Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

World University root node

Department of Physics

School of Advanced Sciences

Vellore Campus

Radiation Measurements

Study on energy dependence of PAGAT polymer gel dosimeter evaluated using X-Ray CT

Nuclear structural studies at and beyond the proton drip line is done with the help of proton radioactivity. It is found that nuclei are not necessarily always spherical. The aim of the present work is to study the role of quadrupole deformation in proton rich nuclei, particularly with respect to odd Z nuclei within the region 50 &lt; Z &lt; 80 near the proton drip line. The deformation is studied using triaxially deformed cranked Nilsson Strutinsky method with tuning. Some of the nuclei in the medium mass region are found to be proton emitters from the ground state with appreciable deformation. Nuclei with 62

Turkish Journal of Physics

Role of quadrupole deformation in proton emitting nuclei in the medium mass region

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Investigation of optimal scanning protocol for X-ray computed tomography polymer gel dosimetry

Radiation Physics and Chemistry

Water equivalence of polymer gel dosimeters

Background: New radiotherapy techniques such as stereotactic radiotherapy (SRT) stereotactic radiosurgery (SRS), three dimensional conformal radiotherapy (3DCRT) and intensity modulated radiation therapy (IMRT) aim to deliver a high dose to the tumour while sparing the surrounding normal healthy tissues. As a result of these complicated treatment techniques there is a need for a 3-dimensional (3D) dose verification system. However, currently available dosimeters such as ion chambers, diodes, thermoluminescent dosimeters and films are limited to point (or) planar measurement. Multiple measurements are required to obtain the 3-dimensional dose distribution using the above dosimeters. Hence volumetric measurements are not feasible without multiple detectors (or) multiple measurements. Gel dosimetry attempts to meet the requirements of 3D radiation dose distribution. Gel dosimetry is tissue equivalent [1] and it acts as a phantom as well as dosimeter so there is no need for dose perturbation correction. Aim: Radiation-induced polymerization in polymer gel dosimeters gives rise to a change in CT number which can be measured with X-ray computed tomography (CT). The aim of this study is to assess the feasibility of using the X-ray CT scanner for the evaluation of dose distribution in polymer gel dosimetry. Materials/Methods: Polymer gel called PAGAT (Polyacrylamide Gelatin and Tetrakis hydroxymethyl phosphonium) consisting of 3.5% (w/w) BIS, 3.5% (w/w) acrylamide, 5% (w/w) gelatin, 10mM Tetrakis hydroxymethyl phosphonium (THP) and 88% (w/w) water was manufactured in normal atmospheric conditions. The gel was irradiated using a Siemens Primus linear accelerator. The radiation-induced change in CT number was evaluated using a Siemens Somatom Emotion CT scanner. The percentage depth doses and profiles were deduced. The same study was carried out using radiation field analyzer RFA-200 with RK-ion chamber and film and compared with polymer gel measurements. Results: Polymer gel dosimetry measurement was in agreement with ion chamber and film measurements except for a slight deviation in the build-up region. Discrepancies found were due to analysis of image without image averaging and background subtraction. Conclusions: This preliminary study was conducted to evaluate the feasibility of using X-ray CT-based polymer gel dosimetry for clinical use. The results of this study encourage further use of X-ray CT in conjunction with polymer gel for 3D radiation dose measurements.

Reports of Practical Oncology & Radiotherapy

Preliminary study on CT imaging of polymer gel radiation dosimetry

Poly(4-methyl-1-pentene) is the most widely used polymer in industry and medical products. Fourier transform infrared and Raman Spectra of poly(4-methyl-1-pentene) have been recorded in the range of 4000-400 and 4000-100 cm-1, respectively. In the present investigation a detailed assignments of the observed fundamental bands of poly(4-methyl-1-pentene) has been analyzed in terms of peak positions and relative intensities. With the hope of providing more and effective information on the fundamental vibrations, a normal coordinate analysis has also been performed on poly(4-methyl-1-pentene) by assuming Cs symmetry. The simple general valence force field (SGVFF) method has been employed in normal coordinate analysis and the potential energy distribution (PED) has been calculated for each fundamental vibration. The PED contribution corresponding to each of the observed frequencies shows the reliability and accuracy of spectral analysis. The validity of the SGVFF method as a practical tool for complete analysis of vibrational spectra, for poly(4-methyl-1-pentene) is confirmed in the present work. © 2003 Elsevier B.V. All rights reserved.

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

FTIR and FT Raman spectra and analysis of poly(4-methyl-1-pentene)

Cash crops such as groundnut, cashew, cotton, sesame, sugarcane, tobacco, turmeric and banana play vital role in the growth of economic and nutritional status in India. Of these, groundnuts (Arachis hyposaea L.) is the most important majer crops, which is energy rich and micro nutrient contents are relatively high compared with other corps. Out of total production, 12% is used as seeds, 8% for edible purpose, 70% extraction of oils and 10% for export and hence it is considered to be an economically important crop. This crop is found to be attacked by number of fungal diseases. Besides these fungal diseases groundnut is found to be affected by "Aflatoxins". They are probably the most serious fungal disease of groundnut on a worldwide scale. Aflatoxins are a group of highly oxygenated heterocyclic compounds with closely related structure of B1, B2, G1 and G2. These aflatoxins are closely related group of secondary fungal metabolites which have been epidemiologically implicated carcinogens in human being. The carcinogenic properties of aflatoxin have reinforced the concept that naturally occurring mycotoxins may be involved in the etiology of human cancer on a broad basis. Aflatoxin producing fungi are widely distributed in tropical and subtropical areas. Groundnut is highly susceptible to aflatoxin contamination. An attempt has been made to determine the possible variations in the amount of aflatoxin-B, present in the groundnuts grown in two different fields treated with chemical fertilizers and organic manure alone independently.

Asian Journal of Chemistry

TLC for the detection of aflatoxin in groundnut (Arachis hyposaea L.) Kernels

The determination of major, minor and trace elements in human hair shows high promise in clinical medicine and toxicology for the easy detection of diseases. In particular, the elemental analysis of human hair is becoming popular for the identification of the major element calcium in human hair samples in connection with ischaemic heart disease. Hence, an attempt has been made in the present work to investigate calcium concentration in human hair, particularly in patients suffering from coronary heart diseases through atomic absorption spectrophotometry and X-ray studies. It is concluded from the results that the south Indian partients suffering from myocardial infarction belong to the low calcium concentration peak while in healthy population the calcium level in hair is high.