A5101499227- Radiation Dose and Imaging
- Advanced X-ray and CT Imaging
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Advanced Radiotherapy Techniques
- Meteorological Phenomena and Simulations
- Radiology practices and education
- Atmospheric Ozone and Climate
- Nuclear Physics and Applications
- Digital Radiography and Breast Imaging
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Planetary Science and Exploration
- Radioactivity and Radon Measurements
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Galaxies: Formation, Evolution, Phenomena
- Particle physics theoretical and experimental studies
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Ion-surface interactions and analysis
- Calibration and Measurement Techniques
Unidades Centrales Científico-Técnicas
2022-2025
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2007-2025
Universidad EAFIT
2025
Universidad de Santiago de Chile
2024
Institut Català d'Oncologia
2024
Universidad de La Laguna
2022
European Organization for Nuclear Research
2017-2021
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2015-2020
San Diego State University
2016-2020
General Atomics (United States)
2018-2020
The aim of this work has been to determine typical occupational dose levels in interventional radiology and cardiology installations relate doses patient dosimetry through the dose-area product. An experimental correlation between environmental dosimetric records products centres studied was established. study covered a sample 83 procedures performed by 10 specialists six laboratories. radiologists cardiologists monitored wore nine thermoluminescent chips next eyes, forehead, neck, hands,...
This paper reports on a new satellite sensor, the Geostationary Earth Radiation Budget (GERB) experiment. GERB is designed to make first measurements of Earth's radiation budget from geostationary orbit. Measurements at high absolute accuracy reflected sunlight Earth, and thermal emitted by are made every 15 min, with spatial resolution subsatellite point 44.6 km (north–south) 39.3 (east–west). With knowledge incoming solar constant, this gives primary forcing response components...
This report describes occupational radiation doses of interventional cardiologists over 15 years and assesses action undertaken to optimize protection. Personal dosimetry records nine staff eight cardiology fellows were recorded using personal dosemeters worn under their lead aprons. The hospital in which this study was conducted currently performs 5000 procedures per year. has improved its facilities since 1989, when it had two old-fashioned theatres, include four rooms with more advanced...
ABSTRACT We present ground-based optical photometric monitoring data for NGC 5548, part of an extended multiwavelength reverberation mapping campaign. The light curves have nearly daily cadence from 2014 January to July in nine filters ( BVRI and ugriz ). Combined with ultraviolet the Hubble Space Telescope Swift , we confirm significant time delays between continuum bands as a function wavelength, extending wavelength coverage 1158 Å z band (~9160 Å). find that lags at wavelengths longer...
The increase in yearly particulate matter concentrations has been a constant issue since 2017 the Aburrá Valley, located Antioquia, Colombia. Although local certified air quality monitors provide high accuracy, they are limited spatial coverage, limiting chemical transport and pollution dynamic studies this mountainous environment. In work, local, Low-Cost Sensor network is proposed as an alternative installed around valley representative locations heights. To calibrate PM2.5 O3 sensors used...
Abstract Large exposures incurred in interventional radiology procedures make it advisable to establish reference dose values. These values should be quoted quantities representative of the radiological risk patient. In Spain, measurement methods were developed comply with European Directive on Patient Protection. Dose-area product and, when feasible, surface using thermoluminescent dosimetry chips measured. Both approaches are discussed, as well their potential use patient protection...
Coronary angiography and percutaneous transluminal coronary angioplasty procedures performed in four different facilities were monitored the present study by measuring maximum skin dose, dose-area product other operational parameters. Radiographic slow film, thermoluminescent dosemeters transmission ion chambers used to measure dose related quantities. Values of 107-711 mGy for 27.3-370.6 Gy cm2 found, together with cumulative estimates 110-3706 mGy. A discussion relationship measured values...
Secondary electron yield (SEY) curves in the 0-1000 eV range were measured on polycrystalline Ag, Au and Cu samples. The metals examined as introduced ultra-high vacuum chamber after having been cleaned by Ar+ ion sputtering. comparison between clean samples presence of contaminants, due to permanence atmosphere, confirmed that SEY behavior is strongly influenced chemical state metal surface. We show when using very slow primary electrons sample work function can be determined with high...
ABSTRACT During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, normally highly correlated far continuum and broad emission line variations decorrelated for ∼60–70 days, starting ∼75 days after first HST /COS observation. Following this anomalous state, flux variability lines returned a more normal state. This transient behavior, characterized by significant deficits in...
Patient and staff dose values in an interventional cardiology laboratory for different operational modes several patient thicknesses (from 16 to 28 cm, simulated using polymethylmethacrylate) are presented. When increasing depending on fluoroscopy cine modes, occupational doses can increase >30 times the baseline level. Scatter rates at cardiologist's position with no radiation protective tools ranged from 1 14 mSv h−1 fluoroscopy, 10 47 during acquisition. entrance surface air kerma...
The secondary electron yield for low primary-electron energies is shown to strongly depend on the exact surface conditions, with significant implications threshold of electron-cloud build up in proton storage rings.
We model the ultraviolet spectra of Seyfert 1 galaxy NGC~5548 obtained with Hubble Space Telescope during 6-month reverberation-mapping campaign in 2014. Our emission from NGC 5548 corrects for overlying absorption and deblends individual lines. Using modeled spectra, we measure response to continuum variations deblended absorption-corrected broad lines, velocity-dependent profiles Ly$\alpha$ C IV, narrow intrinsic features. find that time lags corrected lines are comparable those original...
We present geometric and dynamical modeling of the broad line region for multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photometric spectroscopic monitoring optical ultraviolet, covering H$\beta$, C IV, Ly$\alpha$ emission lines. find an extended disk-like H$\beta$ BLR with a mixture near-circular outflowing gas trajectories, while IV BLRs are much less resemble shell-like structures. There is clear radial structure BLR, arising at smaller...
A method for the evaluation of patient doses in interventional radiology procedures is presented and discussed. The requires analysis slow non-screen films such as those used radiotherapy. Dose area product skin dose can be estimated with fair accuracy depending on procedure type. agreement between film diamentor measurement better than 5% after application appropriate corrections. cost reasonable (pounds 5 per film) making it a worthwhile option dosimetry, especially when X-ray equipment...
Interventional cardiology procedures usually imply high doses to the staff, as paediatric cardiologists need stay closer patient than during adult procedures. Also, biplane systems are used that an additional source of staff doses. The objective this paper is measure scatter in four X-ray systems, using polymethyl methacrylate phantoms with thicknesses ranging from 4 16 cm simulate patients, for different acquisition modes. Scatter dose rates measured at position cardiologist's eyes ranged...
Abstract The method used to estimate the unfiltered shortwave broadband radiance from filtered radiances measured by Geostationary Earth Radiation Budget (GERB) instrument is presented. This unfiltering generate first released edition of GERB-2 dataset. involves a set regressions between factor (i.e., ratio and radiances) narrowband observations Spinning Enhanced Visible Infrared Imager (SEVIRI) instrument. are theoretically derived large database simulated spectral curves obtained radiative...
The relative cross section for ${\mathrm{Ni}}^{58}(n, p){\mathrm{Co}}^{58}$ has been measured by an activation method neutron energies of 2.2 to 3.6 Mev. absolute at 3.55-Mev energy is found be 195\ifmmode\pm\else\textpm\fi{}30 mb comparing the intensity 810-kev gamma ray ${\mathrm{Co}}^{58}$ with amount ${\mathrm{Si}}^{31}$ formed in ${\mathrm{P}}^{31}(n, p){\mathrm{Si}}^{31}$ reaction, which a previously known 96.2\ifmmode\pm\else\textpm\fi{}9.0 mb. rises from 140 Mev maximum value 214 3.0...
MCBXF magnets are orbit nested correctors for the HL-LHC project, an upgrade of Large Hadron Collider (LHC). The magnet design consists two dipoles, with aperture 150 mm. have been designed in physical lengths, namely 2.5 m (MCBXFA) and 1.5 (MCBXFB), same cross section according to necessities. Two prototypes first series short version were manufactured at CIEMAT assembled CERN. production rest magnets, 6 long 11 (MCBXFB) is being carried out premises company Elytt Energy. In this paper...
The present work describes an experiment undertaken using thermoluminescent dosemeters to obtain a local reference dose level in orthopantomography, based on patient measurements 11 dentistry installations. In addition, critical audit of the recommended by International Atomic Energy Agency for intraoral X-ray diagnostics is performed, data gathered from over 300 facilities. provisional levels proposed are 0.7 mGy entrance surface at occipital region orthopantomography and 3.5 radiology.