Papers by Debajyoti Barooah
Radiation Measurements, Jun 1, 2003
The seasonal variations of indoor radon, thoron and their progeny levels were studied in 20 house... more The seasonal variations of indoor radon, thoron and their progeny levels were studied in 20 houses situated in the oil-rich areas of Digboi of Upper Assam. Solid-state nuclear track detectors LR-115 type II were exposed using plastic twin chamber dosemeters to record tracks formed by the two gases and their progeny. Inhalation doses were found out using extracted equilibrium factors and ventilation rates. The random (counting) errors in track densities were determined.
The coal-mining area of the foothills of Mokokchung District, Nagaland bears significant geologic... more The coal-mining area of the foothills of Mokokchung District, Nagaland bears significant geological features. Radon exhalation from ground plays an important role in enhanced indoor radon levels. Exhalation rates (mass and surface) from coal and soil samples of the area have been studied using LR-115 (II) nuclear track detectors. The mass and surface exhalation rates from coal samples varied in the range 9.7-16.2 mBq/kg/h and 323.5-538.6 mBq/m 2 /h, respectively. The mass and surface exhalation rates from soil samples varied in the range 11.1-15.2 mBq/kg/h and 368.3-507.6 mBq/m 2 /h, respectively. The study has revealed substantial presence of radionuclides in the coal and soil of the area.
ABSTRACT: Texture is literally defined as consistency of a substance or a surface. Technically, i... more ABSTRACT: Texture is literally defined as consistency of a substance or a surface. Technically, it is the pattern of information or arrangement of structure found in an image. Texture is a crucial characteristic of many image type and textural features have a plethora of application viz., image processing, remote sensing, content-based imaged retrieval and so on. There are various ways of extracting these features and the most common way is by using a gray-level cooccurrence matrix (GLCM). GLCM contains second order statistical information of neighbouring pixels of an image. In the present work, a detailed study on a sample image (8 bit gray scale image) pattern is carried out with an aim to develop a methodology that acts as a non destructive and contactless way of describing the surface texture. The study involves the use of a contemporary method, known as absolute value of differences (AVD) when the information of the image is not present in higher frequency domain. The simulated...
Gray-Level Co-occurrence Matrix Implementation based on Edge Detection Information for Surface Texture Analysis
Texture is an important property used in classifying the regions of interests in an image. Litera... more Texture is an important property used in classifying the regions of interests in an image. Literally, it is defined as the uniformity of a substance or a surface. Technically, it gives us the information about the spatial arrangement of structures in an image. One of the earliest methods used for texture feature extraction is the Gray-Level Co-occurrence Matrix (GLCM) which contains second order statistical information of neighboring pixels of an image. In this paper, we aim to produce a texture descriptor using GLCM matrix together with an edge detector operator, namely, Sobel operator in a non-destructive and contactless way. Such a descriptor is implemented to quantify the surface structure of a comparatively rough and smooth surface. Also, we have discussed about the importance of direction and distance parameters while GLCM processing.
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy, 2013
Texture is literally defined as consistency of a substance or a surface. Technically, it is the p... more Texture is literally defined as consistency of a substance or a surface. Technically, it is the pattern of information or arrangement of structure found in an image. Texture is a crucial characteristic of many image type and textural features have a plethora of application viz., image processing, remote sensing, content-based imaged retrieval and so on. There are various ways of extracting these features and the most common way is by using a gray-level cooccurrence matrix (GLCM). GLCM contains second order statistical information of neighbouring pixels of an image. In the present work, a detailed study on a sample image (8 bit gray scale image) pattern is carried out with an aim to develop a methodology that acts as a non destructive and contactless way of describing the surface texture. The study involves the use of a contemporary method, known as absolute value of differences (AVD) when the information of the image is not present in higher frequency domain. The simulated results s...
Radon exhalation rate studies in Makum coalfield area using track-etched detectors
Indian Journal of Physics, 2009
... Tracks Radiat. Meas. 19 427 (1991) [4] J Sannappa, L Paramesh and P Venkataramiah Indian J. P... more ... Tracks Radiat. Meas. 19 427 (1991) [4] J Sannappa, L Paramesh and P Venkataramiah Indian J. Phys. 71B 613 (1997) [5] AA Qureshi, HA Khan, EH Jafri, M Tufail and Mutiullah Nucl. Tracks Radiat. Meas. 8 383 (1991) [6] Y Yurong and Z Ziqiang Nucl. Tracks Radiat. Meas. ...
Radiological risk estimation from indoor radon, thoron, and their progeny concentrations using nuclear track detectors
Environmental Monitoring and Assessment
Assessment of radon exhalation rates, effective radium content and radiological exposure dose, of coal and rocks in Tiru Valley Coal Field, India using track etched technique
Physica Scripta
In this study, the outcomes of assessments of radon exhalation rates for both mass and surface, r... more In this study, the outcomes of assessments of radon exhalation rates for both mass and surface, radium content and annual effective dose from 45 numbers of geological samples in Tiru Valley Coal Field area are presented. The nuclear track detector LR-115 (II) of bulk etch rate, VB = 4 μm h−1 with a spark counter to archive alpha track density of radon was used to measure radon exhalation rate from the samples and to assess radiological exposure in the coalfield area, which has significant geological characteristics. In this work, the surface exhalation rates for coal, carbonaceous shale and sandstone samples have been estimated to be in the range of 217.4–659.9 mBq m−2 h−1, 234.0–381.1 mBq m−2 h−1 and 337.1–741.4 mBq m−2 h−1, respectively. The mass exhalation rates for coal, carbonaceous shale and sandstone samples varied in the range of 6.5–19.8 mBq kg–1 h−1, 7.0–11.4 mBq kg–1 h−1, and 10.1–22.2 mBq kg–1 h−1, respectively. The radium contents have been found to vary in the range of...
Study of radon exhalation rates from coal using solid state nuclear track detectors
Journal of Radioanalytical and Nuclear Chemistry, 2021
In this paper, we present the results of radon (222Rn) exhalations rates along with radium conten... more In this paper, we present the results of radon (222Rn) exhalations rates along with radium contents and annual effective dose in the coal-mining areas of Assam, India using LR-115 (II) nuclear track detectors. The mass exhalation rates for coal in Makum coalfield and Dilli-Jeypore coalfield have ranged 5.8 ± 1.15–19.7 ± 2.98 mBq kg−1 h−1 and 17.1 ± 2.60–28.7 ± 3.65 mBq kg−1 h−1 respectively. The surface exhalation rates for coal ranged 2.15 ± 0.42–7.27 ± 1.10 mBq m−2 h−1 and 6.32 ± 0.96–10.57 ± 1.34 mBq m−2 h−1 in Makum coalfield and Dilli-Jeypore coalfield respectively. The radium contents in the coal have been found to be in the range 0.8 ± 0.15–2.6 ± 0.40 Bq kg−1 and 2.3 ± 0.35–3.8 ± 0.49 Bq kg−1 in Makum coalfield and Dilli-Jeypore coalfield respectively. The annual effective doses due to radon have been estimated to be in the range 0.16 ± 0.03–0.53 ± 0.08 μSv y-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\upmu {\text{Sv y}}^{ - 1}$$\end{document} and 0.46 ± 0.07–0.77 ± 0.10 μSv y-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\upmu {\text{Sv y}}^{ - 1}$$\end{document} respectively.
Study of subsoil radon anomaly using LR-115 (II) nuclear track detectors in and around the Geleki oilfield, Assam Shelf
Indian Journal of Physics, 2012
The subsoil radon gas anomaly in and around the anticlinal structure of the Geleki oilfield, Assa... more The subsoil radon gas anomaly in and around the anticlinal structure of the Geleki oilfield, Assam Shelf was studied using LR-115 (II) nuclear track detectors following a grid-sampling pattern. The present study was undertaken to understand the variability of the soil-gas radon concentrations with reference to the oil-wells, drilling activities and local geology. From the alpha-tracks formed on the detectors, the soil-gas radon concentrations were determined using a Spark Counter. The results showed that the natural background soil-gas radon radiation levels in the Geleki oilfield ranged from 1 to 5 kBq/m3 over the subsurface reservoir with anomaly of enhanced values of 12–13 kBq/m3 around the periphery of the oilfield. It has been concluded from the observed soil-gas radon distribution patterns that drilling beyond the extent of the northwestern and eastern corners of the oilfield may yield potential subsurface oil accumulations.
Environmental Monitoring and Assessment, 2014
Radon/Thoron/Exhalation rate/Simultaneous measurements/UNSCEAR equation. We simultaneously measur... more Radon/Thoron/Exhalation rate/Simultaneous measurements/UNSCEAR equation. We simultaneously measured radon and thoron exhalation rates in areas of weathered acid rocks in Japan to investigate the relationship between them and between measured and calculated radon exhalation rates. To calculate the radon exhalation rate, we used an equation proposed by UNSCEAR. Our analysis showed that both the radon and thoron exhalation rates measured at one location in a natural environment fluctuated widely, even within one day. We found a strong correlation between the radon and thoron exhalation rates. The measured radon exhalation rates tended to be lower than the calculated values: the mean ratio of the measured exhalation rate to the calculated rate was 0.65. We concluded that the UNSCEAR equation is applicable under a controlled environment (temperature, humidity, etc.), but not where there are artificial underground structures that may influence the transportation of radon in soil.
The radium contents, radon exhalation rates and corresponding annual effective doses due to inhal... more The radium contents, radon exhalation rates and corresponding annual effective doses due to inhalation of radon from coal and soil of Dilli-Jeypore coalfield of Assam, India have been measured using LR-115 (II) nuclear track detectors in the context of health risks. In the present paper, the results of the study with their corresponding geometric means (GM), geometric standard deviations (GSD) and error estimates for both coal and soil samples are presented. The estimated values for coal samples are in the range 1274.2-1658.8 Bq/m, 16.0-20.8 mBq/kg/h, 532.5-693.2 mBq/m/h, 16.4-21.4 Bq/kg and 38.7-50.3 μSv/y for radon activity, mass exhalation rate, surface exhalation rate, radium content and annual effective dose, respectively. In the case of soil, the values for radon activity, mass exhalation rate, surface exhalation rate, radium content and annual effective dose were estimated to be in the range 1308.8-2105.6 Bq/m, 16.4-26.4 mBq/kg/h, 547.0-880.0 mBq/m/h, 16.9-27.1 Bq/kg and 39.7...
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Papers by Debajyoti Barooah