title: Assessment of natural radioactivity and function of minerals in soils of Yelagiri hills, Tamilnadu, India by Gamma Ray spectroscopic and Fourier Transform Infrared (FTIR) techniques with statistical approach.
abstract: Gamma Ray and Fourier Transform Infrared (FTIR) spectroscopic techniques were used to evaluate the natural radioactivity due to natural radionuclides and mineralogical characterization in soils of Yelagiri hills, Tamilnadu, India. Various radiological parameters were calculated to assess the radiation hazards associated with the soil. The distribution pattern of activity due to natural radionuclides is explained by Kriging method of mapping. Using FTIR spectroscopic technique the minerals such as quartz, microcline feldspar, orthoclase feldspar, kaolinite, montmorillonite, illite, and organic carbon were identified and characterized. The extinction coefficient values were calculated to know the relative distribution of major minerals such as quartz, microcline feldspar, orthoclase feldspar and kaolinite. The calculated values indicate that the amount of quartz is higher than orthoclase feldspar, microcline feldspar and much higher than kaolinite. Crystallinity index was calculated to know the crystalline nature of quartz. The result indicates that the presence of disordered crystalline quartz in soils. The relation between minerals and radioactivity was assessed by multivariate statistical analysis (Pearson's correlation and cluster analysis). The statistical analysis confirms that the clay mineral kaolinite and non-clay mineral quartz is the major factor than other major minerals to induce the important radioactivity variables and concentrations of uranium and thorium.
authors.affiliation: Department of Physics, Vel Tech (Owned By RS Trust), Chennai 600062, Tamil Nadu, India.
authors.forename: A
authors.initials: A
authors.lastname: Chandrasekaran
authors.affiliation: Post Graduate and Research Department of Physics, Government Arts College, Thiruvanamalai 606603, Tamil Nadu, India. Electronic address: ravisankarphysics@gmail.com.
authors.forename: R
authors.initials: R
authors.lastname: Ravisankar
authors.affiliation: Department of Physics, SSN College of Engineering, Kalvakkam, Chennai 603110, Tamil Nadu, India.
authors.forename: A
authors.initials: A
authors.lastname: Rajalakshmi
authors.affiliation: Department of Physics, Dhaanish Ahmed College of Engineering, Vanchuvancherry, Padappai, Chennai 601301, Tamil Nadu, India.
authors.forename: P
authors.initials: P
authors.lastname: Eswaran
authors.affiliation: Radiation Safety Section, Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India.
authors.forename: P
authors.initials: P
authors.lastname: Vijayagopal
authors.affiliation: Radiation Safety Section, Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India.
authors.forename: B
authors.initials: B
authors.lastname: Venkatraman
keywords: FT-IR; Gamma Ray spectrometer; Mineral analysis; Multivariate statistical analysis; Natural radioactivity; Soil