Samir Ushaa El-Kameesy

Ain Shams University · Department of Physics

In the present work, polyvinylchloride/acrylonitrile butadiene rubber PVC/NBR was blended on a Brabender mixer. The blends obtained were cured with peroxide curing systems and loaded with different concentrations of lead monoxide (PbO) for increasing shielding properties of the investigated blends. The physicomechanical and the shielding properties...

Boron, Titanium and boron – titaniumaustenitic stainless steel alloys were developed to be used as a nuclear reactor shielding material. Three grades of steel alloys with base composition of AISI316 but having either Ti or B or Ti and B (SS316Ti, SS316B and SS316TiB) were designed and produced using 30 kg pilot plant medium frequency induction furn...

Abstract In this article, the influence of radio frequency plasma nitriding three differnt grades of austenite stainless steels as nuclear materials for thermal Reactors has been studied. The plasma nitriding process was prformed for all samples at the same plasma nitriding environmental conditions, using (1:1) hydrogen and nitogen gases at 500 W p...

In this paper thorium fuel feasibility in large scale Gas Cooled Fast Reactor (GCFR) is investigated. The neutronics benchmark used in this study, GFR2400, corresponds to a 2400 MWth GFR concept proposed by the French CEA. MCNPX computational code is used to design a 3D heterogeneous model of the GFR2400 core. A detailed feasibility analysis of the...

The present study aims to examine the effect of rf plasma surface carbonitriding on austenite stainless steel AISI304L, SSMn6Ni and SSMn10Ni for pressurized water reactors application. All samples were fabricated at Central Metallurgical Research & Devolopment Institute (CMRDI), Egypt. They were also carbonitrided by rf plasma in a mixture of nitro...

Optical spectral analysis of a glass system with composition xPbO – 20 SiO2–10 Na2O – (70 - x) B2O3, where x = 20, 30, 40, 50 and 60 mol %, was studied. The investigated samples were prepared using the normal melt quench technique. The structural properties of the prepared samples were characterized using X-ray diffraction (XRD), density, molar vol...

The fluorescence and light absorption and dielectric characteristics of wheat are studied to investigate the influence of gamma exposure on germination, morphological and physical properties of wheat plant. Wheat grains were irradiated at 0, 1.5, 2, 2.5, 3, 5, 7 and 10 krad. The obtained results indicated that, pronounced increase in germination ra...

For the sake of completeness of the surveillance process concerning the spread of depleted uranium (DU) in the Arabian Gulf region, we have applied a simple gamma spectroscopy technique to evaluate its content in Al Jolan, Nazzal and Askari districts in Al Fallujah area, Iraq for the first time and after more than one decade. The measurements were...

The effects of plasma surface engineering on average surface roughness, wettability and gamma ray attenuation properties of AISI316L standard steel sample were investigated. The results showed an increase in surface roughness accompanied with an increase in the surface energy and a decrease in the contact angle of the N316L sample treated by plasma...

1. The electro-slag re-melting technique was used to produce locally two standard stainless steel samples, AISI304L and AISI316L. The shielding properties of both neutrons and gamma radiation were determined using BF3 and NaI(Tl) detectors [1,2]. 2. A mixture of hydrogen and nitrogen gases (1:1) was used to investigate the effect of rf plasma surfa...

The electro-slag re-melting technique was used to produce locally two standard stainless steel samples, AISI304L and AISI316L. The shielding properties of both neutrons and gamma radiations were determined using He-3 and NaI(Tl) detectors. A mixture of hydrogen and nitrogen gases (1:1) was used to investigate the effect of rf plasma surface enginee...

Abstract. The electro-slag re-melting technique was used to produce locally two standard stainless steel samples, AISI304L and AISI316L. The shielding properties of both neutrons and gamma radiations were determined using He-3 and NaI(Tl) detectors. A mixture of hydrogen and nitrogen gases (1:1) was used to investigate the effect of rf plasma surfa...

Background Radiation protection and detection have been a main interest for researchers. The prepared glass samples were subjected to experimental investigations to evaluate their mechanical and attenuation properties. As a consequence, the values of the mass attenuation coefficient, total electronic cross section, the effective atomic number and a...

Modified glassy barriers of the composition (70-x) B2O3-10Al2O3-10Na2O-10ZnO-xPbO have been studied to be used as gamma rays shielding materials. The studied samples were prepared using the melt-quenching technique. The amorphous phase of the prepared samples has been checked. The structural properties of the present glasses were investigated using...

For long times there has been a sustained international interest in partitioning and transmutation of spent fuel produced by fission reactors, in particular both plutonium (Pu) and minor actinides (MA), which are associated with nuclear proliferation risks and radioactivity hazards. Transmutation requires the Pu and MA to be irradiated in a very in...

Lead borosilicate glasses, of chemical composition 20SiO2-xPbO-(15 + x)B2O3-5WO2-10ZnO-(50-2x) Na2O (where x = 5, 10, 15, 20, 25) were prepared using the normal melt-quenching technique. The samples were examined using a Philips Analytical X-ray diffraction system in order to check their amorphous nature. The effect of increasing B2O3 and PbO conte...

Optical properties of xBaO–5ZnO–5MgO–14Na2O–1Li2O–(75x)B2O3 glasses (where x = 0, 10, 20, 30, 40, and 50 mol %) were performed using a UV-Visible spectrophotometer in the spectral range 190–1100 nm. Various optical parameters such as optical band gap, Urbach energy, refractive index, electronic polarizability and optical basicity were deduced. The...

Excitation functions for \(\alpha \)-induced reactions on natural vanadium were measured in the energy range up to 20 MeV. The stacked-foil activation technique was used. The experimental results were compared with the theoretical calculations using EMPIRE-3.1, EMPIRE-3.2.2 and TENDL 2015, and with earlier experimental results. Thick target yields...

In this paper thorium fuel feasibility in large scale Gas Cooled Fast Reactor (GCFR) is investigated. The neutronics benchmark used in this study, GFR2400, corresponds to a 2400 MWth GFR concept proposed by the French CEA. MCNPX computational code is used to design a 3D heterogeneous model of the GFR2400 core. A detailed feasibility analysis of the...

The 2400 MW Gas Cooled Fast Reactor (GFR2400) is a promising potential candidate for future sustainable and economic nuclear power systems. It is a highly innovative system with advanced geometrical design and fuel materials (Ceramic fuel pellets of mixed uranium-plutonium carbide within fuel pins). The active fuel region of this reactor is divided...

The effect of nitrogen plasma surface treatment on the structural, mechanical, and neutron attenuation properties of AISI316L stainless steel was carried out. The mechanical and rate of plasma treatment results show that the treated N316L stainless steel has superior wear and micro-hardness values than that of the untreated one AISI316L.The experim...

The effect of nitrogen plasma surface treatment on the structural, mechanical, and neutron attenuation properties of AISI316L stainless steel was carried out. The mechanical and rate of plasma treatment results show that the treated N316L stainless steel has superior wear and micro-hardness values than that of the untreated one AISI316L. The experi...

The effect of nitrogen plasma surface treatment on the structural, mechanical, and neutron attenuation properties of AISI316L stainless steel was carried out. The mechanical and rate of plasma treatment results show that the treated N316L stainless steel has superior wear and micro-hardness values than that of the untreated one AISI316L.The experim...

Twenty soil and 25 sediment samples were collected from the banks and bottom of the River Nile in the surroundings of biggest cities located close to it. Natural radioactivity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K have been evaluated for all samples by means of γ spectrometric analysis. The radioactivity levels of soil and sediment samples fall wi...

A new composite of silicone rubber and boric acid was developed to be used as a personal wearing for protection from nuclear radiation. The capability of this material for absorbing thermal neutrons of different intensities followed by a detonation of nuclear weapon has been investigated. This investigation was performed by using californium-252 ne...

1 The technically enhanced concentrations of Naturally Occurring Radioactive Materials (NORMs) were measured in 27 different samples from an oil refinery where crude oil from different wells are processed. The activity concentrations relevant to naturally occurring radionuclides in the samples (waste water, ash and crude oil) were determined by a g...

1 The technically enhanced concentrations of Naturally Occurring Radioactive Materials (NORMs) were measured in 27 different samples from an oil refinery where crude oil from different wells are processed. The activity concentrations relevant to naturally occurring radionuclides in the samples (waste water, ash and crude oil) were determined by a g...

1 New grades of free nickel high manganese stainless steel (SSMn4N) and free cobalt Maraging steel have been prepared using a pilot plant induction furnace. Additionally, four types of standard stainless steels (three austenitic SS304, SS304L, SS316L and one ferritic SS430) were prepared. Gamma ray mass attenuation coefficients were carried out exp...

Electro-slag remelting technique has been applied to produce steel alloys of different compositions. In these compositions chromium contents have been increased on the expense of iron. Mass attenuation coefficients and effective electron densities have been calculated in the photon energy range up to 2750 keV, and a comparison of the experimental a...

The specific activities of 226 Ra, 232 Th and 40 K in a variety of rock samples from Taiz region, Yemen were investigated using gamma ray spectroscopy technique to estimate the associated radiation hazard impacts. Furthermore, the X-ra y fluorescence technique has been applied to detect the natural elements that may have industrial import ance. The...

Many archaeological sites in Egypt are unique worldwide, such as ancient tombs and pyramids, because they document fundamental developments in human civilization that took place several thousands of years ago. For this reason, these sites are visited by numerous visitors every year. The present work is devoted to provide a pre-operational radiologi...

Forty three soil and thirty nine sediment samples were collected from the banks of different cities located in Rashid and Damietta branches of the River Nile. Natural radioactivity concentrations of 238 U, 232 Th and 40 K ha ve been evaluated for all samples by means of gamma spectrometric analysis using hyper pure Ge detector. The radioactivity le...

In the present work the nuclear structure properties and the backbending phenomena of even-even isotopes at A ≈ 70 mass region are analyzed using two simultaneous theoretical models based on a simple modified version of the collective model predictions besides an improved version of exponential model with the inclusion of pairing correlation. In ge...

The radioactivity concentrations of 226 Ra, 232 Th and 40 K in thirty samples representing the technically Naturally Occurring Radioactive Materials (NORM) in the Egyptian natural gas were investigated. The investigations were performed using a gamma ray spectroscopy technique. The obtained data were used to establish a data base for NORM concentra...

The radioactivity concentrations of 226 Ra, 232 Th and 40 K in thirty samples representing the technically Naturally Occurring Radioactive Materials (NORM) in the Egyptian natural gas were investigated. The investigations were performed using a gamma ray spectroscopy technique. The obtained data were used to establish a data base for NORM concentra...

Row data

Excitation functions of 3He induced nuclear reactions on natSn were measured up to 26 MeV using the stacked-foil technique, utilizing the MGC-20E cyclotron of ATOMKI. Using HPGe detector the following radioisotopes were identified: 116,117,118,119g,119m,121g,121m,123mTe, 115g,116m,117,118m,120m,122g,124gSb and 113g,117mSn. The experimental results...

Cobalt-free maraging steels of different compositions have been prepared by electro-slag remelt-ing technique using titanium and chromium instead of cobalt. Neutron removal cross-sections have been calculated, also mass attenuation coefficients and effective electron densities have been determined for the prepared samples in the photon energy range...

Cobalt-free alloy of constituent's " 0.045%C-12.73%Ni-6.53%Cr-3.2%Mo-0.02%Ti-0.01%V " has been prepared by electro slag remelting technique. Mass attenuation coefficient, half value layer and effective atomic number have been determined for the prepared sample at photon energies 235-2700 keV. The results are compared with the corresponding theoreti...

The study of the neutronic safety parameters in reactors is very important since it provides a guide for future study in reactor design. Also, it is considered as the basic step for reactor waste transmutation. In the present work, some of the basic neutronic parameters that characterised the MINERVE reactor in the different core configurations R1-...

Improving neutronic prediction is a very important step in designing advanced reactors and reactor fuel. There are three main critical reactor facilities of the CEA Cadarache. These reactor facilities are EOLE, MINERVE and MASURCA. The MINERVE reactor is used within the frame work of what is known as OSMOSE project. The OSMOSE program aims at impro...

Twenty-two soil samples were collected from different locations along Ismailia Canal. Natural radioactivity concentrations of 226 Ra, 232 Th and 40 K have been determined for all samples. The average activity concentration of 226 Ra, 232 Th and 40 K were 24, 21 and 323.8 Bq/Kg, respectively. The parameters which are used to assess the radiological...

Silicone rubber composite sheets filled with different concentrations (15-42wt. %) of lead oxide was fabricated inhouse to be used as γ-radiation shielding materials. The shielding properties of the composite (linear attenuation coefficient (μ) and total mass attenuation coefficient (μ/ρ)) have been evaluated using three radioactive point sources (...

Experimental studies of the optical band passes filter behavior of a new series of copper phosphate glasses have been carried out. The amorphous nature of the prepared samples was examined using XRD analysis. The effect of different contents of CuO on the thermal transition temperature (Tg) was investigated using differential thermal analysis (DTA)...

Aim: The present study is devoted to evaluate the dose at different points defined on the patient using semiconducting diodes and thermoluminescence detectors to excute verification of the dose at these relevant points calculated by means of movement couch and Beam-Zones method of the Total Body Irradiation Technique. Material and Method: In this t...

As a part of the national survey to evaluate some strategic elements such as U, Mn, Fe and Cu we have undertaken a quantitative study to fulfill this target. Twenty sediment samples were collected from Abu Rusheid Area in South Eastern desert of Egypt. The concentrations of radium-226 and thorium-232 were determined by direct counting using a hyper...

Over the past 40 years a generic class of ultra- high strength maraging steels have been developed mainly for aircraft, aerospace and tooling applications the ultra–high strength of the most expensive maraging steels is due to the precipitation of intermetallic compounds (high nickel and molybdenum) during ageing process such as Ni3Mo, FeMo and Fe7...

The Um Bogma Formation represents the main target of this study where most of uranium occurrences are incorporated in its sediments. It conformably underlies the El Hashash Formation and unconformably overlies the Adadia Formation. The Um Bogma Formation was introduced in (1969) in using the name Um Bogma Formation, for the Carboniferous carbonate...

Radioactive contamination in air dust particles of Cairo atmosphere from the Fukushima accident was detected by the gamma-ray spectroscopy technique. Analysis of the spectra obtained by using an High-Purity Germanium detector showed that there were some traces of (131)I and (134, 137)Cs. Estimate and study of concentration of those radionuclides we...

In the present work, ZnO·PbO·B2O3 glasses are prepared to be used as g-ray shielding materials. The attenuation properties of these glasses with different concentrations of PbO (20% - 70%) have been investigated at photon energies 662, 1173, 1332 and 2614 keV. The optical absorption spectra of some glass samples have been measured from 200 to 1100...

Glasses having composition (B2O3)25 (PbO)70 (Al2O3)5 (Sm2O3)x ,where x=0, 0.5, 1, 2, 3 and 5 g were prepared using the normal melt quench technique. Spectral reflectance and transmittance at normal incidence of the glass samples are recorded with a spectrophotometer in the spectral range 220–2200 nm. These measured values are introduced into analyt...

A glass system with chemical formula xBi2O3–(30−x)CdO–10B2O3–20Fe2O3–40P2O5 (0≤x≤30) wt% is prepared to be used as radiation shield. The mass attenuation coefficient and half value layer of the glass system to gamma rays have been measured experimentally and compared with those determined from theoretical calculations using the mixture rule of WinX...

Recent studies of the backbending phenomenon in medium light weight nuclei near A∼ 60 expanded greatly our interest about how the single particle orbits are nonlinearly affected by the collective motion. As a consequence we have applied a modified version of the exponential model in mass region at A ∼ 60. A firm conclusion is obtained concerning th...

The response of some SSNTDs was calculated theoretically taking into consideration the major parameters that affect them. These parameters are related to the behavior of alpha emitters, the detectors types and the used diffusion chambers. The obtained results showed that the response of the filtered CR-39 detector is about 5 times higher than that...

A modified version of the exponential model with paring attenuation is used to describe successfully the backbending of the moment of inertia, in even–even nuclei, in the region A = 100–192. The model fits remarkably well to the experimental observation with a few parameters.

Recent studies of the backbending phenomenon in medium light weight nuclei near A~60 expanded greatly our interest about how the single particle orbits are nonlinearly affected by the collective motion. As a consequence we have applied a modi…ed version of the exponential model with the inclusion of paring correlation to describe the energy spectra...

A modified version of the previously proposed exponential model with pairing attenuation for the well deformed even-even nuclei has been applied to predict the energy levels of doubly even actinide nuclei. Satisfactory results are obtained by that model as compared with the experimental results. The backbending phenomena are successfully described...

The effects of gamma-irradiation on the biophysical and morphological properties of corn plants were investigated. The irradiation doses were 0, 1, 1.5, 2.5, 5, and 10 krad. Corn grains exposed to 1.5 and 2.5 krad showed highly significant changes in all growth parameters. Fluorescence and light absorption spectra of chlorophyll attributed to diffe...

The glass system x Bi2O3 (30–x) CdO•10B2O3 •40P2O5 (x = 0, 5, 10, 15, 20, 25 and 30) is prepared to use as radiation shield. The attenuation properties of this glass system (Mass attenuation coefficients, effective atomic numbers and half value layers) have been determined experimentally and compared with those obtained from theoretical calculation...

The dosimetric characteristics of Li2B4O7 prepared in-house and doped with Cu are studied using the thermoluminescence (TL) technique. The temperature at which the TL is observed to be most intense is at 178°C. The pre-irradiation annealing condition is 300°C for 10 min while the corresponding value of the post-irradiation annealing is 300°C for 30...

New shielding alloys for gamma rays have been developed from a mixture of Cu, Fe, Pb and Al. The temperatures for the formation of these alloys were detected and their structures analysed by means of an x-ray diffraction spectrometer. The linear attenuation coefficients for the produced alloys at different thicknesses and various energy ranges have...

A study of the Coriolis force effect on the last odd particle in odd-Re isotopes is undertaken based on the cranking model and Nilsson model including pairing force. Accordingly, the level structure of the ground state bands of odd-mass Re isotopes is discussed and satisfactory results are obtained by that model as compared with the experimental re...

A study of the background gamma radiation spectrum in Ain Shams University buildings was performed for the energy range 50 keV–3 MeV using a hyperpure Ge-detector. The absolute dose for each gamma line was calculated and an estimation of the total absorbed dose for the detected gamma lines was obtained. Comparison with other results was also perfor...

The decay of154Eu to154Gd has been studied using H. P. Ge and H. P. Ge−NaI(Tl) spectrometers in coincidence measurements. 141 gamma transitions have been observed. One of these transitions is found to be new and has an energy of 202.5 keV. The 165.9, 202.5, 229.8 and 484.6 keV transitions are placed correctly in the decay scheme of154Eu. The levels...

The α decay of241 Am to237Np has been studied using Si(Li) and H.P.Ge−NaI(Tl) spectrometers in the low energy range 5–45 keV. Twelve gamma transitions have been observed. Two of these transitions are found to be new and have energies 28.52 and 40.44 keV. Furthermore, it was possible to confirm the placement of the 27.1 keV transition in the level s...

The excitation functions for proton elastic scattering of 70Ge have been measured in the energy range Ep=3.0-5.2 MeV in 10 keV steps at theta lab=90 degrees and 149 degrees . The isobaric analogue resonances of the parent states and the optical-model background were fitted simultaneously at all energies and angles to give an accurate estimation of...

Measurements and analysis of gamma-background radiation spectrum in four different places of Qatar University campus were performed at the energy range 10 keV–3 MeV using hyper pur Ge-detector. The dependence of the detector absolute photopeak efficiency on gamma-ray energies was determined and correction of the data for that was also done. The abs...

The decay of160Tb (72.2 d) to160Dy has been studied using H. P. Ge and H. P. Ge-NaI(Tl) coincidence spectrometers. Angular correlation measurements have been made to estimate the spins and parities of some levels as well as the mixing ratios of their gamma transitions. Forty gamma transitions have been observed having energies in the range from 86...

Different concentrations from copper were added to lithium borate, as a doping material to get a good dosimeter compatible with the commercial one. It was found that the gradual addition of Cu to Li 2 B 4 O 7 causes gradual enhancement in the TL intensity up to a concentration value of 0.023 wt%, above that a draw back on the TL intensity occurs. I...