A5068295466- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Radiation Dose and Imaging
- Luminescence Properties of Advanced Materials
- Advanced Radiotherapy Techniques
- Radioactivity and Radon Measurements
- Medical Imaging Techniques and Applications
- Glass properties and applications
- Quantum chaos and dynamical systems
- Numerical methods for differential equations
- Radioactive contamination and transfer
- Chemical Thermodynamics and Molecular Structure
- Radiation Effects and Dosimetry
- Nuclear materials and radiation effects
- Advanced X-ray and CT Imaging
- Atomic and Subatomic Physics Research
- Radiation Effects in Electronics
- Particle Detector Development and Performance
- Radioactive Decay and Measurement Techniques
- Advanced Chemical Physics Studies
- Fusion materials and technologies
- Nuclear physics research studies
- Advanced Numerical Methods in Computational Mathematics
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2014-2024
Istituto Nazionale di Fisica Nucleare
2008-2024
Universidad Complutense de Madrid
2014-2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2014-2023
Unidades Centrales Científico-Técnicas
1988-2021
Universitat de València
1995-2015
Instituto de Física Corpuscular
2001-2011
Universidad de Granada
1980-2008
Universitat Jaume I
1993
Universidade Estadual Paulista (Unesp)
1992
Thermoluminescence glow-curve deconvolution (GCD) functions are proposed for first, second and general orders of kinetics. The free parameters the GCD maximum peak intensity temperature , which can be obtained experimentally. activation energy (E) order kinetics (b) in case additional parameters.
We develop a Magnus expansion well suited for Floquet theory of linear ordinary differential equations with periodic coefficients. build up recursive scheme to obtain the terms in new and give an explicit sufficient condition its convergence. The method formulae are applied illustrative example from quantum mechanics.
Abstract Thirteen different computer programs for glow curve analysis are compared. Eleven programmes used a shape of the peak based on Randall-Wilkins model, but variety approximations evaluating was noticed. Twelve were able to reproduce areas and activation energies synthetic according model simulating four peaks TLD-100 within 6.3%. Four those twelve input values 0.4%. Clear differences in performance between due calculating shape.
Time-dependent perturbation theory as a tool to compute approximate solutions of the Schrödinger equation does not preserve unitarity. Here we present, in simple way, how Magnus expansion (also known exponential theory) provides such unitary solutions. The purpose is illustrate importance and consequences property. We suggest that may be introduced students advanced courses quantum mechanics.
In this work, the dose equivalent due to photoneutrons and neutron spectra in tissue was calculated for various linacs (Varian Clinac 2100C, Elekta Inor, SL25 Siemens Mevatron KDS) operating at energies between 15 20 MV, using Monte Carlo code MCNPX (v. 2.5). The an ICRU phantom has been anteroposterior treatments with a detailed simulation of geometry linac head coupled electron–photon–neutron transport. Neutron entrance 1-cm depth phantom, distribution fluence beam axis distributions...
Neutron personal dosimetry is necessary for the monitoring of exposed workers, not only in nuclear industry and related activities but also growing number neutron producing facilities, so new techniques devices are continuously developed improved. This article provides a review present state-of-the-art as well main results innovative developments using electronic dosimeters (EPDs), track (etched dosimeters, FNTD), luminescent (TL, OSL, RPL), superheated drop direct ion storage (DIS) dosimeters.
Some accurate glow curve fitting functions for general and mixed order kinetics peaks are proposed discussed. These mathematical expressions used together with peak search non-linear minimisation algorithms in to provide a fast deconvolution those materials which cannot be well fitted using first kinetics. To test the accuracy of method. result synthetic curves is compared original data giving negligible errors values parameters currently found TL materials.
The paper describes dosimetric models that allow the estimation of average radiation exposures to terrestrial biota due environmental sources in soil as well internal uniform distributions radionuclides. Simple three-dimensional phantoms for 13 faunal reference organisms are specified. calculation absorbed dose per unit source strength these targets is based on photon and electron transport simulations using Monte Carlo method. presented rate conversion coefficients derived species. This...
A dose per unit concentration database has been generated for application to ecosystem assessments within the FASSET framework. Organisms are represented by ellipsoids of appropriate dimensions, and proportion radiation absorbed organisms is calculated using a numerical method implemented in series spreadsheet-based programs. Energy-dependent fraction functions have derived calculating total radionuclides present biota or media they inhabit. All reference organism dimensions defined marine...
The number of conditions to be satisfied by the operators K and P in symplectic integrators with processing, given ePe-hKe-P , is determined for a Hamiltonian form $H={\cal A}+{\cal B}$. are explicitly written up order six used obtain more efficient methods fewer evaluations per step than other integrators. Special cases which kernel drastically reduced also studied. It shown that completely determines optimal method one can processing.
Numerical solutions of the differential equations system describing transitions between energy levels can help in understanding physical mechanisms governing thermoluminescence (TL) emission but they are not suitable for analysis complex experimental TL glow curves. On other hand, simplified descriptions, as mixed or general order kinetics, require many additional assumptions that may limit validity results mostly empirical. In this paper, accuracy such approximations has been evaluated...