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  Access statistics : Table of Contents
   2017| January-March  | Volume 40 | Issue 1  
    Online since April 24, 2017

 
 
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ORIGINAL ARTICLES
Measurement and validation of uranium isotope ratio in uranium ore for isotopic fingerprinting
Suchismita Mishra, Sarata Kumar Sahoo, Probal Chaudhury, KS Pradeepkumar
January-March 2017, 40(1):3-8
DOI:10.4103/rpe.RPE_36_16  
Accurate determination of uranium isotope ratio can act as an efficient fingerprint in the nuclear forensics to identify source and intended use of illicit trafficking of uranium material. In this context, a rapid chemical separation technique to isolate uranium from uranium ore sample was developed using commercial extraction chromatographic resin. Uranium isotope ratio was measured using thermal ionization mass spectrometry (TIMS). Standard reference material (NBS U010) was used for validating the accuracy and precision of isotope ratio measurement by TIMS. The method is successfully applied to a natural ore (uraninite ore) for the determination of naturally occurring uranium isotope ratio.
  747 141 -
Assessment of natural radioactivity and associated radiation indices in soil samples from the high background radiation area, Kanyakumari district, Tamil Nadu, India
AK Ajithra, B Venkatraman, MT Jose, S Chandrasekar, G Shanthi
January-March 2017, 40(1):27-33
DOI:10.4103/rpe.RPE_31_16  
Assessment of natural radioactivity is very important from different points of view, especially for assessment of radiation exposure to human. In the present study, natural radionuclide concentrations of 238U, 232Th, and 40K were measured by gamma spectrometry using HPGe detector in soil samples collected from Southwest coast of Kanyakumari district, Tamil Nadu. The radiological index parameters due to natural radionuclides such as radium equivalent activity, absorbed dose rate, annual effective dose rate, external hazard index, internal hazard index, and gamma index were calculated for the soil samples. All the calculated radiological index values are higher than world average values and the recommended safety limits. Multivariate statistical techniques such as Pearson correlation, principal component analysis, and cluster analysis were applied to know the relation between radionuclides and radiological parameters and to study the spatial distribution of radionuclides.
  569 128 1
EDITORIAL
Radiological protection issues of itinerant workers
Pushparaja
January-March 2017, 40(1):1-2
DOI:10.4103/rpe.RPE_19_17  
  578 96 -
ORIGINAL ARTICLES
Study on radon concentration in groundwater of Sira and Tiptur taluk of Tumkur district, Karnataka, India
MB Karthik Kumar, N Nagaiah, Gladys Mathews, MR Ambika
January-March 2017, 40(1):13-17
DOI:10.4103/rpe.RPE_54_16  
A study on radon concentration in groundwater samples collected from different villages of Sira and Tiptur taluk of Tumkur district has been conducted using emanometry method, and the effective dose to the public was estimated. The geometric mean of the activity concentration of dissolved radon was found to be 39.13 ± 1.99 and 3.78 ± 0.05 Bq/L for Sira and Tiptur taluk, respectively. The total annual effective dose for adult, children, and infants was also estimated and was found to be 0.20, 0.18, and 0.31 mSv/year, respectively, in Sira taluk and 0.019, 0.017, and 0.029 mSv/year in Tiptur taluk, respectively. Water samples were also analyzed for the physicochemical parameters to assess the quality of drinking water and also to understand the influence of these parameters on dissolved radon concentration. Poor correlation was observed between dissolved radon concentration and pH in both taluks.
  507 95 -
Measurement of natural radioactivity in and around Chennai Coast, East Coast of Tamil Nadu, India, using gamma ray spectrometry
M Tholkappian, A Chandrasekaran, N Harikrishnan, Durai Ganesh, G Elango, R Ravisankar
January-March 2017, 40(1):9-12
DOI:10.4103/rpe.RPE_65_16  
The activity concentrations of natural radionuclides in the sediments from Pulicat Lake to Vada Nemmeli of Chennai Coast, Tamil Nadu, have been measured using gamma-ray spectrometry. The average concentration of 238U, 232Th, and 40K are 10.14, 35.02, and 425.82 Bq/kg, respectively, in sediments. Using measured activity concentrations of natural radionuclides, the radium equivalent activity (Raeq) was calculated to assess radiation hazard associated with the sediments. The calculated Raeqvalue of all the locations showed less than the recommended safe limit. The obtained results of the study could serve as an important baseline for radiometric data for future monitoring initiatives in the study area.
  457 109 1
Study of equilibrium status among uranium and thorium series radionuclides in soil samples from Visakhapatnam, India
Pradyumna Lenka, Anil Gupta, SK Sahoo, Aditi C Patra, A Vinod Kumar, PM Ravi, Raj Mangal Tripathi
January-March 2017, 40(1):18-20
DOI:10.4103/rpe.RPE_13_17  
Surface soil samples from coastal region of Visakhapatnam were analyzed for uranium series and thorium series radionuclides by high-resolution gamma-ray spectrometry. Isotopic ratios of 226Ra/238U and 224Ra/232Th were calculated to investigate the radioactive equilibrium status in the samples. 226Ra/238U and 224Ra/232Th ratios were found to vary from 0.80–1.40 to 0.94–1.40 with mean values of 1.05 and 0.99, respectively. Results showed a prevalent radioactive equilibrium for both uranium and thorium series radionuclides in the surface soil of the study area.
  420 64 -
Naturally occurring radionuclide transfer from soil to vegetables in some farmlands in Ghana and statistical analysis
Theophilus Adjirackor, Emmanuel Ofori Darko, Frederic Sam
January-March 2017, 40(1):34-43
DOI:10.4103/rpe.RPE_11_17  
Distribution studies of natural radionuclides in soil, statistical analysis of activity concentrations, and transfer factors (TFs) from soil to the vegetables grown in some selected farming communities within the Greater Accra Region in Ghana were carried out. The measurements were carried out through a gamma-ray spectrometry. The mean activity concentrations of 226Ra, 228Ra, and 40K in the fertilized soils were 20.0 ± 3.9 Bq/kg, 39.0 ± 7.0 Bq/kg, and 143.6 ± 23.3 Bq/kg, respectively. For the nonfertilized soils, mean activity concentrations were found to be 12.07 ± 2.55 Bq/kg for 226Ra, 27.1 ± 6.3 Bq/kg for 228Ra, and 87.8 ± 18.5 Bq/kg for 40K. These results were compared with reported ranges in the literature from other location in the world. The TF for 226Ra, 228Ra, and 40K from fertilized soil to vegetables was evaluated. 226Ra TF values from fertilized soil to vegetables were found to be higher in lettuce in Farm 6. The highest TF for 40K and 228Ra was found in cauliflower in Farm 4. 40K TF was higher than those values reported in other studies. The activity concentration in fertilized and unfertilized soil exhibited slightly positively skewed, negatively skewed, leptokurtic, and platykurtic distribution in terms of skewness and kurtosis. The activity concentration of natural radionuclides in fertilized and unfertilized soil is statistically insignificant at 5% level of significance using independent t-test. Pearson's correlation coefficient exhibited a negative correlation between 226Ra and 228Ra in fertilized soil and 226Ra and 228Ra in vegetables but was statistically insignificant while 40K in fertilized soil exhibited a positive correlation with 40K in vegetables and was statistically significant at 5% level of significance with a coefficient of determination of 1%, 61%, and 10% for 226Ra, 40K, and 228Ra, respectively.
  311 90 -
Heavy metal assessment in sediments of east coast of Tamil Nadu using energy dispersive X-ray fluorescence spectroscopy
N Harikrishnan, R Ravisankar, M Suresh Gandhi, KV Kanagasabapathy, M. V. R. Prasad, KK Satapathy
January-March 2017, 40(1):21-26
DOI:10.4103/rpe.RPE_67_16  
Selected heavy metals (Cr, Co, Ni, Cu, Zn, As, and Pb) in sediments from Periyakalapattu to Parangipettai of east coast of Tamil Nadu were determined to assess the contamination status and potential ecological risk. The pollution indices such as enrichment factor (EF), contamination factor (CF), geoaccumulation index (Igeo), and pollution load index (PLI) were calculated to determine the contamination level and enrichment of metals in sediments. EF analysis suggested that anthropogenic influence on the environment has been significant in case of Cr. The values of CF indicate that the sediments are not contaminated with these heavy metals. Igeoresults reveal that the study area is not contaminated with respect to Cr, Co, Ni, Cu, Zn, As, and Pb. This results of Igeoare in good agreement with PLI. Based on the sediment quality guidelines, it is observed that Cr and Ni would be a concern for the ecotoxicological risk in study area.
  319 71 -
TECHNICAL NOTE
A simple method for the estimation of phosphorus in urine
Seema Chaudhary, Sonali Gondane, Pramilla D Sawant, DD Rao
January-March 2017, 40(1):44-47
DOI:10.4103/rpe.RPE_8_17  
32P is preferentially eliminated from the body in urine and is estimated by in situ precipitation of ammonium molybdophosphate (AMP) in the urine followed by gross beta counting. The amount of AMP formed depends on the amount of stable phosphorus (P) present in the urine. Hence, the present study was undertaken to estimate daily urinary excretion of P by the spectrophotometry method. P forms a colorless complex (phosphomolybdate) with molybdic acid, which on reduction produces deep-blue-colored complex called molybdenum blue. The intensity of this blue color is directly proportional to the amount of P present in the sample. 24 h urine samples collected from radiation workers were analyzed for stable P, and its range was observed to be between 0.4 and 1.4 g/day. This information was valuable in finalizing volume of the urine sample required for analysis of 32P in bioassay sample by gross beta counting technique.
  328 51 -
NEWS AND INFORMATION
News and information

January-March 2017, 40(1):48-50
DOI:10.4103/rpe.RPE_18_17  
  316 31 -
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