Download or read book Neutron Dosimetry Using a Tissue Equivalent Ionization Chamber written by and published by . This book was released on 1980 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: A system for the measurement of neutron tissue does or kerma has been assembled and tested. The dosimeter is a tissue-equivalent ionization chamber, of modified commercial design. It is enclosed in an airtight aluminum shell, which can be filled with tissue-equivalent gas and sealed, thereby eliminating the need for continuous gas flow. Ionization current can be measured using either a commercial electrometer or a DREO-constructed electrometer. The latter instrument enables the readout device to be located far from the dosimeter without an increase in the leakage current. Calibration theory and procedures are described, and correction factors discussed. (Author).
Download or read book Neutron Dosimetry Using a Tissue equivalent Ionization Chamber written by Hirning, Charles Ross and published by Defence Research Establishment Ottawa. This book was released on 1980 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A system for the measurement of neutron tissue does or kerma has been assembled and tested. The dosimeter is a tissue-equivalent ionization chamber, of modified commercial design. It is enclosed in an airtight aluminum shell, which can be filled with tissue-equivalent gas and sealed, thereby eliminating the need for continuous gas flow. Ionization current can be measured using either a commercial electrometer or a DREO-constructed electrometer. The latter instrument enables the readout device to be located far from the dosimeter without an increase in the leakage current. Calibration theory and procedures are described, and correction factors discussed. (Author).
Download or read book Neutron Dosimetry written by John W. Baum and published by . This book was released on 1955 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Neutron Dosimetry Intercomparison Study with Tissue Equivalent Ionization Chambers written by S. Vynckier and published by . This book was released on 1988* with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ion Chambers for Neutron Dosimetry written by J. J. Broerse and published by Routledge. This book was released on 1980 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dosimetry for the Godiva II Critical Assembly written by Joseph A. Sayeg and published by . This book was released on 1959 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radiation Dosimetry Instrumentation and Methods written by Gad Shani and published by CRC Press. This book was released on 1991-07-23 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiation Dosimetry Instrumentation and Methods provides the basic theory and practical methods of radiation dosimetry. The book begins with a review of the theoretical basis of radiation dosimetry and the system of units used in the measurements. The remainder of the book presents dosimetry methods widely used in nuclear medicine, as well as new techniques and methods that are applied only in specific circumstances. The theoretical basis on which each method is based and the practical and technical details of each dosimeter's design and construction are presented. Dosimetry methods are compared and correction factors and adjustments offered in the final chapter. The methods discussed in this fascinating text include ionization chambers, thermoluminescence dosimeters (TLD), photographic emulsion, chemical dosimetry and calorimetry, lyoluminescence dosimetry, solid state detectors, tritium monitoring, and neutron dosimetry. Radiation Dosimetry Instrumentation and Methods is an excellent book for physicians in nuclear medicine, hospital radioisotope departments, radiobiologists, radiochemists, and users of nuclear radiation for scientific, technical and energy production purposes.
Download or read book The Dosimetry of Ionizing Radiation written by Kenneth R. Kase and published by Elsevier. This book was released on 2013-10-22 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Dosimetry of Ionizing Radiation, Volume II, attempts to fill the need for updated reference material on the field of radiation dosimetry. This book presents some broad topics in dosimetry and a variety of radiation dosimetry instrumentation and its application. The book opens with a chapter that extends and applies the concepts of microdosimetry to biological systems. This is followed by separate chapters on the state-of-the-art equipment and techniques used to determine neutron spectra; studies to determine recombination effects in ionization chambers exposed to high-intensity pulsed radiation; advances in water and polystyrene calorimetry; and beta-photon dosimetry for radiation protection. This book is clearly a valuable collection of work by outstanding authorities in their individual fields. It has an international flavor, with authors from England, Canada, and the United States. The quality of the work is equal to the best of what has been published in the past.
Download or read book Neutron gamma Dose Separation by the Multiple Ion Chamber Technique written by Steven J. Goetsch and published by . This book was released on 1983 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings Second Symposium on Neutron Dosimetry in Biology and Medicine written by Symposium on Neutron Dosimetry in Biology and Medicine and published by . This book was released on 1975 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron and Gamma ray Dosimetry in an Animal Exposure Volume at a Pulsed Triga Reactor written by R. E. Simpson and published by . This book was released on 1962 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution of steady-state and pulsed, neutron and gamma-ray dose was measured in an animal exposure volume at the TRIGA reactor. The usable volume was restricted to the lower 20 in. of an aluminum irradiation tube having an ID of 9-1/2 in. The tube was inserted into the pool adjacent to the reactor void tank, 134 cm from the core. Dosimetry films were used to determine gamma-ray dose while Sievert ionization chambers were used to determine neutron dose. Gold foils were used to measure the thermal neutron flux. Neutron doses were referenced to sulphur foil monitors. The neutron spectrum was examined with a system of threshold detectors and compared with spectra from Godiva II and the biological port of the Argonne CP-5 reactor. The vertical variation of dose along a lucite board was measured at the midplane of a lucite canister lowered into the tube. The dose in the lower 16 in. varied less than 5%. The ratio of neutron to gamma dose was approximately 6 to 1. A tissue equivalent dog phantom, 20 in. long and 7-1/2 in. in diameter, was designed to determine the absorbed dose in depth. The fast neutron dose was about equal to the gamma-ray dose at the midline of the phantom. The neutron plus gamma-ray dose at the midline was 44% of the dose at the front surface of the phantom. (Author).
Download or read book Experimental Determination of Fast and Thermal neutron Tissue Dose written by Joseph A. Sayeg and published by . This book was released on 1958 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron and Gamma Dosimetry Measurements at the AFRRI DASA TRIGA Reactor written by and published by . This book was released on 1965 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topics include: fast neutron dosimetry (threshold detectors (Pu239 (surrounded by B10), Np237, U238, and S32), Hurst proportional counter, tissue equivalent and graphite-CO2 ionization chambers); Gamma ray dosimetry (silver phosphate glass rods, graphite-CO2 ionization chamber, tetrachloroethylene chemical dosimeters); thermal neutron dosimetry (bare and cadmium covered gold and indium foils).
Download or read book Revised Neutron Flux Spectrum and Tissue Dose Measurements at the Godiva II Critical Assembly written by Joseph A. Sayeg and published by . This book was released on 1960 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactor Dosimetry with Paired Miniature Ionization Chambers written by D. W. Shosa and published by . This book was released on 1971 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paired ionization chambers with nominal volumes of 0.05 cc are in use at the Armed Forces Radiobiology Research Institute to measure neutron and gamma components of depth doses in steady-state and pulsed TRIGA fields. Cavity chamber theory is employed to obtain quantitative estimates of neutron and gamma dose sensitivities of a chamber with a tissue-equivalent plastic wall filled with a tissue-equivalent gas and magnesium chamber filled with CO2. The uncertainties in these estimates have been propagated through the paired chamber equations and result in the following uncertainties in measured dose components in a field where the neutron to gamma dose ratio varies from 0.1 to 15. (Author).
Download or read book A Pressure Ionization Chamber for the Measurement of Neutron Fluxes at Tolerance Level in Portable Instruments written by Gerhard Dessauer and published by . This book was released on 1948 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The largest daily fast neutron dose considered safe for the human body (tolerance dose) is taken to be 0.01 n units. If this dose is received during an 8 hour working day, The neutron flux has to be such as to provide an average dose rate of 0.01 n units per 8 hours. An instrument of high sensitivity is needed to measure fluxes of such order of magnitude in a reasonably short time and within a reasonably small space. High pressure ionization chambers as well as counters will serve the purpose. Which of the two should be chosen depends on what appears the most satisfactory compromise in fulfilling the following requirements: (1) The instrument should read as nearly proportional as possible to the biological effect, independently of the energy of the fast neutrons. (2) The instrument should have a high neutron to gamma sensitivity ratio, compared with the 100 r Victoreen chamber. (3) The instrument should be of rugged and simple construction and require no accessories that would make the total weight in excess of what is conveniently portable.
Download or read book Paired Ion Chamber Constants for Fission Gamma Neutron Fields written by and published by . This book was released on 1984 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paired ionization chamber constants are calculated for the 50 cc spherical ionization chambers used in dosimetry of the AFRRI TRIGA reactor. The calculations include the most recently available information on energy spectra for neutron and gamma radiation present in AFRRI reactor exposure rooms, as well as for kerma factors and W-values of neutrons. The constant kT, which expresses neutron sensitivity of the 50 cc tissue equivalent (TE) ion chamber filled with TE gas, ranged from 0.92 to 0.96 among the 18 different neutron spectra for which calculations were done. The constant kU, which expresses neutron sensitivity of the 50 cc graphite ion chamber filled with CO2, ranged from 0.07 to 0.11 among the same spectra. The constant hT, which expresses gamma sensitivity of the TE/TE ion chamber, was taken to be unity for all spectra. The constant hU, which expresses gamma sensitivity of the C/CO2 ion chamber, was 0. 99 + or - 0.01(range) for all spectra. These calculations will serve as the basis for future dosimetry with the 50 cc ion chambers at the AFRRI TRIGA reactor.
