TY - JOUR. T1 - Integration of new biological and physical retrospective dosimetry methods into EU emergency response plans-joint RENEB and EURADOS inter-laboratory comparisons. AU - Ainsbury, Elizabeth. AU - Badie, Christophe. AU - Barnard, Stephen. AU - Manning, Grainne. AU - Moquet, Jayne. AU - Abend, Michael. AU - Antunes, Ana Catarina. AU - Barrios, Lleonard. AU - Bassinet, Celine. AU - Beinke, Christina. AU - Bortolin, Emanuela. AU - Bossin, Lily. AU - Bricknell, Clare. AU - Brzoska, Kamil. AU - Buraczewska, Iwona. AU - Castaño, Carlos Huertas. AU - Čemusová, Zina. AU - Christiansson, Maria. AU - Cordero, Santiago Mateos. AU - Cosler, Guillaume. AU - Monaca, Sara Della. AU - Desangles, François. AU - Discher, Michael. AU - Dominguez, Inmaculada. AU - Doucha-Senf, Sven. AU - Eakins, Jon. AU - Fattibene, Paola. AU - Filippi, Silvia. AU - Frenzel, Monika. AU - Georgieva, Dimka. AU - Gregoire, Eric. AU - Guogyte, Kamile. AU - Hadjidekova, Valeria. AU - Hadjiiska, Ljubomira. AU - Hristova, ...
There is provided a superconducting radiometry apparatus capable of performing, while sample-measuring, an energy correction in regard to a fluctuation of a peak value of an output signal, which is due to a radiation heat and a magnetic field from an outside. The superconducting radiometry apparatus is constituted by comprising a micro-calorie meter detecting an energy of a radiant ray as a temperature change, a signal detection mechanism for detecting a displacement of an electric current flowing to the micro-calorie meter, a shunt resistance which is connected in parallel to the micro-calorie meter and whose resistance value is smaller than the micro-calorie meter, a bias electric source connected to the micro-calorie meter and the shunt resistance and applying a constant voltage, a heat addition device adding a constant and already-known heat quantity to the micro-calorie meter, a peak value monitor measuring a peak value corresponding to an added heat quantity within an output signal from ...
article{d68a1cfe-bf19-48a0-af9e-709e06d7407b, abstract = {The single-aliquot regenerative-dose (SAR) protocols used in retrospective dosimetry for optically stimulated luminescence measurements have been mainly developed for archaeological and geological dating of quartz and feldspar. The aim in this study is to find a read-out protocol that can generate the most reproducible signal for household salt (NaCl) at absorbed doses below 100 mGy. The relation between the reproducibility of the signal, in terms of the ratio between given absorbed dose and SAR-calculated dose, and parameters such as test-dose pre-heat temperature has been studied. It was found that a temperature of 200°C yielded the best reproducibility in the SAR-calculated dose, which is a somewhat higher pre-heat temperature than what is used for dating of quartz.}, author = {Christiansson, Maria and Bernhardsson, Christian and Mattsson, Sören and Rääf, Christopher}, issn = {1742-3406}, language = {eng}, pages = {584--587}, ...
HUMAN RADIATION STUDIES: REMEMBERING THE EARLY YEARS Oral History of Health Physicist Karl Z. Morgan, Ph.D. Conducted January 7, 1995 By Marisa Caputo and Michael Yuffee United States Department of Energy Office of Human Radiation Experiments June 1995 FOREWORD n December 1993, U.S. Secretary of Energy Hazel R. OLeary announced her Openness Initiative. As part of this initiative, the Department of Energy undertook an effort to identify and catalog historical documents on radiation experiments that had used human subjects. The Office of Human Radiation Experiments coordinated the Departments search for records about these experiments. An enormous volume of historical records has been located. Many of these records were disorganized; often poorly cataloged, if at all; and scattered across the country in holding areas, archives, and records centers. The Department has produced a roadmap to the large universe of pertinent information: Human Radiation Experiments: The Department of Energy Roadmap ...
The harmonization process to set up and maintain an operational biological and physical retrospective dosimetry network : QA QM applied to the RENEB network. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
HUMAN RADIATION STUDIES: REMEMBERING THE EARLY YEARS Oral History of Biochemist Waldo E. Cohn, Ph.D. Conducted January 18, 1995 By Michael Yuffee and Tom Fisher United States Department of Energy Office of Human Radiation Experiments June 1995 FOREWORD n December 1993, U.S. Secretary of Energy Hazel R. OLeary announced her Openness Initiative. As part of this initiative, the Department of Energy undertook an effort to identify and catalog historical documents on radiation experiments that had used human subjects. The Office of Human Radiation Experiments coordinated the Departments search for records about these experiments. An enormous volume of historical records has been located. Many of these records were disorganized; often poorly cataloged, if at all; and scattered across the country in holding areas, archives, and records centers. The Department has produced a roadmap to the large universe of pertinent information: Human Radiation Experiments: The Department of Energy Roadmap to the ...
MCNP{trademark} and LAHET{trademark} are two of the codes included in the LARAMIE (Los Alamos Radiation Modeling Interactive Environment) code system. Both MCNP and LAHET are three-dimensional continuous-energy Monte Carlo radiation transport codes. The capabilities of MCNP and LAHET are currently being merged into one code for the Accelerator Production of Tritium (APT) program at Los Alamos National Laboratory. Concurrently, a significant effort is underway to improve the accuracy of the physics in the merged code. In particular, full nuclear-data evaluations (in ENDF6 format) for many materials of importance to APT are being produced for incident neutrons and protons up to an energy of 150-MeV. After processing, cross-section tables based on these new evaluations will be available for use fin the merged code. In order to utilize these new cross-section tables, significant enhancements are required for the merged code. Neutron cross-section tables for MCNP currently specify emission data for neutrons
Purpose: To build a Monte Carlo dose verification tool for IMRT Plan by implementing a irradiation source model into DPM code. Extend the ability of DPM to calculate any incident angles and irregular-inhomogeneous fields. Methods: With the virtual source and the energy spectrum which unfolded from the accelerator measurement data,combined with optimized intensity maps to calculate the dose distribution of the irradiation irregular-inhomogeneous field. The irradiation source model of accelerator was substituted by a grid-based surface source. The contour and the intensity distribution of the surface source were optimized by ARTS (Accurate/Advanced Radiotherapy System) optimization module based on the tumor configuration. The weight of the emitter was decided by the grid intensity. The direction of the emitter was decided by the combination of the virtual source and the emitter emitting position. The photon energy spectrum unfolded from the accelerator measurement data was adjusted by compensating ...
The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument is one of four instruments on NASAs TIMED (Thermosphere Ionosphere Mesosphere Energetics Dynamics) satellite. The primary goal of the SABER experiment is to provide the data needed to advance our understanding of the fundamental processes governing the energetics, chemistry, dynamics, and transport in the mesosphere and lower thermosphere. SABER accomplishes this with global measurements of the atmosphere using a 10-channel broadband limb-scanning infrared radiometer covering the spectral range from 1.27 µm to 17 µm. These measurements are used to provide vertical profiles of kinetic temperature, pressure, geopotential height, volume mixing ratios for the trace species O3, CO2, H2O, [O], and [H], volume emission rates for 5.3 µm NO, 2.1 µm OH, 1.6 µm OH, and 1.27 µm O2(1Δ), cooling and heating rates for many CO2, O3, and O2 bands, and chemical heating rates for 7 important reactions ...
Dosimetry for targeted radionuclide therapy is necessary for treatment planning and radiation protection. Currently, there are no standard methods either for performing dosimetry or to evaluate the uncertainties inherent in the dosimetric calculations. In this paper, we present an experimental method using polymer gel dosimeters, whereby absorbed-dose distributions resulting from nonuniform distributions of activity may be determined directly from T(2) magnetic resonance imaging (MRI) as well as from scintigraphic images. A phantom containing a nonuniform distribution of I-131 was prepared by mixing 58 MBq of activity within the gel as it was solidifying. The resulting absorbed-dose distribution was determined directly from the MRI and from sequential single-photon emission computed tomography (SPECT) images using the Medical Internal Radiation Dose (MIRD) schema. The MRI data were quantified using 12 calibration vials uniformly irradiated by 0-12 MBq of I-131. The agreement between the two ...
Based on the SPIE bestseller The Art of Radiometry by James M. Palmer and Barbara G. Grant, this Field Guide provides a practical, hands-on approach to the subject that the engineer, scientist, or student can use in real time. Readers of the earlier work will recognize similar topics in condensed form, along with many new figures and a chapter on photometry.. Written from a systems engineering perspective, this book covers topics in optical radiation propagation, material properties, sources, detectors, system components, measurement, calibration, and photometry. Appendices provide material on SI units, conversion factors, source luminance data, and many other subjects. The books organization and extensive collection of diagrams, tables and graphs will enable the reader to efficiently identify and apply relevant information to radiometric problems arising amid the demands of todays fast-paced technical environment. I gratefully acknowledge the contributions to my education and career from ...
Buy or Rent Absolute Radiometry: Electrically Calibrated Thermal Detectors of Optical Radiation as an eTextbook and get instant access.
The purpose with this book is to enable the reader to find solutions to real-world problems. The focus is on the application of radiometry in various analysis and design scenarios. It is essential, however, to build on the foundation of solid theoretical understanding, and gain insight beyond graphs, tables and equations. Therefore, this book does not attempt to provide an extensive set of ready-to-use equations and data, but rather strives to provide insight into hidden subtleties in the field. The atmosphere provides opportunity for a particularly rich set of intriguing observations.. The strict dictionary definition of radiometry is the measurement of optical flux. In this book, the term radiometry is used in its wider context to specifically cover the calculation of flux as well. This wider definition is commonly used by practitioners in the field to cover all forms of manipulation, including creation, measurement, calculation, modeling, and simulation of optical flux. The focus of this ...
Purpose: Positron-emitting isotope distributions can be used for the image fusion of the carbon ion planning CT and online target verification PETCT, after radiation in the same decay period,the relationship between the same target volume and the SUV value of different every single fraction dose can be found,then the range of SUV for the radiation target could be decided.So this online range also can provide reference for the correlation and consistency in planning target dose verification and evaluation for the clinical trial. Methods: The Rando head phantom can be used as real body,the 10cc cube volume target contouring is done,beam ISO Center depth is 7.6cm and the 90 degree fixed carbon ion beams should be delivered in single fraction effective dose of 2.5GyE,5GyE and 8GyE.After irradiation,390 seconds later the 30 minutes PET-CT scanning is performed,parameters are set to 50Kg virtual weight,0.05mCi activity.MIM Maestro is used for the image processing and fusion,five 16mm diameter SUV ...
Health,HOUSTON Dec. 20 2004 Dont let the odd name fool you FLUKA is seri...A course on FLUKA one of the top radiation transport computer codes i...Called a Monte Carlo Radiation Transport Code because of how it uses r... Our environment is constantly being bombarded by radiation billions ...FLUKA works by simulating a particular environment in great detail. F...,International,gathering,at,UH,examines,top,computer,code,medicine,medical news today,latest medical news,medical newsletters,current medical news,latest medicine news
We propose to determine the response of a newly developed laser heated, vycor glass fiberoptic radiation dosimetry system to ionizing radiation in a clinical radiotherapy environment. Present systems measure only total dose or have limitations, such as instability, non-linearity, excessive size or a decoupled measurement system, making them unsuitable in a variety of clinical applications. This fiberoptic coupled dosimetry system is a new and innovative technology application which allows on-line measurement of instantaneous dose rate and total dose never before achievable. It offers a clear advantage in patient treatment delivery, allowing on-line corrections essential to a new generation of radiotherapy treatment machines with development of beam intensity modulation as an adjunct to 3D conformal therapy. It also has the advantage of submillimeter size and is minimally invasive, making it ideal for brachytherapy.. This system has the potential for stable, accurate, reproducible, clinically ...
PURPOSE The hematopoietically active (or red) bone marrow is the target tissue assigned in skeletal dosimetry models for assessment of stochastic effects (leukemia induction) as well as tissue reactions (marrow toxicity). Active marrow, however, is in reality a surrogate tissue region for specific cell populations, namely the hematopoietic stem and progenitor cells. Present models of active marrow dosimetry implicitly assume that these cells are uniformly localized throughout the marrow spaces of trabecular spongiosa. Data from Watchman et al. and Bourke et al., however, clearly indicate that there is a substantial spatial concentration gradient of these cells with the highest concentrations localized near the bone trabeculae surfaces. The purpose of the present study was thus to explore the dosimetric implications of these spatial gradients on active marrow dosimetry. METHODS Images of several bone sites from a 45-yr female were retagged to group active marrow voxels into 50 μm increments of marrow
... ,The NOS assay kit measures NOS activity by monitoring the conversion of radiolabeled arginine to citrulline. This assay is simple, sensitive, and specific for NOS activity and can be used with both crude and purified enzyme preparations. The kit includes sufficient materials and reagents for 50 tot,biological,biology supply,biology supplies,biology product
Electron paramagnetic resonance (EPR) dosimetry using the well established dosimeter material alanine is a generally accepted dosimetric method for measurements of high absorbed doses. Alanine EPR dosimetry is however not sensitive enough for high precision measurements of low (, 5 Gy) absorbed doses using reasonably measurement times and small dosimeters. It has therefore not been possible to fully exploit the benefits of EPR dosimetry for applications in radiation therapy.. The aim of this thesis was to show that sensitive EPR dosimetry is a competitive method for applications in radiation therapy fulfilling the requirements of measurement precision. Our strategy for reaching this goal was to search for new, more sensitive, EPR dosimeter materials fulfilling the criteria of being tissue equivalent, having a high radical yield and having a narrow EPR spectrum suitable for dosimetry. The best materials were found among formates and dithionates. Doping with small amounts of metal ions and ...
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Introduction: In radiotherapy treatment planning system (TPS), basic input is the data from computed tomography (CT) scan, which takes into account the effect of inhomogeneities in dose calculations. Measurement of CT numbers may be affected by scanner-specific parameters. Therefore, it is important to verify the effect of different CT scanning protocols on Hounsfield unit (HU) and its impact on dose calculation. This study was carried out to analyse the effect of different tube voltages on HU for various tissue substitutes in phantom and their dosimetric impact on dose calculation in TPS due to variation in HU-relative electron density (RED) calibration curves. Materials and Methods: HU for different density materials was obtained from CT images of the phantom acquired at various tube voltages. HU-RED calibration curves were drawn from CT images with various tissue substitutes acquired at different tube voltages used to quantify the error in dose calculation for different algorithms. Doses were
Definition of free-air ionization chamber in the Legal Dictionary - by Free online English dictionary and encyclopedia. What is free-air ionization chamber? Meaning of free-air ionization chamber as a legal term. What does free-air ionization chamber mean in law?
TY - JOUR. T1 - Dose estimation for repeated phosphorus-32 ingestion in human subjects. AU - Chao, J. H.. AU - Tseng, C. L.. AU - Hsieh, W. A.. AU - Hung, D. Z.. AU - Chang, W. P.. PY - 2001/1/15. Y1 - 2001/1/15. N2 - Dose estimation was conducted for internal phosphorus-32 exposure in one young male subject from repeated oral mis-ingestion for ,1 year. Since disclosure for previous continuous contamination, a series of urine samples were collected from this individual weekly for a period of ,2 months. P-32 radioactivity in urine samples were measured by the acid precipitation method. Estimation for retrospective total effective dose equivalent received by this subject was conducted for cumulative internal dose estimation. A minimum of 9.4 mSv was estimated for an assumed single ingestion. As this was a rare case in radiation protection and internal radiation dosimetry, its implications were of considerable significance. (C) 2000 Elsevier Science Ltd.. AB - Dose estimation was conducted for ...
The overall aim of the Concerted Action RBDATA-EULEP is to provide information to improve the assessments of intakes of radionuclides and of the resulting doses. This involves a review of the behaviour of radionuclides following intake, and the transfer of expertise on methodology by organising small training workshops. The main activity is the development of an electronic database, effectively an annotated bibliography, but the electronic format used facilitates extension, updating, and information retrieval. It consists of linked tables of references and experiments, with details and comments on the materials, procedures and results. By June 2002 it contained information on 524 inhalation, 282 ingestion and 164 injection experiments from 391 references. It will be extended, and Internet access provided. Prospective users include: groups developing standards for internal dosimetry, scientists conducting research on radionuclide biokinetics, and health physicists assessing the consequences of ...
Traceable calibration of a therapy-level dosemeter in terms of absorbed dose to water or air kerma. The service is available for thimble chambers or thin-window chambers, and offered in spring of each year.
July 2013 - First observations of atomic species in the MLT by SABER provide unique dataset for testing climate models and assessing basic understanding of the atmosphere on the edge of space. Earths mesospause region between 80 and 100 km altitude is unique because it is the lowest part of the atmosphere in which atoms are a permanent and significant part of the atmospheres composition. Specifically, atomic oxygen [O] and atomic hydrogen [H] are present in significant amounts, and in the case of [O], comprise up to 1% of the composition. These two species are critically important to the mesopause region because they govern the flow of energy from the Sun to the atmosphere. Ironically, both [O] and [H] are extremely difficult to observe from orbiting satellites because they do not readily emit energy that can be detected by conventional satellite instruments. The [O] and [H] abundances have been derived from measurements of ozone (O3) and hydroxyl (OH) which are directly and chemically related ...
Fig. 4. Detailed views of the deeper-water carbonates (Units A, B, C) and the calcareous marls to marlstones of the Marlstone member from the Kasımlar Formation of the Aşağiyaylabel (AS I, AS IV) and Karapinar (KA I-II & IV) sections. Well-bedded Kasimlarceltites beds at the base of the Kasımlar Formation (Carbonate member, Unit A) at the sections (a) AS I, (b) AS IV, (c) KA I and (d) KA II. Julian/Tuvalian boundary (Lower/Upper Carnian boundary) at the carbonate/marl transitional intervals at the sections (e) AS I and (f) KA IV within the Kasımlar Formations at the top of Unit C, below the Marlstone member. (g) Characteristic marls of the Marlstone member (AS I) within the Kasımlar Formation bearing the abundant Tuvalian ammonoid Paratropites cf. hoetzendorfii. (h) Layer with accumulation of the bivalve Halobia and pyrite cubes within the Marlstone member from AS I. (i) Sandstone layer of the Marlstone member, AS I. (j) Breccia layer with shallow-water components within the Marlstone ...
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 3.0 Unported ...
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 3.0 Unported ...
Purpose: Size, shape, and the position of paired organs are different in abdomen. However, the counterpart organs are conventionally treated jointly together in internal dosimetry. This study was performed to quantify the difference of specific absor
For over 65 years, PerkinElmer has been a leading provider and partner for radiometric detection solutions ranging from instruments and radiochemicals, to liquid scintillation cocktails, vials, and microplates.
Today, dosimeters are used generally for dosimetry of the diagnostic X-ray beam. Ionization chambers are appropriate instruments for monitoring and also the dosimetry of X-ray beam in medical diagnostic equipment. The present work introduces design and investigation of a new ring-shaped monitor chamber with a PMMA body, graphite-coated PMMA windows (0.5 mm thick), a special graphite-foil central electrode (0.1 mm thick, 0.7 g/cm3 dense) that creating two sensitive volumes and a central hole for crossing the radiation beam with less attenuation. The results of performance tests conducted at the Nuclear Science and Technology Research Institute, AEOI in Karaj- Iran proved the high short and long-term stability, the very low leakage current, the low directional dependence and very high ion collection efficiency through the special design of the collecting electrode. Moreover, the FLUKA Monte Carlo simulations certified the negligible effect of central electrode on this new ring-shaped monitor chamber.
A simple and convenient assay for indoleamine 2,3-dioxygenase has been developed. This depends on the conversion of D-[ring-2-14C]tryptophan to [14C]formate, excess substrate is removed by adsorption onto charcoal. This assay, which is 20-fold more sensitive than previous procedures, is applicable both to crude extracts and to large numbers of samples. Activity in rat tissues is very much lower than in those of the rabbit; measureable activity is found only in the stomach, spleen, intestine and kidney. Enzyme activity in the rat intestine was increased by 50% in rats pretreated with L-tryptophan. ...
Grid size defines the number of grid tiles in x and y for statistics to run on. For example, a grid size of 10 will result in 100 grid tiles (10 in x, 10 in y). Depending on the scene, this can have a big affect. For example, frames with relatively contiguous radiometry can use small grid sizes. "Complex" scenes, such as a frame containing water, urban, and rural/vegatated areas, usually require a higher grid size/density to prevent one radiometrically contiguous area from affecting another area. For example, consider a patch of dark green vegetation surrounded by say, lighter colored grain crops. If the grid size is significantly larger than the dark green patch, the output (depending on the constraints applied) will wash out the dark green because of the statistical influence of the DN values of the lighter colored grains. However, sometimes the problem outlined in this example can be impossible to avoid! This is why dodging is both an science and an art ...
Electron paramagnetic resonance (EPR) dosimetry using the well established dosimeter material alanine is a generally accepted dosimetric method for measurements of high absorbed doses. Alanine EPR dosimetry is however not sensitive enough for high precision measurements of low (, 5 Gy) absorbed doses using reasonably measurement times and small dosimeters. It has therefore not been possible to fully exploit the benefits of EPR dosimetry for applications in radiation therapy.. The aim of this thesis was to show that sensitive EPR dosimetry is a competitive method for applications in radiation therapy fulfilling the requirements of measurement precision. Our strategy for reaching this goal was to search for new, more sensitive, EPR dosimeter materials fulfilling the criteria of being tissue equivalent, having a high radical yield and having a narrow EPR spectrum suitable for dosimetry. The best materials were found among formates and dithionates. Doping with small amounts of metal ions and ...
Malinen, Eirik; Vestad, Tor Arne; Hult, Elin Agathe; Hole, Eli Olaug & Sagstuen, Einar (2004). Estimation of X-ray beam quality by electron paramagnetic resonance (EPR) spectroscopy. Applied Radiation and Isotopes. ISSN 0969-8043. 60, s 929- 937 Vis sammendrag A novel dosimetry system using EPR spectroscopy to determine X-ray beam quality is proposed. The composite dosimetry system is a mixture of two polycrystalline substances, where the two materials have different X-ray absorption properties. The composite dosimeters, consisting of polycrystalline lithium formate monohydrate and calcium formate, were prepared as pellets, X-irradiated and analyzed with EPR spectroscopy. Taking the ratio between the EPR intensities of the two substances constituting the dosimeter, a measure of the beam quality was obtained in terms of the equivalent photon energy. The intensity ratio was calculated by a simple EPR spectrum reconstruction method. Plotting the logarithm of the EPR intensity ratio against the ...
2010 AAPM Annual Meeting Allen Li For more information about the American Association of Physicists in Medicine, visit http://www.aapm.org/ The goal of…
v. VEGETATION-2. The time series of extractions covers the years: 2006 to 2009. These data were distributed in a predefined format and constitute what is hereafter called the reference dataset. Each participating team applied its vicarious calibration methodologies and/or sensor-to-sensor radiometric intercomparison methodologies to this reference dataset. MERIS data (2nd reprocessing) were chosen as a radiometric reference to which other sensor radiometry was compared. The comparison was carried out for each methodology and for each site using standardised statistical indicators associated to the time series of radiometric differences between MERIS and other sensors. Reference Dataset is available: You are welcome to download the reference dataset, sensor spectral responses and a ReadMe from: [DOWNLOAD DATASET HERE]. The reference dataset is fully described in the WG4 Final Report. It was generated from three separate data sources; DIMITRI (maintained by ESA and ARGANS), SADE (CNES) and RAL. It ...
Radiography and radiometry can be carried out without shutting down the plant and the radiation beam does not interfere with operation.
Chip sorter is one of packaging facilities in chip manufactory. Defects will occur for a few of chips during manufacturing processes. If the size of chip defects is larger than a criterion of impacting chip quality, these flawed chips have to be detected and removed. Defects inspection system is usually developed with frame CCD imagers. Therere some drawbacks for this system, such as mechanism of pause type for image acquisition, complicated acquisition control, easy damage for moving components, etc. And acquired images per chip have to be processed in radiometry and geometry and then pieced together before inspection. These processes impact the accuracy and efficiency of defects inspection. So approaches of image acquisition system and its opto-mechanical module will be critical for inspection system. In this article, design and characterization of a new image acquisition system and its opto-mechanical module are presented. Defects with size of greater than 15μm have to be inspected. ...
Optical radiometry is the science of light measurement, spanning across the ultraviolet, visible and infrared regions of the electromagnetic spectrum. Ph...
We introduce a class of robust non-parametric estimation methods which are ideally suited for the reconstruction of signals and images from noise-corrupted or sparsely collected samples. The filters derived from this class are locally adapted kernels which take into account both the local density of the available samples, and the actual values of these samples. As such, they are automatically steered and adapted to both the given sampling "geometry", and the samples "radiometry". As the framework we proposed does not rely upon specific assumptions about noise or sampling distributions, it is applicable to a wide class of problems ...
In radio, a continuous sequence of broadcasting frequencies within given limits. In radiometry, a relatively narrow region of the electromagnetic spectrum to which a remote sensor responds; a multispectral sensor makes measurements in a number of spectral bands.
The Eckert & Ziegler Group is one of the worlds largest providers of isotope technology for medical, scientific and industrial use. The core businesses of the Group are cancer therapy, industrial radiometry and nuclear-medical imaging. The three business segments are ...
1997 Erythropoietin (EPO), a drug widely used in the treatment of anemia associated with cancer, has been shown to be neuroprotective against a wide variety of neurologic insults when administered systemically. The central nervous system (CNS) is a dose-limiting organ in cancer radiotherapy (XRT). Neuro-cognitive dysfunction is irreversible, and represents a major cause of morbidity following cranial XRT. We have recently showed that EPO (5000 u/Kg) administered intraperitoneally (ip) 1 h after cranial XRT reduced both early and late behavioral and neurocognitive impairment in mice. Given the pleiotropic effects of EPO in the injured CNS, experiments were performed to determine the underlying mechanisms of these neuroprotective effects of EPO following cranial XRT. Adult C57BL/129S mice were given graded single doses of X-ray to the whole brain. EPO at doses of 1000, 5000 or 10,000 u/Kg was given i.p.1 h after XRT. XRT induced a robust apoptotic response in the subgranular zone of the mouse ...
A method and apparatus for determining an optimized radiation beam arrangement for applying radiation to a tumor target volume while minimizing radiation of a structure volume in a patient, comprising
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As a clinically established secondary check software that allows independent point dose verification calculations for a wide range of treatrment plans, DIAMOND® offers a perfect addition to PTW OCTAVIUS systems in clinical routine cases. ...
Performance of the DT-236/PD and CP-696/UD dosimetry system has been studied in preliminary tests at AFRRI in cobalt-60 and in TRIGA-reactor radiation fields. The test results are relevant to the reproducibility of the dosimeter reader, the variability of readings among identically irradiated of dosimeter response in the AFFRI radiation fields. The performance specifications for this system list + or - 40% accuracy at doses of 50-1000 rads and + or - 20- rad accuracy at 0-50 rads. The present tests showed the system to be capable of meeting these specifications and, with care, a level of accuracy of + or - 10% to 20% was achieved at high doses. At low doses, the accuracy of the system was limited by the + or - 20-rad (2 SD) variability in readings of nonirradiated dosimeters. Factors found to improve the precision of dosimeter readings were (a) warm-up time of several hours for the reader unit, (B) sustained firm pressure on the mechanical switch that initiates the read cycle, (c) triplicate readings
A good MOSFET should have a reading of 0.4V to 0.9V (depends on the MOSFET type). If the reading is zero, the MOSFET is defective. When the reading is "open" or no reading, the MOSFET is also defective. When you reverse the DMM probe connections, the reading should be "open" or no reading for a good MOSFET ...