scholarly journals Distribution of natural radionuclides and radon concentration in the riverine environs of Cauvery, South India

2018 ◽  
Vol 16 (3) ◽  
pp. 476-486 ◽  
Author(s):  
C. S. Kaliprasad ◽  
Y. Narayana
Keyword(s):  
South India ◽  
Extreme Values ◽  
Gamma Spectroscopy ◽  
Natural Radionuclides ◽  
Gamma Ray Spectrometry ◽  
Radon Emanation ◽  
Mean Values ◽  
Can Technique ◽  
226Ra Activity ◽  
The Mean

Abstract Systematic studies were carried out to understand the distribution of natural radionuclides in sediments and radon in water in the riverine environs of Cauvery, one of the major rivers of South India. The activity of radionuclides in the sediment was measured by gamma ray spectrometry. The radon emanation from the sediment was measured by the sealed ‘can technique’ and the radon in the water was measured using the RAD-7 instrument. The mean values of 40 K, 226Ra, and 232Th in the sediment samples were found to be 297.3 ± 4.16 Bq kg−1, 75.1 ± 2.64 Bq kg−1, and 85.5 ± 2.62 Bq kg−1, respectively. The mean activity of radon, radon exhalation rate, and radium content were found to be 135.68 Bq m−3, 327.1 mBq m−1 h−1, and 133.03 mBq kg−1, respectively. The radon in the water ranged from 0.19 kBq m−3 to 1.40 kBq m−3. The hyper pure germanium gamma spectroscopy measured via 226Ra activity and the radon activity measured by the passive can technique showed good correlation. The mean value of radon in the water was within the internationally recommended level. The sediment was considered safe for the purpose of construction, except for some extreme values, and the water was deemed safe for drinking.

scholarly journals EVALUATION OF RADIOACTIVITY IN THE PHOSPHOGYPSUM STOCKPILE OF “HIV” VELES, THE REPUBLIC OF NORTH MACEDONIA

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Mitko Janchev ◽  
Ivan Boev ◽  
Zdenka Stojanovska ◽  
Blazo Boev
Keyword(s):  
Natural Radionuclides ◽  
Radiation Risk ◽  
Waste Product ◽  
Gross Alpha ◽  
Mean Values ◽  
The Mean ◽  
Specific Activities ◽  
The Republic ◽  
High Concentrations

The production of phosphoric acid from natural phosphate ore generates an industrial waste product named phosphogypsum. Phosphogypsum contains considerable amounts of natural radionuclides from the 238U chain, originating from the ore but enriched during the technological process. In order to perform radiological characterization of the “HIV” (Chemical Industry Veles) phosphogypsum stockpile, five phosphogypsum samples were collected and analyzed. The mean values of gross alpha and beta specific activities ± standard deviation values were: (950±104) Bq/kg and (1694±220) Bq/kg, respectively. Further analysis showed increased gross activities of radionuclides of the 238U chain, while the radionuclides of the 232Th chain and 40K were below the detection limit. The mean values of the specific activities of 238U and 226Ra were (360±55) Bq/kg and (280±84) Bq/kg, respectively. The estimated annual outdoor effective dose, at 1m received by adults was 0.25 mSv/y, which is below a dose limit of 1 mSv/y for members of general public. The results obtained in this study show that radionuclides, although present in relatively high concentrations in the phosphogypsum pile, do not imply an increased external radiation risk for members of the population. The possible use of phosphogypsum in civil construction and agriculture may not be excluded if conditions of prior good planning taking into account the radionuclides activities exist.

scholarly journals Radiological Risks from Natural Radionuclides in Surface Soil of Agbara Industrial Area, Ogun State, Nigeria

2021 ◽  
Vol 25 (5) ◽  
pp. 733-739
Author(s):  
A.K. Ademola
Keyword(s):  
Gamma Ray ◽  
Natural Radionuclides ◽  
Contamination Factor ◽  
Industrial Area ◽  
World Health ◽  
Pollution Level ◽  
Gamma Ray Spectrometry ◽  
Ogun State ◽  
The Mean ◽  
Health Organization

Measurement of natural radioactivity in soil samples from the Agbara Industrial area, Nigeria, was measured using gamma-ray spectrometry with NaI (Tl) detector. The concentration of 238U ranged from 10.21±3.50 to 67.41±18.2 Bqkg-1, from 26.43±10.8 to 96.24±18.81 for 232Th and from 298.65±60.70 to 840.52±150.25 Bqkg-1 for 40K. Their means were, respectively, 28.69±11.00, 45.86±10.25, and 481.22±106.17 Bqkg-1 . Annual effective varies from 0.08 to 0.16 mSv y-1 with a mean of 0.11 mSv y-1. The mean contamination factor was 0.87 for 228Ra, 1.02 for 232Th and, 1.15 for 40K.The soil is moderately polluted with 232Th and 40K. The Pollution Level Index indicates a drop in soil quality in about 50% of the areas covered. The mean cancer risk (0.4 x 10-3 ) obtained in this study is above the World Health Organization limit, indicating a high probability for inhabitants to develop lung cancer in the long term when a lifetime is spent in this area under study.

scholarly journals Effect of Fukushima Accident on Fishes and Fish Like other Foods Collected from the Bay of Bengal and Karnaphuli River, Bangladesh

2018 ◽  
Vol 40 (1) ◽  
pp. 75-96
Author(s):  
Akhi Das Gupta ◽  
Md Kowsar Alam ◽  
Shyamal Ranjan Chakraborty ◽  
AKM Rezaur Rahman ◽  
SI Bhuian ◽  
...  
Keyword(s):  
Bay Of Bengal ◽  
Activity Concentration ◽  
Specific Activity ◽  
Gamma Spectroscopy ◽  
Natural Radionuclides ◽  
Research Work ◽  
Hazard Index ◽  
Artificial Radionuclide ◽  
Fukushima Accident ◽  
The Mean

An experiment was carried out to assess the radiological exposure due to the intake of fishes and fish like foods from some common estuary (Karnaphuli River) and Marine (Bay of Bengal) contaminated by Fukushima Reactor Accident, if any, by using gamma spectroscopy. The analysis was done to estimate the radioactivity concentrations due to natural radionuclides namely 238U, 232Th and 40K and artificial radionuclide 137Cs in Karnaphuli estuary and Chittagong city adjoining Bay of Bengal fish and fish-like samples. The activity concentration for 238U in all the samples ranged from 0.10615 ± 0.0000 to 2.4767 ± 0.0005 Bq.kg-1 with the mean of 0.6109 ± 0.0001 Bq.kg-1. The Activity of 232Th ranged from 0.0009 ± 0.0000 to 0.0273 ± 0.0000 Bq.kg-1 with the mean of 0.0074 ± 0.0000 Bq.kg-1. The activity concentration for 40K was found to be in the range from 1.5516 ± 0.0311 to 74.8658 ± 0.2532 Bq.kg-1 with the mean of 24.9533 ± 0.0702 Bq.kg-1. The artificial radionuclide 137Cs was not found in any of the samples. The specific activity values for most of the sample were within the permissible limits. The average effective dose and internal hazard index due to consumption of those fishes and fish-like foods was found to be 0.1 mSv.y-1 and 0.0085 ± 0.0000 mSv.y-1 respectively. The research work showed that the consumers of concerned fishes and fish-like foods of the Chittagong area have no risk of radioactivity ingestion even though no amount of radiation is assumed to be totally safe. The Chittagong Univ. J. Sci. 40(1) : 75-96, 2018

scholarly journals Natural radioactivity in the soil of Thoulakhom district in Vientiane province, Laos

2019 ◽  
Vol 2 (4) ◽  
pp. 119-125
Author(s):  
Sonexay Xayheungsy ◽  
Khiem Hong Le
Keyword(s):  
Activity Concentration ◽  
Democratic Republic ◽  
Surface Soil ◽  
Natural Radionuclides ◽  
Soil Samples ◽  
Radiation Hazard ◽  
Gamma Spectrometer ◽  
Mean Values ◽  
Activity Concentrations ◽  
The Mean

Results of the first investigation of the activity concentration of the surface soil samples collected at various locations of Thoulakhom district of Vientiane province of Laos People's Democratic Republic (PDR) are presented in this work. The activity concentration of the natural radionuclides 226Ra, 232Th and 40K in the soil samples were determined by gamma spectrometer using a highenergy resolution semiconductor detector HPGe. The activity concentrations of the natural radionuclides were in the range from 11.28 to 31.46 with the mean of 21.76 Bq.kg-1 for 226Ra, from 7.13 to 44.47 with the mean of 21.85 Bq.kg-1 for 232Th and from 8.96 to 581.52 with the mean of 112.89 Bq.kg-1 for 40K. These mean values of the activity concentration were lower than the average worldwide ones, which were 33, 45 and 420 Bq.kg-1 for 226Ra, 232Th, and 40K, respectively. The results indicate dthat the radiation hazard from natural 226Ra, 232Th, and 40K radionuclides in all investigated soil samples taken from area under investigation in this work was not significant.

scholarly journals Rainfall distribution over Delhi State during monsoon

MAUSAM ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 57-66
Author(s):  
D. A. MOOLEY
Keyword(s):  
Spatial Distribution ◽  
Heavy Rainfall ◽  
Extreme Values ◽  
Monsoon Season ◽  
The State ◽  
Rainfall Distribution ◽  
Mean Values ◽  
The Mean ◽  
Rainy Days

Based on the data for the period 1939-1954, the mean values of rainfall and number of rainy days during the, monsoon season at the various raingauge stations as well as the extreme values of these have been given; spatial distribution of heavy, rainfall over the State and the incidence of heavy rainfall at the various location have been studied. From a study of the synoptic charts on days prior to the days on which local heavy rainfall over was reported, an attempt has been made to indicate the topical synoptic situations which usually lead to local heavy rainfall over Delhi State during the next 24hours.Typical situation ‘have been illustrated by charts.  

Natural radioactivity in marine sediment of Khor- Abdulla Northern west of the Arabian Gulf

2015 ◽  
Vol 9 (1) ◽  
pp. 2340-2347 ◽  
Author(s):  
Abdul Subber ◽  
Munaf Qasim Jaber ◽  
Noori H.N. Al-Hashmi
Keyword(s):  
Gamma Spectroscopy ◽  
Natural Radionuclides ◽  
Arabian Gulf ◽  
Special Equipment ◽  
Sediment Samples ◽  
Dose Rates ◽  
Naturally Occurring ◽  
Naturally Occurring Radionuclides ◽  
Radium Equivalent ◽  
The Mean

This work presents measurements of natural radionuclides (238U, 226Ra, 232Th and 40K) in the sea sediment using gamma spectroscopy. The sediment samples were collected from coastal and deep water using special equipment for this purpose. This work was performed in Khor-Abdulla, northern west of the Arabian Gulf to establish the baseline data level for naturally occurring radionuclides in the study area and will be useful for tracking and assessing any accentual pollution in the marine environment in the region. The average values of 232Th, 238U,226Ra, 40K are 5.6 Bq/kg, 7.2 Bq/kg, 44.4 Bq/kg  and 293.9 Bq/kg respectively. It is found that,the mean radium equivalent Raeq and effective dose rates are  84.5 Bq/kg and 0.046 mSv/y respectively and they are well below the recommended limit of international committees.

scholarly journals Effect of fertilization on the distribution of root phytomass and the yield of meadow stands

2011 ◽  
Vol 50 (No. 3) ◽  
pp. 116-121 ◽  
Author(s):  
J. Mrkvička ◽  
M. Veselá ◽  
M. Skála
Keyword(s):  
Dry Matter ◽  
Extreme Values ◽  
Soil Depth ◽  
Soil Layer ◽  
Dry Mass ◽  
Root Weight ◽  
Root Mass ◽  
Mean Values ◽  
The Mean ◽  
Pk Fertilization

In 1998&ndash;2000 the effect of fertilization on the quantity, stratification of root phytomass and yields of dry mass on mesophyte meadow stands was studied. The root dry matter in the soil depth of 0.0&ndash;0.25 m was oscillated and the extreme values in individual samplings were found in 1998 (402&ndash;702 g/m<sup>2</sup>). In 1999 and 2000 the oscillating minimum and maximum values of dry root phytomass in all were 418&ndash;622 g/m<sup>2</sup>, 423&ndash;678 g/m<sup>2</sup>,respectively. The mean values of dry root mass in unfertilized treatments ranged from 484 to 540 g/m<sup>2</sup>. PK increased the values insubstantially (507&ndash;565 g/m<sup>2</sup>). The higher nitrogen dose (200 kg/ha) decreased predominantly the total quantity of dry root phytomass by 36&ndash;102% was found in the control treatments, compared in the yield of dry harvestable above-ground mass. In the systematic P<sub>40</sub>K<sub>100</sub> fertilization the root weight in slightly moistenyears (1998 and 2000) was by 18&ndash;70% higher in comparison with the dry year 1999 when the root mass was 24% less. In the fertilization 200 kg/ha N(+PK) in the first two years of studies the root phytomass was less by 12% and 38% compared with the yield of the dry meadow fodder. The mean representation of root phytomass in the soil layer 0.0&ndash;0.1 m was in 1999&ndash;2000 in the control and PK treatments nearly the same, and created 88% from the total quantity. N(+PK) fertilization caused the displacement of the root phytomass towards the surface.

scholarly journals Natural Radionuclides and Radon Exhalation Rate in the Soils of Cauvery River Basin

2017 ◽  
Vol 10 ◽  
pp. 117862211774694 ◽  
Author(s):  
CS Kaliprasad ◽  
PR Vinutha ◽  
Y Narayana
Keyword(s):  
Gamma Ray ◽  
Natural Radionuclides ◽  
Soil Samples ◽  
Radon Exhalation Rate ◽  
Exhalation Rate ◽  
Cauvery River ◽  
Mean Values ◽  
Radon Exhalation ◽  
The Mean ◽  
Recommended Level

In this study, systematic measurement of activity concentrations of 40K, 226Ra, and 232Th and radon exhalation rate has been done in soil samples of Cauvery River environment. The activity was measured using HPGe gamma-ray spectrometer, and the mean values of 40K, 226Ra, and 232Th in the soil samples were found to be 182 ± 4, 34 ± 2, and 19 ± 1 Bq kg−1, respectively. The radon exhalation rate was measured by “Can technique” using SSNTD (LR-115) films. The mean values of radium concentration, surface exhalation, and mass exhalation rate were found to be 118.95, 293.61, and 108.53 mBq kg−1 h−1, respectively. The radiological hazard indices due to natural radioactivity were calculated and compared with international recommended values, which are lower than the recommended level. The radon exhalation rate is lower than the recommended level.

scholarly journals Assessment of Natural Radioactivity Levels and Radiation Hazards in Agricultural and Virgin Soil in the State of Kedah, North of Malaysia

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ghazwa Alzubaidi ◽  
Fauziah B. S. Hamid ◽  
I. Abdul Rahman
Keyword(s):  
Gamma Ray ◽  
Agricultural Soils ◽  
Soil Depth ◽  
Hazard Index ◽  
Absorbed Dose ◽  
Gamma Ray Spectrometry ◽  
Virgin Soil ◽  
Radium Equivalent Activity ◽  
Mean Values ◽  
The Mean

The activity concentrations of naturally occurring radionuclides226Ra,232Th, and40K were determined in 30 agricultural and virgin soil samples randomly collected from Kedah, north of Malaysia, at a fertile soil depth of 0–30 cm. Gamma-ray spectrometry was applied using high-purity germanium (HPGe) gamma-ray detector and a PC-based MCA. The mean radioactivity concentrations of226Ra,232Th, and40K were found to be 102.08 ± 3.96, 133.96 ± 2.92, and 325.87 ± 9.83 Bq kg−1, respectively, in agricultural soils and 65.24 ± 2.00, 83.39 ± 2.27, and 136.98 ± 9.76 Bq kg−1, respectively, in virgin soils. The radioactivity concentrations in agricultural soils are higher than those in virgin soils and compared with those reported in other countries. The mean values of radium equivalent activity (Raeq), absorbed dose ratesD(nGy h−1), annual effective dose equivalent, and external hazard index (Hex) are 458.785 Bq kg−1, 141.62 nGy h−1, and 0.169 mSv y−1, respectively, in agricultural soils and 214.293 Bq kg−1, 87.47 nGy h−1, and 0.106 mSv y−1, respectively, in virgin soils, with averageHexof 0.525. Results were discussed and compared with those reported in similar studies and with internationally recommended values.

scholarly journals CT pelvimetry of variant pelvis and child birth prognosis

2018 ◽  
Vol 7 (2) ◽  
pp. 1292-1297
Author(s):  
Christel Marie Lalèyè ◽  
Simon A. Azonbakin ◽  
Vincent Delmas ◽  
Augustin-Karl Agossou-Voyèmè ◽  
Richard Douard ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Vaginal Delivery ◽  
Extreme Values ◽  
Threshold Values ◽  
Pelvic Brim ◽  
Mean Values ◽  
X Ray ◽  
Pelvic Inlet ◽  
Median Diameter ◽  
The Mean

The aim of this study was to determine the threshold values of pelvimetry by scanning and to evaluate the ability of the pelvimetry alone to diagnose a fetal-pelvic disproportion. It was an observational retrospective study on 410 pregnant women who had a scanner pelvimetry for any reasons. Based on the fetal presentations, two subgroups (breech and cephalic -others) have been defined. Measurements of the main obstetric diameters (promonto-retropubic, median transverse and dual sciatica) were taken. The 5th and 10th percentile were calculated as well as the 90th and 95th to determine the threshold values of pelvimetry by scanner. The scanner values found on CT were compared with the standard X ray pelvimetry values. Referring to extreme values obtained by pelvimetry scanner, some pathological pelvic brim were reconstructed in 3D. Moreover, the delivery prognostic was analyzed by crossing the pelvic inlet dimensions (Magnin index) and pelvic outlet dimensions (bi-sciatic diameter) with the outcome of the delivery. The mean values of the scanno-pelvimetry measurement in our series were:m12,39 cm (± 1) for the promonto-retropubic diameter, 12.88 cm (± 1.01) for the transverse median diameter and 11 cm (± 1.32) for the bi-sciatic diameter. These measurements provided an accuracy less than 1 cm compared to the standard ray pelvimetry. Although Magnin index at 23 allows a vaginal delivery, 51% of oursample have failed. Moreover, for the Magnin index at 24 and 25, the vaginal delivery failure rate remains high:45.1% and 39.61% respectively. Compared to classical pelvimetry, pelvimetry by scanner provides additional precision and allows to study the geometry of the basin. However, the pelvimetry alone could not be effective to establish the prognosis of vaginal delivery.Keywords: scanno-pelvimetry, prognosis, delivery

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