Using of a Moran’s I and Hot Spot Analysis to Identify of Thoron in Najaf City using GIS Software

Document Type : Original Research Paper

Authors

1 University of Kufa, Faculty of Dentistry, Department of Basic Science, Al-Najaf, Iraq

2 University of Kufa, Faculty of Science, Department of Physics, Al-Najaf, Iraq

Abstract

AGIS method based on spatial autocorrelation analysis used to identification and ranking of thoron (220Rn)concentration. Spatial radiation patterns are analyzed using Moran's I statistic. Getis-Ord Gi* is utilized to locate clusters of high and low measurements and create a map of thoron hot spots. One hundred schools in the center of Najaf City were examined for thoron using CR-39 detectors (produced from Track Analysis Systems Ltd., UK)  for this research. Average thoron levels were 2.99 Bq/m3, with a range of 9.00 Bq/m3 to 0.22 Bq/m3. The radiation levels found in this investigation were significantly lower than the UNSCEAR 2000 safety standards of 40 Bq/m3. Moran's, I have used it to analyze the clustering of districts across a research region and to measure the spatial distribution of data. Getis-Ord Gi* statistics were used to identify cold and hot spots within the research area. Thoron concentrations were shown to have insignificant spatially random distribution patterns, as demonstrated by Global Moran's I. (Moran’s I =0.28, p-value=0.24). 

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References

Al-Hamidawi, A. A. A. (2015). Monitoring of 220Rn concentrations in buildings of Kufa Technical Institute, Iraq. Science & Technology of Nuclear Installations, 2015.
Anselin, L. (1995). Local indicators of spatial association—LISA. Geographical analysis, 27(2), 93-115.
Bochicchio, F., Forastiere, F., Abeni, D., & Rapit, E. (1998). Epidemiologic studies on lung cancer & residential exposure to radon in Italy & other countries. Radiation Protection Dosimetry, 78(1), pp: 33-38.
Chen, J., Moir, D., Pronk, T., Goodwin, T., Janik, M., & Tokonami, S. (2011). An update on thoron exposure in Canada with simultaneous 222Rn & 220Rn measurements in Fredericton & Halifax. Radiation Protection Dosimetry, 147(4), 541-547.
Cliff, A. D., & Ord, K. (1970). Spatial autocorrelation: a review of existing & new measures with applications. Economic Geography, 46(sup1), 269-292.
Gargioni, E., Honig, A., & Röttger, A. (2003). Development of a calibration facility for measurements of the thoron activity concentration. Nuclear Instruments & Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors & Associated Equipment, 506(1-2), 166-172.
Getis, A. (1991). Spatial interaction & spatial autocorrelation: a cross- product approach. Environment & Planning A, 23(9), 1269-1277.
Gorr, W. L., Kurland, K. S., & Dodson, Z. M. (2012). GIS tutorial for crime analysis. Redlands, CA: Esri Press.
Jamir, S., Sahoo, B. K., Mishra, R., & Sinha, D. (2022). A comprehensive study on indoor radon, thoron & their progeny level in Dimapur district of Nagaland, India. Radiation Protection Dosimetry, 198(12), 853-861.
Lalmuanpuia V., (2010) “Measurement of radon, thoron & their progeny concentrations in mizoram with special   reference to aizawl, champhai & kolasib districts”, A Thesis submitted to the University of Mizoram for the Degree of Doctor of Philosophy (Physics).
Lalor, G. C., & Zhang, C. (2001). Multivariate outlier detection & remediation in geochemical databases. Science of the total environment, 281(1-3), 99-109.
Mjönes, L., Falk, R., Mellander, H., & Nyblom, L. (1992). Measurements of thoron & thoron progeny indoors in Sweden. Radiation Protection Dosimetry, 45(1-4), 349-352.
Moran, P. A. P. (1950): Notes on continuous stochastic phenomena, Biometrika, 37, 17–23.
Nazarof, W. W. & Nero, A. V. Jr. (1988). Radon & its decay products in indoor air. A Wiley- Interscience Publication.
Ord, J. K., & Getis, A. (1995). Local spatial autocorrelation statistics: distributional issues & an application. Geographical analysis, 27(4), 286-306.
Pillai, P. M. B. & Paul, A. C. (1999). Studies on the equilibrium of 220Rn (Thoron) & its daughter in the atmosphere of a monazite plant & its environs. Rad. Prot. Dosim., 82, pp: 229-232.
Saed BM (1998). Determination of radon concentration in buildings by using the nuclear track detector CR-39. College of Education. Ibn Al- Haitham, University of Baghdad.
Salim, D. A., & Ebrahiem, S. A. (2019). Measurement of Radon concentration in College of Education, Ibn Al-    Haitham buildings using Rad-7 & CR-39 detector. Energy Procedia, 157, 918-925.
Schimmelmann, A. (2022). Radioactive Thoron 220Rn Exhalation From Unfired Mud Building Material Into Room Air of Earthen Dwellings. Gas Geochemistry: New Progresses & Applications.
Tu, J., & Xia, Z. G. (2008). Examining spatially varying relationships between land use & water quality using geographically weighted regression I: Model design & evaluation. Science of the total environment, 407(1), 358-378.
Verma, D., & Khan, M. S. (2014). Assessement of indoor radon, thoron & their progeny in dwellings of bareilly city of northern india using track etch detectors. Rom. Journ. Phys, 59(1-2), 172-182.
Zhang, C., Luo, L., Xu, W., & Ledwith, V. (2008). Use of local Moran’s I & GIS to identify pollution hotspots of Pb in urban soils of Galway, Ireland. Science of the total environment, 398(1-3), 212-221.
Zhuo, W., Iida, T., & Yang, X. (2000). Environmental radon & thoron progeny concentrations in Fujan province of China. Radiation Protection Dosimetry, 87(2), 137-140.
Pollution
Volume 9, Issue 3
July 2023
Pages 1140-1149

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