Publish in OALib Journal
APC: Only $99
Ferrotitanium alloy polymer films, prepared by a simple technique of
casting aqueous solutions of poly(vinyl alcohol) PVA containing ferrotitanium
alloy on a horizontal glass plate, are useful as routine high-dose dosimeters.
These flexible plastic film dosimeters have pale yellow color, are bleached
when exposed to gamma rays. The chemical composition of alloy was determined by
EDX, and structure of alloy was determined by XRD. The response of these
dosimeters depends on the concentration of alloy. The energy band gap Eg was calculated and the effect of gamma radiation on its value was determined.
The optical absorption spectra showed that the absorption mechanism is an
indirect allowed transition which found that energy band gap Eg decreases after irradiation. The response of these films has negligible
humidity effects on the range of relative humidity from 0 to 100%. And also, it
exhibits good preand post-irradiation stability in dark and light.
DL-ornithine hydrochloride rods (3 ×10 mm) were studied to be a radiation sensitive material for EPR dosimetry. The rods have specified EPR signal developed under irradiation and its intensity increases with the increase in absorbed dose. The intensity also affected by the concentration of DL-ornithine in the rods. The prepared rods can be used in the dose range from 0.5 - 50 kGy. The obtained number of free radicals per 100 eV (G value) was found to be 0.3551 ± 0.0333. The hyperfine (hf) coupling constant is 2.325 mT at g-factor 2.033. The rods have the advantage of negligible humidity effects during irradiation. The pre and post- irradiation stability was found to be satisfactory.
Analysis of the elastic scattering of protons from 12C nuclei had been performed within the framework of both the optical model and single folding model at different proton energies; 17, 30.3, 40, 49.48 and 61.4 MeV. We have obtained the global potential parameters which could fairly reproduce the experimental data for p+12C elastic scattering at the aforementioned energies. The radial and energy dependence of the real and imaginary parts of the potential were calculated. Good agreement between experimental data and theoretical predictions in the whole angular range was obtained using both phenomenological approach (Optical Model), and semi-microscopic approach (Single Folding). In single folding calculations, the real part of the potential was calculated from a more fundamental basis by the folding method in which the NN interaction VNN(r), is folded into the density of the target nuclei and supplemented with a phenomenological imaginary potential. The obtained normalization factor Nr is in the range of 0.75 - 0.9.
In past decades, there has been a
growing interest in the discussion and study of using underwater acoustic
channel as the physical layer for communication systems, ranging from
point-to-point communications to underwater multicarrier modulation networks. A
series of review papers were already available to provide a history of the development of the field until the end of the last decade. In
this paper, we attempt to provide an overview of the key developments, both
theoretical and applied, in the particular topics regarding multicarrier
communication for underwater acoustic communication such as the channel and Doppler
shift estimation, video and image transmission throw multicarrier techniques,
etc. This paper also includes acoustic
propagation properties in seawater and underwater acoustic channel
We have measured the angular distributions for 12C ion beam elastically scattered from 12C target of thickness 17.4 μg/cm2 at energies 15, 18 and 21 MeV which is close to the Coulomb barrier energy for 12C + 12C nuclear system. The elastic scattering of 12C beam on 12C was analysed also at different energies (139.5, 158.8, 180, 240, 288.6, 300, 360 and 420 MeV) from literature in order to obtain the global optical potential parameters, which could fairly reproduce the experimental data. The experimental results were analysed within the framework of both the optical model and the double folding potential obtained with different density-dependent NN interactions which give the corresponding values of the nuclear incompressibility K in the Hartree-Fock calculation of nuclear matter. The agreement between the experimental results and the theoretical predictions in the whole angular range is fairly good.