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Author : R. A. Guilmette
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.3/5 (91 download)
Download or read book Respiratory Tract Dosimetry written by R. A. Guilmette and published by . This book was released on 1991 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (641 download)
Download or read book Respiratory Tract Dosimetry written by and published by . This book was released on 1991 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (727 download)
Download or read book Respiratory Tract Clearance Model for Dosimetry and Bioassay of Inhaled Radionuclides written by and published by . This book was released on 1990 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ICRP Task Group on Respiratory Tract Models is developing a model to describe the retention and clearance of deposited radionuclides for dose-intake calculations and interpretation of bioassay data. Clearance from each region is treated as competition between mechanical transport, which moves particles to the gastro-intestinal tract and lymph nodes, and the translocation of material to blood. It is assumed that mechanical transport rates are the same for all materials, and that rates of translocation to blood are the same in all regions. Time-dependent clearance is represented by combinations of compartments. Representative values of parameters to describe mechanical transport from the human respiratory tract have been estimated, and guidance is given on the determination of translocation rates. It is emphasized that the current version of the model described here is still provisional. 30 refs.
Author : Robert Allan Corns
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (428 download)
Download or read book An Implementation of the ICRP66 Respiratory Tract Model in Internal Dosimetry written by Robert Allan Corns and published by . This book was released on 1996 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This treatise examines the ICRP's new respiratory tract model and its implementation into G scENMOD, a program that facilitates internal dosimetric calculation for the body. The inclusion of the ICRP66 model into G scENMOD improves the radiation dose estimates to the respiratory tract. The accuracy of this implementation was confirmed by validating G scENMOD's output against results published in ICRP66." --
Author : Dan Foy Holleman
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (643 download)
Download or read book Radiation Dosimetry for the Respiratory Tract of Uranium Miners written by Dan Foy Holleman and published by . This book was released on 1968 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (925 download)
Download or read book Radiation Dosimetry for the Respiratory Tract for Uranium Miners written by and published by . This book was released on 1969 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Factors affecting the radiation dose to the respiratory tract of uranium miners were investigated. These included atmospheric constitution, deposition of radioactivity in the respiratory tract and physiological translocation. Several aspects of the uranium mine atmosphere were considered, such as radon and radon daughter activity concentrations, physical form and activity-size distribution of the radon daughters, relative humidity and air temperature. Activity concentrations were found to be extremely variable, however, the remaining atmospheric factors were reasonably stable. Less than ten percent of the radon daughters were unattached. The attached fraction could apparently be represented by a mean diffusion coefficient of 1.3 x 10−5 cm2/sec or an aerodynamic size of 0.067 microns. This diffusion coefficient was not significantly affected by the presence of atmospheric particles produced during normal mining operations. Total and regional deposition percentages were determined experimentally as well as theoretically. Percent total deposition values for individual radon daughters were 50, 45 and 41 for radium-A, radium-B and radium-C, respectively, for an average respiration rate of 18 min−1 and an average tidal volume of 1.2 liters. The influence of respiration rate and tidal volume upon total deposition was examined. Regional deposition fractions for the nasal cavity, tracheobronchial and pulmonary regions were 22, 15 and 63 percent of the total deposited activity, respectively, for nose-breathing. Physiological translocation of respiratory deposited activity was investigated for various regions of the respiratory system. Results indicated that ciliary translocation was of negligible importance in the dosimetry of inhaled radon daughters.
Author :
Publisher :
ISBN 13 : 9780929600543
Total Pages : 253 pages
Book Rating : 4.6/5 (5 download)
Download or read book Deposition, retention and dosimetry of inhaled radioactive substances written by and published by . This book was released on 1997 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (683 download)
Download or read book Comparison of Old and New ICRP Models for Respiratory Tract Dosimetry written by and published by . This book was released on 1993 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper examines the historical development and application of respiratory tract dosimetry models by the International Commission for Radiological Protection, ICRP, for health protection from inhaled radioactive aerosols. Three different models are discussed, those that were included in ICRP recommendations published in 1960 and 1979, and the new ICRP Publication 66. Basic features of these models are compared and contrasted. These features include model structure, sites and frequencies of particle deposition, processes and rates of clearance of the deposited material from the respiratory tract, and consideration of the parameters involved in these processes and how various factors can influence these parameters. All three models lead to the calculation of absorbed radiation doses with differing degrees of regional and local specificity. These calculations are achieved using different tools ranging from quick hand calculations to sophisticated computerized modeling approaches. A side-by-side review of these models indicates several important trends in respiratory tract dosimetry models, the most obvious of which is the increased complexity of each new model over the past 30+ years. These increases reflect both the increasing size of the knowledge base derived from studies in laboratory animals and in human subjects and the need for models more broadly applicable for both occupational and environmental exposures. It is likely that future research will be directed to those key aspects of the new model having the largest uncertainties. The detailed design of the new model and its associated software provide excellent means of identifying useful research areas and using the resulting new information in organized and productive ways.
Author : Eduardo Farfan
Publisher :
ISBN 13 :
Total Pages : 870 pages
Book Rating : 4.:/5 (58 download)
Download or read book Probabilistic Respiratory Tract Dosimetry Model with Application to Beta-particle and Photon Emitters written by Eduardo Farfan and published by . This book was released on 2002 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : FJ. Miller
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (125 download)
Download or read book Exercise and Regional Dosimetry written by FJ. Miller and published by . This book was released on 1989 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Regional respiratory tract dosimetry is an important consideration when examining susceptibility to inhaled gases and particles. In this overview, an orientation is provided on the major anatomical ventilatory and physiologic factors that affect regional respiratory tract dosimetry. The influence of these factors and the physical laws governing deposition exhibit complex relationships for the extrathoracic, tracheobronchial, and pulmonary regions of the respiratory tract. Specific examples of regional dosimetry of insoluble and hygroscopic particles and an oxidant gas are presented to help identify critical issues and research areas related to susceptibility to inhaled pollutants.
Author : James D. Crapo
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (91 download)
Download or read book Extrapolation of Dosimetric Relationships for Inhaled Particles and Gases written by James D. Crapo and published by . This book was released on 1989 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extrapolation Modeling, Advancements and Research Issues in Lung Dosimetry; Lung Structure, Function Relationships; Species Differences in Airway Cell Distribution and Morphology; Alternative Methods to Evaluate Species Differences in Upper Airway Structure, Function; Preparation of Rat Nasal Airway Casts and Their Application to Studies of Nasal Airflow; Age Related Morphometric Analysis of Human Lung Casts; Anatomical Modeling of Microdosimetry of Inhaled Particles and Gases in the Lung; Experimental Dosimetry; Particle Deposition at the Alveolar Duct Bifurcations; Effects of Airway Branch Angle, Branch Point Number, and Gravity on Particle Deposition and Retention; Regional Deposition of Inhaled Particulates in Conducting Airways and Lung Segments; The Physical Properties of Mainstream Cigarette Smoke and Their Relationship to Deposition in the Respiratory Tract; Localization of 14C Dotriacontane Labeled Cigarette Smoke Particulate in the Dog Lung; Human Lung Clearance Following Bolus Inhalation of Radioaerosols; Effects of Ventilatory Patterns and Pre-existing Disease on Deposition of Inhaled Particles in Animals; Nasopharyngeal Uptake of Ozone in Humans and Animals; New Methods; Regional Dosimetry of Inhaled Particles Using SPECT; Dual Laser Doppler System for Real Time, Simultaneous Characterization of Aerosols by Size and Concentration; Dosimetry of Inhaled Particles by Means of Light Scattering; Modeling Approaches; Issues That Must Be Addressed When Constructing Anatomical Models of the Developing Lung; Significances of the Variability of Tracheobronchial Airway Paths and Their Air Flow Rates to Dosimetry Model Predictions of the Absorption of Gases; Predicting Respiratory Tract Clearance in Man; The Role of Particle Hygroscopicity in Aerosol Therapy and Inhalation Toxicology; Age-Dependent Lung Dosimetry of Radon Progeny; Deposition and Retention Modeling of Inhaled Cadmium in Rat and Human Lung, An Example for Extrapolation of Effects and Risk Estimation.
Author : F. J. Miller
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (35 download)
Download or read book Lower Respiratory Tract Structure of Laboratory Animals and Humans written by F. J. Miller and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309044847
Total Pages : 257 pages
Book Rating : 4.3/5 (9 download)
Download or read book Comparative Dosimetry of Radon in Mines and Homes written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of underground miners have provided a wealth of data about the risk of lung cancer from exposure to radon's progeny elements, but the application of the miner data to the home environment is not straightforward. In Comparative Dosimetry of Radon in Mines and Homes, an expert committee uses a new dosimetric model to extrapolate to the home environment the risk relationships found in the miner studies. Important new scaling factors are developed for applying risk estimates based on miner data to men, women, and children in domestic environments. The book includes discussions of radon dosimetry and the uncertainties concerning other risk factors such as age and smoking habits. The book also contains a thorough technical discussion of the characteristics of radioactive aerosols in domestic environments, the dose of inhaled radon progeny to different age groups, identification of respiratory tract cells at the greatest risk of carcinogenesis, and a complete description of the new lung dose model being developed by the International Commission on Radiological Protection as modified by this committee.
Author : Otto G. Raabe
Publisher : Medical Physics Publishing Corporation
ISBN 13 :
Total Pages : 684 pages
Book Rating : 4.3/5 (91 download)
Download or read book Internal Radiation Dosimetry written by Otto G. Raabe and published by Medical Physics Publishing Corporation. This book was released on 1994 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: Very useful for both beginning students and medical professionals involved with radiation, Internal Radiation Dosimetry is a comprehensive textbook that covers both the fundamental and applied aspects of ionizing radiation dosimetry for radionuclides deposited in the human body. Emphasis is on modern health physics and industrial hygiene standard and practice.
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (16 download)
Download or read book The Revised International Commission on Radiological Protection (ICRP) Dosimetric Model for the Human Respiratory Tract written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A task group has revised the dosimetric model of the respiratory tract used to calculate annual limits on intake of radionuclides. The revised model can be used to project respiratory tract doses for workers and members of the public from airborne radionuclides and to assess past exposures. Doses calculated for specific extrathoracic and thoracic tissues can be adjusted to account for differences in radiosensitivity and summed to yield two values of dose for the respiratory tract that are applicable to the ICRP tissue weighted dosimetry system.
Author : National Council on Radiation Protection and Measurements
Publisher : Ncrp
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.3/5 (91 download)
Download or read book General Concepts for the Dosimetry of Internally Deposited Radionuclides written by National Council on Radiation Protection and Measurements and published by Ncrp. This book was released on 1985 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shaheen Dewji
Publisher : CRC Press
ISBN 13 : 0429621558
Total Pages : 507 pages
Book Rating : 4.4/5 (296 download)
Download or read book Advanced Radiation Protection Dosimetry written by Shaheen Dewji and published by CRC Press. This book was released on 2019-04-02 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although many radiation protection scientists and engineers use dose coefficients, few know the origin of those dose coefficients. This is the first book in over 40 years to address the topic of radiation protection dosimetry in intimate detail. Advanced Radiation Protection Dosimetry covers all methods used in radiation protection dosimetry, including advanced external and internal radiation dosimetry concepts and regulatory applications. This book is an ideal reference for both scientists and practitioners in radiation protection and students in graduate health physics and medical physics courses. Features: A much-needed book filling a gap in the market in a rapidly expanding area Contains the history, evolution, and the most up-to-date computational dosimetry models Authored and edited by internationally recognized authorities and subject area specialists Interrogates both the origins and methodologies of dose coefficient calculation Incorporates the latest international guidance for radiation dosimetry and protection
