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Interaction of oxygen (O+7) ion beam on polyaniline thin films
No full textHigh-energy ion beam irradiation of the polymers is a good technique to modify the properties
such as electrical conductivity, structural behaviour and mechanial properties. Polyaniline thin films doped with
hydrochloric acid (HCl) were prepared by oxidation of ammonium persulphate. The effect of Swift Heavy Ions
irradiation on the electrical and structural properties of polyaniline has been measured in this study. Polyaniline
films were irradiated by oxygen ions (energy 80 MeV, charge state O+7) with fluence varying from 1 × 1010 to 3
× 1012 ions/cm2. The studies on electrical and structural properties of the irradiated polymers were investigated
by measuring V-I using four probe set-up and X-ray diffraction (XRD) using Bruker AXS, X-ray powder
diffractometer. V-I measurements shows an increase in the conductivity of the film, XRD pattern of the polymer
shows that the crystallinity improved after the irradiation with Swift Heavy Ions (SHI), which could be attributed
to cross linking mechanism.Subhash Chandra1*, S Annapoorni2, R G Sonkawade3, P K Kulriya3 Fouran Singh3,
D K Avasthi3, J M S Rana1 and R C Ramola1
1Department of Physics, H N B Garhwal University, Badshahi Thaul Campus,
Tehri Garhwal-249 199, Uttarakhand, India
2Department of Physics and Astrophysics, University of Delhi, Delhi-110 007, India
3Inter University Accelerator Center, Aruna Asaf Ali Marg, New Delhi-110 067, India
E-mail : [email protected] of Physics, H N B Garhwal University, Badshahi Thaul Campus,
Tehri Garhwal-249 199, Uttarakhand, India
Department of Physics and Astrophysics, University of Delhi, Delhi-110 007, India
Inter University Accelerator Center, Aruna Asaf Ali Marg, New Delhi-110 067, Indi
Fabrication of ZnO nanorods for optoelectronic device applications
No full textHydroxyl free zinc oxide nanorods have been synthesized by a catalyst
free surfactant based one-step solid state reaction process. The powder X-ray
diffraction studies reveal well defined wurtzite peaks due to crystalline ZnO, while
optical absorption spectra represent prominent exciton absorption and remarkable
blueshift in the onset of absorption. As predicted by transmission electron
microscopy, the ZnO nanorods are ~100 nm long and of ~20 nm dia. Further,
luminescence aspects of such nanorods are studied for possible deployment in
optoelectronics devices.Fabrication of ZnO nanorods for optoelectronic device applications
R Chakraborty1, U Das1*, D Mohanta1,2 and A Choudhury1,3
1Nanoscience Laboratory, Department of Physics, Tezpur University, P.O. Napaam,
Tezpur-784 028, Assam, India
2Laboratory for Molecular Scale Engineering, Electrical and Computer Engineering,
University of Wisconsin-Madison, WI-53706, USA
3Gauhati University, Gopinath Bordoloi Nagar, Guwahati-781 014, Assam, India
E-mail : [email protected] Laboratory, Department of Physics, Tezpur University, P.O. Napaam,
Tezpur-784 028, Assam, India
2Laboratory for Molecular Scale Engineering, Electrical and Computer Engineering,
University of Wisconsin-Madison, WI-53706, USA
3Gauhati University, Gopinath Bordoloi Nagar, Guwahati-781 014, Assam, Indi
Dosimetric model of human lung and associated computer program
No full textThe dosimetric human respiratory tract model given in ICRP Publication 66
and ICRPVol. 32 is briefly described in this paper. The associated home-written
computer programs for calculations of radiation dose from radon and its short-lived
progeny are presented, together with some representative results.Author Affiliation: D Nikezic and K N Yu
1.University of Kragujevac, Faculty of Science, R. Domanovic 12, Kragujevac, Serbia
2.City University of Hong Kong, Department of Physics and Materials Science, Hong
Kong, P. R. China
E-mail : [email protected] of Kragujevac, Faculty of Science, R. Domanovic 12, Kragujevac, Serbia
2City University of Hong Kong, Department of Physics and Materials Science, Hong
Kong, P. R. Chin
The influence of solar radiations to the physical and structuralproperties of CR-39
No full textLong chain polymers owe many of their properties to the structural
arrangements of their molecules and are extensively used for many industrial and
applied sciences. One of such application is their perspective use in the field of
solid-state nuclear track detectors. However they are profoundly influenced by low
LET radiations exposure and new structural arrangements may emerge. CR-39 is one of
the most popular polymeric track detectors, however its aliphatic nature restricts
its applications. Thus in the present investigations the damage densities produced
by solar radiations to the polymer have been estimated by analyzing the structural,
physical and etching properties of the polymer. The polymer is found to be highly
sensitive towards solar radiations and great changes in physical and structural
properties of polymer have been observed. The sensitivity of the polymer has been
found to decrease by 83.40% during eight months.The influence of solar radiations to the physical and structuralproperties of CR-39
Sangeeta Prasher1*, Mukesh Kumar2 and Surinder Singh3
1Department of Physics, Kanya Maha Vidyalaya, Vidyalaya Marg, Jallandhar-144 004,
Punjab, India
2Department of Physics, Lovely Proffessional University, Phagwara-144 402, Punjab,
India
3Department of Physics, Guru Nanak Dev University, Amritsar-143 005, Punjab, India
E-mail : [email protected] of Physics, Kanya Maha Vidyalaya, Vidyalaya Marg, Jallandhar-144 004,
Punjab, India
2Department of Physics, Lovely Proffessional University, Phagwara-144 402, Punjab,
India
3Department of Physics, Guru Nanak Dev University, Amritsar-143 005, Punjab, Indi
2p3/2 –13x–1–3x–13d–1 X-ray satellites spectra in the Lα1 region of 4d transition elements
No full textThe X-ray satellite spectra arising due to 2p3/2–13x–1–3x–13d–1 (x = s,
p, d) transition array, in elements with Z = 40 to 48, have been calculated, using
available Hartree-Fock-Slater (HFS) data on 1s–1–2p–1 3x – and 2p3/2–1–3x–1,3x–1
Auger transition energies. The relative intensities of all the possible transitions
have been estimated by considering cross – sections for the Auger transitions
simultaneous to a hole creation and then distributing statistically the total cross
sections for initial two hole states 2p3/2–1–3x–1 amongst various allowed
transitions from these initial states to 3x–1 3d–1 final states by Coster-Kronig
(CK) and shake off processes. In both these processes initial single hole creation
is the prime phenomenon. Each transition has been assumed to give rise to a Gaussian
line and the overall spectrum has been computed as the sum of these Gaussian curves.
The calculated spectra have been compared with the measured satellite energies in
La1 spectra. Their intense peaks have been identified as the observed satellite
lines. The peaks in the theoretical satellite spectra were identified as the
experimentally reported satellites a3, a4 and a5, which lie on the high-energy side
of the La1 dipole line.Author Affiliation: Surendra Poonia and S N Sonib
1.Division of Natural Resources and Environment, Central Arid Zone Research Institute,
Jodhpur-342 003, Rajasthan, India
bX-ray Laboratory, Physics Department, Jai Narain Vyas University, Jodhpur-342 005,
Rajasthan, India
E-mail : [email protected] of Natural Resources and Environment, Central Arid Zone Research Institute,
Jodhpur-342 003, Rajasthan, India
bX-ray Laboratory, Physics Department, Jai Narain Vyas University, Jodhpur-342 005,
Rajasthan, Indi
Energy loss of light ions in polypropylene absorber foils
No full textThe energy loss of Li, C and O ions in polypropylene absorber foils has been measured using 15
UD Pelletron Accelerator facility at Inter University Accelerator Centre (IUAC), New Delhi, India. The actual
experiment has been performed in low flux chamber attached to the General Purpose Scattering Chamber
(GPSC). These experimental energy loss values have been compared with the computed values based on
various empirical/semi-empirical formulations. Some interesting trends have been observed.Vishal Sharma1, P K Diwan2*, Pratibha3, Tanu Sharma3, Shyam Kumar3 and D K Avasthi4
1Department of Physics, Chandigarh Engineering College, Landran, Mohali-140 307, India
2Department of Physics, U.I.E.T., Kurukshetra University, Kurukshetra-136 119, India
3Department of Physics, Kurukshetra University, Kurukshetra-136 119, India
4 Inter University Accelerator Centre, Aruna Aasf Ali Marg,
New Delhi-110 067, India
E-mail : [email protected] of Physics, Chandigarh Engineering College, Landran, Mohali-140 307, India
Department of Physics, U.I.E.T., Kurukshetra University, Kurukshetra-136 119, India
3Department of Physics, Kurukshetra University, Kurukshetra-136 119, India
Inter University Accelerator Centre, Aruna Aasf Ali Marg,
New Delhi-110 067, Indi
Analysis of seasonal variation of indoor radon concentration in Tehri Garhwal, Northern India
No full textThe seasonal variation analysis of indoor radon has been carried out in the hilly region of Tehri
Garhwal, Northern India by using LR-115 Type II, plastic track detector. In the analysis the winter/summer ratio
radon values were found to vary from 0.63 to 1.64 and 1.02 to 1.22 for cemented houses and mud houses,
respectively. Over all the average value of winter/summer ratio was found maximum in both cemented and mud
houses respectively.Author Affiliation: M S Kandari and R C Ramola
1.Department of Physics, Govt. P G Collage Kotdwara, Pauri Garhwal-246 149,
Uttarakhand, India
2Department of Physics, H N B Garhwal University, Badshahi Thaul Campus,
Tehri Garhwal-249 199, Uttarakhand, India
E-mail : [email protected] of Physics, Govt. P G Collage Kotdwara, Pauri Garhwal-246 149,
Uttarakhand, India
2Department of Physics, H N B Garhwal University, Badshahi Thaul Campus,
Tehri Garhwal-249 199, Uttarakhand, Indi
Dy3+ emission in M5(PO4)3F (M = Ca, Ba) phosphor
No full textUltrafine M5(PO4)3F:Dy3+ (M = Ca, Ba) phosphors were prepared via
combustion process using metal nitrates as precursors. The formation of crystalline
phosphate was confirmed by X-ray diffraction pattern. The PL excitation spectra show
the excitation peaks observed at 250 to 400 nm due to f.f transition of Dy3+ ion,
which are useful for solid-state lighting purpose (mercury free excitation). The PL
emission of Dy3+ ion by 348 nm excitation gave an emission at 489 nm (blue), 582 nm
(yellow) and 675 nm (red). All the characteristics of BYR emissions like BGR
indicate that Dy doped Ca5(PO4)3F and Ba5(PO4)3F phosphors are good candidates that
can be applied in solid-state lighting phosphor (mercury free excited lamp phosphor)
and white light LED.Author Affiliation: K N Shinde1, I M Nagpure1, S J Dhoble, S V Godbole and M K Bhide
1.Kamla Nehru Mahavidyalaya, Sakkardara Square, Nagpur-440 009, Maharashtra, India
2.Spectroscopy Section, Radio Chemistry Division, Bhabha Atomic Research Centre,
Mumbai-400 085, India
E-mail : [email protected] Nehru Mahavidyalaya, Sakkardara Square, Nagpur-440 009, Maharashtra, India
2Spectroscopy Section, Radio Chemistry Division, Bhabha Atomic Research Centre,
Mumbai-400 085, Indi
Designing polymers for nuclear track detection
No full textThis article describes our attempts since 1996 to systematically design
andsynthesize monomers and corresponding polymers for nuclear track detection. So
far more than 15 homopolymers.copolymers have been prepared and tested by us for
this purpose. Some of these polymers show better track detection characteristics
vis-á-vis commercially available poly allyl diglycol carbonate (PADC) track
detectors.Author Affiliation: V S Nadkarni
1.Department of Chemistry, Goa University, Goa-403 206, India
E-mail : [email protected] of Chemistry, Goa University, Goa-403 206, Indi
Calibration of CR-39 solid state nuclear track detector
No full textNowadays there are increasing uses of SSNTD on scientific works in
Thailand. Currently we are using SSNTD as an important tool for confirming active
fault zones in a province in which a new nuclear research reactor has been proposed
to come up. Soil gas radon was measured by both active and passive methods. In the
latter case CR-39 SSNTD was installed in a PVC tube of 50 cm long by 5 cm in
diameter. The tubes were placed in 50-cm deep holes lining perpendicular to the
faults’ trace for one week. In this paper we describe the method and the results on
calibrating these detectors using a radon chamber and a NIST-traceable radium-226
standard source.Author Affiliation: P Wanabongse, B Sola, J Jamsangtong and S Rattanabussayaporn
1. Thailand Institute of Nuclear Technology, 16 Vibhavadi Rangsit Road, Chatuchak,
Bangkok 10900, Thailand
2Department of Nuclear Technology, Chulalongkorn University, Payathai Road,
Patoomwon Bangkok 10330, Thailand
3Office of Atoms for Peace, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900,
Thailand
E-mail : [email protected] Institute of Nuclear Technology, 16 Vibhavadi Rangsit Road, Chatuchak,
Bangkok 10900, Thailand
2Department of Nuclear Technology, Chulalongkorn University, Payathai Road,
Patoomwon Bangkok 10330, Thailand
3Office of Atoms for Peace, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900,
Thailan