommendations: The baseline average outdoor annual effective dose equivalent in O-ORBDA HQ due to the radioactivity concentrations was found to be 68.74±19.51 μSv year-1. This value is less than the world average of 70 μSv year-1 specified by UNSCEAR for an outdoor effective dose. Hence the probability of occurence of any of the health effects of radiation is low. Since no artificial radionuclides was detected, this represents the baseline value of natural radioactivity.

Assessment of Radiation Dose Rates in the High Terrestrial Gamma Radiation Area of Selama District, Perak, Malaysia

Survey of terrestrial gamma radiation (TGR) dose rates have been conducted in Selama district, Perak, Malaysia. Themean value of TGR dose rate outdoor in Selama is (273 ± 133) nGy h-1. For the habited land, the mean TGR dose ratesoutdoor and indoor are (205 ± 59) nGy h-1 and (212± 64) nGy h-1 respectively. They contribute fatal cancer risk of 6.4 x10-5 per year to an individual in the area. The activity concentrations of 238U, 232Th, and 40K in the soil samples wereanalysed using a high resolution co-axial HPGe gamma ray spectrometer system. The values obtained range from 57 Bqkg-1 to 364 Bq kg-1 with the mean value of (178±95) Bq kg-1 for 238U; 207 Bq kg-1 to 625 Bq kg-1 with the mean value of(353±143) Bq kg-1 for 232Th, and 26 Bq kg-1 to 601 Bq kg-1 with the mean values of (273±133) Bq kg-1 for 40K.

Natural Radionuclides Content of some Local Cereals in Akura, South Western Nigeria

The natural radionuclides contents of cowpea (Vigna unguiculata L. walp). Guiea corn (Sorghum bicolor L), rice (Oryza sativa L) and soyabean (Gycin max L) have been investigated. The specific activites ranged from 36.4 ± 13.5 Bqkg-1 to 186.9 ± 23.1 Bqkg-1 for 40K, 0.2 ± 0.1 Bqkg-1 to 1.4 ± 0.5 Bqkg-1 for 235U, and 0.3 ± 0.1 Bqkg-1 to 1.8 ± 0.7 Bqkg-1 for 232Th. Cesium – 137 was not detected in any of the cereals investigated.

Comparison on in situ and laboratory gamma-ray spectroscopy of terrestrial gamma radiation in Ibadan, Southwestern Nigeria

In situ - ray spectroscopic method of measeruments, using the calibration factor by Zombori et al, and laboratory method for soil samples were carried out in Ibadan, SW Nigeria. The average specific activities of 40K, 238U and 232Th in the soil were 299.0 16.5 Bqkg-1, 40.0 5.8 Bqkg-1 and 95.0 7.8 Bqkg-1, respectively, by in situ measurements, while for the laboratory measurements, the specific activities were found to be 355.0 19.7 Bqkg-1 for 40K, 31.0 5.9 Bqkg-1 for 238U and 63.0 7.5 Bqkg-1 for 232Th. Statistical analysis using F- hypothesis test of microsoft excel 5.0 analysis toolpak gave F-values to be 0.32, 0.52 and 0.00, respectively, which indicated that the radionuclides were not site dependent. The comparison shows a correlation of 0.65, 0.59 and 0.63 respectively, for 40K, 238U and 232Th. Key words : gamma - ray; calibration; soil; activity; radionuclide (Global Journal of Pure and Applied Sciences: 2002 8(4): 507-512)