Showing papers in "Nuclear Science and Techniques in 2006"

TL;DR: In this paper, the authors measured the activity concentrations of the naturally occurring radionuclides 226 Ra, 232 Th, and 40 K in sedimentary rock samples from Eastern Desert (Um El-Huetat), Nile Valley (Gebel Owina) and from southwest Sinai (Wadi Ghweiba) were measured using a high-purity germanium detector.

TL;DR: In this article, different samples of igneous and metamorphic rocks from Egypt and Germany have been considered to measure γ-ray activity concentrations due to naturally occurring, potentially hazardous radonuclides 226Ra, 232Th and 40K.

TL;DR: In this paper, the weight loss in vivo degradation of poly (lactide-co-glycolide) (PLGA) radiolabeled with 125I was investigated.

TL;DR: In this article, the authors dealt with heat transfer with high temperature (300-700°C) and low Pe number (20∼70), and heat transfer in an annulus.

TL;DR: A portable energy-dispersive spectrometer has been constructed which has yielded good results and Modified Gaussian-Newton algorithm is a classical method to solve nonlinear curve fitting problems, and it is used to compute absolute intensity of each detected characteristic line.

TL;DR: In this paper, the authors derived the film thickness, film mass flow rate along axial distribution, and critical heat flux (CHF) in vertical upward round tube on the basis of a separated flow model of annular flow.

TL;DR: In this paper, two kinds of soft X-ray spectroscopy are used as nondestructive methods to investigate multilayer structures modified by interdiffusion or by chemical reaction of adjoining layers in depth direction.

TL;DR: Examples of biometrics applications and trends of biometric research, together with industry development, are introduced, which illustrate the challenges and opportunities of this technology.

TL;DR: In this paper, the authors present the application of Geant4 package (Geant4.7.0, 2005) in medical physics and a novel technique, namely, hadrontherapy.

TL;DR: In this paper, the density of the N2 and H2 are quite high, which is critical for the stability of the nanobubbles and may have potential applications, such as hydrogen storage, incorporated with recent experimental method to controllably produce hydrogen nanobbles.

TL;DR: The results suggested that 99mTc-HMIBP may be a potential bone-imaging agent, and the biodistribution in rats and bone scan in rabbits were studied.

TL;DR: In this article, the specific activities of 226 Ra, 232 Th and 40 K in cereals, leguminosae, and flour were measured using γ-ray spectroscopy.

TL;DR: In this article, a MI-TAP-PRHRS code was developed to analyze steady and transient characteristics of the PRHRS, and the analysis showed that the code simulates steady characteristics very well.

TL;DR: The cytotoxicity of fullerene derivative, C 60 (OH) x, on Tetrahymena pyriformis was investigated and it was indicated that the fullerenols caused a dose-dependent growth inhibition of the cells and the destruction of the macronucleus.

TL;DR: Routine clinical PET radiopharmaceuticals for the noninvasive imaging of brain receptors, transporters, and enzymes are commonly labeled with positron emitting nuclides such as carbon-11 or fluorine-18.

TL;DR: In this paper, the chemical kinetics model was integrated with the conservation equations to form a computer code for simulating the sodium-concrete interactions, and good agreement of an overall transient behavior were obtained in a series of sodiumconcrete interaction experiment analysis.

TL;DR: In this article, a pinhole collimator has been used for high-resolution animal SPECT to provide better spatial resolution and detection efficiency in comparison with a parallel-hole Collimator.

TL;DR: X-ray absorption fine structure (XAFS) has experienced a rapid development in the last three decades and has proven to be a powerful structural characterization technique nowadays as mentioned in this paper, and the basic principles including the theory, the data analysis, and the experiments have been introduced in detail.

TL;DR: In this article, a general module was designed specifically for the routine synthesis of [ 18 F]FET, which could be suitable for the present two chemical methods with simple modifications, and the fluorinated intermediates and the final product were separated and purified using solid phase extraction (SPE) on the Sep-Pak silica plus cartridge instead of the timeconsuming high performance liquid chromatography (HPLC) procedures.

TL;DR: In this article, the dryout point of flow boiling in narrow annular channels under low mass flux with 1.55 mm and 1.05 mm annular gap, respectively, is conducted.

TL;DR: In this paper, the authors investigated the damage of low-energy ions to HeLa cells and particularly examined the relationship between apoptotic and necrotic effects and the low energy ion radiation.

TL;DR: In this article, the half-life for 79 Se decay was calculated by using the Logf 1u t systematics method, based on the data analysis and comparison with experimental data.

TL;DR: In this article, the authors simulate γ ray energy deposition for different incident energies with four different models using the tool GEANT4 (Geant4.7.0, 2005) developed by CERN (the Center of European Research of Nucleus).

TL;DR: In this paper, three new components of FeF 2, FeF 3, and Fe 3 C in the resultants were mainly investigated using the Mossbauer spectroscopy (MS) and X-ray diffraction (XRD) and transmission electron microscopy (TEM) respectively.

TL;DR: In this article, the steady-state natural circulation characteristics of a new type of pressurized water reactor were investigated through numerically solving the one-dimensional steady state single-phase conservative equations for the primary circuit and the steady state two-phase drift-flux conservative equation for the secondary side of the steam generator, and it was found that natural circulation mass flow rate was proportional to the exponential function of the power.

TL;DR: In this paper, the leaching behavior of simulated high level waste glass (90Nd/10), which can incorporate 16 wt.% simulated HLW in five kinds of geological media, such as granite, cement, bentonite, Fe3O4, etc.

TL;DR: In this paper, changes of surface shape, aggregate state, and microstructure of Apocynum fiber before and after irradiation were studied by XRD, IR, SEM, ESR, and solid state 13C CP/ MAS NMR.

TL;DR: A two-wavelength pyrometry device using ordinary array CCD (charge coupled device) to collect the radiation data in the horizontal and vertical directions has been developed for measuring the cathode surface temperature during the arc discharge as discussed by the authors.

TL;DR: In this article, a more general DEI equation was derived using simple concepts, and a DEI-PI-CT formula was proposed to explain the contour contrast caused by the extinction of refraction beam.

TL;DR: In this article, the authors presented a numerical model for the analysis of flow-induced instabilities in forced-convection steam generator, based on the assumption of homogeneous two-phase flow and thermodynamic equilibrium of the phases.