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Author : J.A. Douglas
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (898 download)
Download or read book A Comparison of TL Albedo Neutron Dosimeters written by J.A. Douglas and published by . This book was released on 1976 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. A. Douglas
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (81 download)
Download or read book A Comparison of TL Albedo Dosimeters written by J. A. Douglas and published by . This book was released on 1976 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron Dosimetry Studies at the Lawrence Livermore Laboratory written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Work performed since the last Workshop meeting is summarized. The studies have been divided into the following sections: (1) response of albedo neutron dosimeters to low energy neutrons; (2) discussion of dose-equivalent conversion factors; (3) modification of the A-B remmeter; (4) the effect of distance from the body on the response of albedo neutron dosimeters; (5) comparison of albedo neutron dosimeter techniques; and (6) modified NAD badge for additional beta shielding and albedo neutron dosimetry.
Author : Dale E. Hankins
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.3/5 (91 download)
Download or read book Energy Dependence of Albedo Neutron Dosimeters Placed on the Head written by Dale E. Hankins and published by . This book was released on 1970 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dale E. Hankins
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Small, Inexpensive Albedo-neutron Dosimeter written by Dale E. Hankins and published by . This book was released on 1973 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (683 download)
Download or read book Operational Comparison of Bubble (super Heated Drop) Dosimetry with Routine Albedo TLD for a Selected Group of Pu-238 Workers at Los Alamos National Laboratory written by and published by . This book was released on 1998 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Personnel neutron dosimetry continues to be a difficult science due to the lack of availability of robust passive dosimeters that exhibit tissue- or near-tissue- equivalent response. This paper is an operational study that compares the use of albedo thermoluminescent dosimeters with bubble dosimeters to determine whether bubble dosimeters do provide a useful daily ALARA tool that can yield measurements close to the dose-of-record. A group of workers at Los Alamos National Laboratory (LANL) working on the Radioisotopic Thermoelectric Generators (RTG) for the NASA Cassini space mission wore both bubble dosimeters and albedo dosimeters over a period from 1993 through 1996. The personal albedo dosimeter was processed on a monthly basis and used as the dose-of-record. The results of this study indicated that cumulative daily bubble dosimetry results agreed with whole-body albedo dosimetry results within about 37% on average.
Download or read book Neutron Response of a New Albedo-neutron Dosimeter written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Los Alamos Scientific Laboratory is converting from a film badge to a badge containing thermoluminescent dosimeters (TLD's). The new dosimeter consists of a plastic badge holding an aluminum card which contains three TLD-700 and one TLD-600 Harshaw LiF chips. In the albedo-neutron portion of the badge, based on Hankins' design, the TLD-600 and one TLD-700 chips are shielded from thermal neutrons by 0.026-inch-thick cadmium. From the difference in readings of these two TLD's, the neutron dose is estimated. There is also a detachable holder for NTA film if needed to cover the neutron energy range not covered by the albedo-neutron badge. The neutron energy response of the new badge was measured, using monoenergetic sources over the range from 0.1 to 14 MeV and is compared with a calculated response over this range. Since NTA film cannot detect proton recoils from neutrons with energies less than 0.7 MeV, a primary advantage of the TLD albedo-neutron badge is its ability to record neutrons down to the cadmium cutoff. However, a major disadvantage is its sharp decrease in sensitivity with increasing energy. Data are given showing this. Using a BF3 detector inside 9-inch and 3-inch polyethylene spheres containing cadmium, Hankins developed a method for applying energy calibration factors to the albedo-neutron TLD badge readings. This method is based on two premises: first, that the response in rem of the 9-inch sphere is independent of energy and second, that the response of the 3-inch sphere is similar to that of the TLD albedo-neutron badge. Measurements to test the validity of these premises are reported. The method requires initial 9-inch to 3-inch sphere ratios to be measured in each area where neutrons are encountered and periodic checks to detect changes which may occur.
Author : Dale E. Hankins
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.3/5 (91 download)
Download or read book Factors Affecting the Design of Albedo Neutron Dosimeters Containing Lithium Fluoride Thermoluminescent Dosimeters written by Dale E. Hankins and published by . This book was released on 1972 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Albedo Neutron Dosimeters written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The design, operation, calibration, and performance of albedo neutron dosimeters are discussed. An albedo neutron dosimeter is designed to measure the flux of thermal neutrons which leave the body when a person is exposed to fast energy neutrons. The fast neutrons are scattered and moderated in the body, and many have lost most of their initial energy and emerge as thermal neutrons. The albedo neutron dosimeter is designed to detect this flux of thermal neutrons by using a thermal neutron detector. This could be any type of thermal neutron detector but in practical applications lithium fluoride (LiF) thermoluminescence dosimeters (TLDs) are most frequently used. Various types of albedo neutron dosimeters are described. (WHK).
Author : Betty Ann Torres
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (355 download)
Download or read book Angular Dependence of Dose Equivalent Response of an Albedo Neutron Dosimeter written by Betty Ann Torres and published by . This book was released on 1994 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Technique to Improve the Accuracy of Albedo Neutron Dosimeter Evaluations written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The calibration factor for albedo neutron dosimeters varies greatly depending upon the energy of the neutrons in the exposure. Calibration results obtained over an eight-year period at each Lawrence Livermore National Laboratory facility where neutron exposure may occur were reviewed. A stronger relationship than expected was found between the ratio of the readings of the 9-in. to 3-in. spheres and the percent thermal. Readings from personnel and albedo badges were reviewed. The readings were consistent with the use of a calibration factor for the albedo dosimeter which varies with changes in the ratio of the personnel and albedo dosimeter TLD readings. 2 references, 6 figures. (ACR).
Download or read book Albedo-neutron Dosimetry Studies at Lawrence Livermore Laboratory written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarized studies performed since the last workshop meeting. The studies have been divided into four sections: (1) the relative response of Hankins-type albedo-neutron dosimeters made of cadmium and boron; (2) the effect of distance from the body on the response of albedo-neutron dosimeters; (3) the use of the ratio of the top to bottom TLDs to determine the calibration factor for albedo-neutron dosimeters; and (4) neutron survey at a power reactor and at a neutron radiography facility.
Download or read book Effect of Energy Dependence on the Evaluations of Albedo Neutron Dosimeters written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Albedo neutron dosimeters have proven to be effective as a method of measuring the dose from low-energy neutrons that other types of personnel neutron dosimeters do not detect. Many albedo neutron dosimeters have been designed, and some are being used extensively. All albedo neutron dosimeters are energy- dependent, becoming less sensitive as the energy of the neutrons is increased. In this paper the energy dependence and the effect it has on the evaluation of the dose are discussed. Numerous measurements are shown which were made under field conditions at five reactors, two accelerators, a radiochemistry facility, two plutonium facilities, a low-scatter neutron irradiation facility, three storage vaults, and at the N.B.S. low-energy neutron beams. These measurements show the limits imposed by the energy dependence on the evaluation of the dose determined by albedo neutron dosimeters. In most cases evaluation of an individual's dose occurring in a single facility can be reasonably accurate, but it must be known in which facility the person was exposed. Procedures using the incident thermal neutron response of TLDs located on top of the dosimeter to correct for the energy dependence are discussed; and errors caused by wearing a dosimeter improperly are evaluated. (auth).
Author :
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (227 download)
Download or read book Correcting the Response of an Albedo Neutron Dosimeter for Energy written by and published by . This book was released on 2007 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron response of an albedo neutron dosimeter varies greatly with energy. For example, the dosimeter, calibrated with moderated Californium fission neutrons, will read more than 30 times the dose from thermal neutrons and less than 3% of the dose from 14 MeV neutrons. To report a correct result, the measured dose equivalent is multiplied by a neutron energy correction factor (NECF). Two techniques for finding the NECF were developed through a cooperative effort among the Naval Research Laboratory, the Naval Surface Warfare Center, and the Naval Dosimetry Center. Data for the DT-702 (measured in 5 different neutron spectra) matched data for the DT-648 dosimeter from 15 spectra that included an SSBN and the NATO standard battlefield spectrum. NECFs calculated from count rate ratios of the AN/PDR-70 neutron remmeter (rem) to its internal parts (guts) or from the ratio of the inner to the outer neutron dosimeters in the DETECTOR RADIAC SS-20/S (NAM-5) make the DT-702 dosimeter about as accurate as the AN/PDR-70 neutron remmeter.
Author : Charles Daniel Henry
Publisher :
ISBN 13 :
Total Pages : 220 pages
Book Rating : 4.:/5 (221 download)
Download or read book Investigation and Comparison of Various Methods of Fast Neutron Dosimetry written by Charles Daniel Henry and published by . This book was released on 1969 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nancy Ellen Rothermich
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (77 download)
Download or read book A Calibration System for Albedo Neutron Dosimeters written by Nancy Ellen Rothermich and published by . This book was released on 1981 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mohamed S. Salem
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (15 download)
Download or read book Thermoluminescence Albedo Neutron Dosimetry written by Mohamed S. Salem and published by . This book was released on 1983 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
