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RISS 인기검색어
- 검색키워드
- 저자 : M.R. Kaçal (검색결과 4 건)
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Evaluation of gamma-ray and neutron attenuation properties of some polymers
M.R. Kaçal,F. Akman,M.I. Sayyed,F. Akman 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
In the present work, we determined the gamma-ray attenuation characteristics of eight different polymers(Polyamide (Nylon 6) (PA-6), polyacrylonitrile (PAN), polyvinylidenechloride (PVDC), polyaniline(PANI), polyethyleneterephthalate (PET), polyphenylenesulfide (PPS), polypyrrole (PPy) and polytetrafluoroethylene(PTFE)) using transmission geometry utilizing the high resolution HPGe detector anddifferent radioactive sources in the energy range 81e1333 keV. The experimental linear attenuationcoefficient values are compared with theoretical data (WinXCOM data). The linear attenuation coefficientof all polymers reduced quickly with the increase in energy, at the beginning, while decrease more slowlyin the region from 267 keV to 835 keV. The effective atomic number of PVDC and PTFE are comparativelyhigher than the Zeff of the remaining polymers, while PA-6 possesses the lowest effective atomic number. The half value layer results showed that PTFE (C2F4, highest density) is more effective to attenuate thegamma photons. Also, the theoretical results of macroscopic effective removal cross section for fastneutrons (PR) P were computed to investigate the neutron attenuation characteristics. It is found that theR values of the eight investigated polymers are close and ranged from 0.07058 cm 1 for PVDC to0.11510 cm 1 for PA-6.
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M.I. Sayyed,F. Akman,M.R. Kaçal,A. Kumar 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
The lead element or its salts are good radiation shielding materials. However, their toxic effects are high. Due to less toxicity of bismuth salts, the radiation shielding properties of the bismuth salts have beeninvestigated and compared to that of lead salts to establish them as a better alternative to radiationshielding material to the lead element or its salts. The transmission geometry was utilized to measure themass attenuation coefficient (m/r) of different salts containing lead and bismuth using a high-resolutionHPGe detector and different energies (between 81 and 1333 keV) emitted from point sources of 133Ba,57Co, 22Na, 54Mn, 137Cs, and 60Co. The experimental m/r results are compared with the theoretical valuesobtained through WinXCOM program. The theoretical calculations are in good agreement with theirexperimental ones. The radiation protection efficiencies, mean free paths, effective atomic numbers andelectron densities for the present compounds were determined. The bismuth fluoride (BiF3) is found tohave maximum radiation protection efficiency among the selected salts. The results showed that presentsalts are more effective for reducing the intensity of gamma photons at low energy region.
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An extensive investigation on gamma ray shielding features of Pd/Ag-based alloys
O. Agar,M.I. Sayyed,F. Akman,H.O. Tekin,M.R. Kaçal 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
A comprehensive study of photon interaction features has been made for some alloys containing Pd andAg content to evaluate its possible use as alternative gamma radiations shielding material. The massattenuation coefficient (m/r) of the present alloys was measured at various photon energies between81 keVe1333 keV utilizing HPGe detector. The measured m/r values were compared to those of theoreticaland computational (MCNPX code) results. The results exhibited that the m/r values of the studiedalloys are in the same line with results of WinXCOM software and MCNPX code results at all energies. Moreover, Pd75/Ag25 alloy sample has the maximum radiation protection efficiency (about 53% at81 keV) and lowest half value layer, which shows that Pd75/Ag25 has superior gamma radiationshielding performance among the other compared alloys.
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Ferdi. Akman,H. Ogul,I. Ozkan,M.R. Kaçal,O. Agar,H. Polat,K. Dilsiz 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1
Advanced radiation applications have been widely used and extended to many fields. As a result of thisfact, choosing an appropriate shielding material based on the radiation application has become vital. Inthis regard, the integration of elements into polymer composites has been investigated and contributedto the quantity and quality of radiation shielding materials. This study reports photon attenuation parametersand electromagnetic shielding effectiveness of a novel polymer composite prepared with amatrix reinforced with three different proportions (5, 10, and 15 wt%) of niobium content. Addition of Nbdopant improves both photon attenuation and electromagnetic shielding effectiveness for the investigatedcomposites. Therefore, Nb(15%) polymer composite with highest concentration has been found tobe the best absorber for ionizing and non-ionizing radiations. Consequently, the performed analyzesprovide evidences that the prepared Nb-reinforced polymer composite could be effectively used asphoton radiation attenuator and electromagnetic shielding material
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