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Development Of A Personnel Neutron Dosimeter
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Book Synopsis Development of a Personnel Neutron Dosimeter by :
Download or read book Development of a Personnel Neutron Dosimeter written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A few inexpensive plastic track etch component, CR-39, polycarbonate, and LR-115 have been added to the albedo dosimeters. This will extend personnel neutron measurement capability, providing information to infer a four energy group spectrum, reduce the expected error in personnel dose assessment, and help clarify the ambiguity that results when personnel must work in more than one neutron facility during the monitoring period. (FS).
Book Synopsis The Development of an Energy Independent Personnel Neutron Dosimeter Using CR-39 by : Steven William Doremus
Download or read book The Development of an Energy Independent Personnel Neutron Dosimeter Using CR-39 written by Steven William Doremus and published by . This book was released on 1989 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The LLNL CR-39 Personnel Neutron Dosimeter by :
Download or read book The LLNL CR-39 Personnel Neutron Dosimeter written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We developed a personnel neutron dosimetry system based on the electrochemical etching of CR-39 plastic at elevated temperatures. The doses obtained using this dosimeter system are more accurate than those obtained using other dosimetry systems, especially when varied neutron spectra are encountered. This CR-39 dosimetry system does not have the severe energy dependence that exists with albedo neutron dosimeters or the fading and reading problems encountered with NTA film. 3 refs., 4 figs.
Book Synopsis The Development of a Dose-equivalent Personnel Fast-neutron Dosimeter Using CR39 by :
Download or read book The Development of a Dose-equivalent Personnel Fast-neutron Dosimeter Using CR39 written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis The Development, Characterization, and Performance Evaluation of a New Combination Type Personnel Neutron Dosimeter by : Chwei-jeng Liu
Download or read book The Development, Characterization, and Performance Evaluation of a New Combination Type Personnel Neutron Dosimeter written by Chwei-jeng Liu and published by . This book was released on 1989 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of an Operational Multicomponent Personnel Neutron Dosimeter by :
Download or read book Development of an Operational Multicomponent Personnel Neutron Dosimeter written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A multicomponent dosimeter has been developed that uses an albedo detector to provide the measurement of low energy neutrons and as a screening element. It also contains track detector components, CR-39 and polycarbonate, which are only processed if the TLD indicates there has been an exposure to neutrons. Since the three components have significantly different energy responses, the dosimeter can act as a crude spectrometer. This report describes the dosimeter and briefly summarizes its use experience. 10 refs., 2 figs., 2 tabs.
Book Synopsis Developments in Solid State Detectors for Personnel Neutron Dosimetry by :
Download or read book Developments in Solid State Detectors for Personnel Neutron Dosimetry written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The personnel neutron exposure potential at the Lawrence Livermore National Laboratory is more diverse than at many other facilities, due to the wide range of neutron producing activities. Albedo energy response problems in the face of the diversity of sources, and a concern about possible photon interferences with the neutron albedo response, have prompted development of some additional dosimetry techniques to augment the personnel monitoring program. This work now consists of two programs - the dosimeter/spectrometer (DOSPEC) in which track etch detectors are added to the albedo badge to provide some energy evaluation and gamma insensitivity, and development of solid state thin film MOS detectors to provide a real time, gamma insensitive dosimeter.
Book Synopsis SUMMARIES OF REPORTS PRESENTED AT THE 5TH PERSONNEL NEUTRON DOSIMETRY WORKSHOP- ERDA- ENERGY RESEARCH AND DEVELOPMENT ADMINISTRATION. by :
Download or read book SUMMARIES OF REPORTS PRESENTED AT THE 5TH PERSONNEL NEUTRON DOSIMETRY WORKSHOP- ERDA- ENERGY RESEARCH AND DEVELOPMENT ADMINISTRATION. written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Eleventh DOE Workshop on Personnel Neutron Dosimetry by :
Download or read book Eleventh DOE Workshop on Personnel Neutron Dosimetry written by and published by . This book was released on 1991 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its formation, the Office of Health (EH-40) has stressed the importance of the exchange of information related to and improvements in neutron dosimetry. This Workshop was the eleventh in the series sponsored by the Department of Energy (DOE). It provided a forum for operational personnel at DOE facilities to discuss current issues related to neutron dosimetry and for leading investigators in the field to discuss promising approaches for future research. A total of 26 papers were presented including the keynote address by Dr. Warren K. Sinclair, who spoke on, ''The 1990 Recommendations of the ICRP and their Biological Background.'' The first several papers discussed difficulties in measuring neutrons of different energies and ways of compensating or deriving correction factors at individual facilities. Presentations were also given by the US Navy and Air Force. Current research in neutron dosimeter development was the subject of the largest number of papers. These included a number on the development of neutron spectrometers. Selected papers were processed separately for inclusion in the Energy Science and Technology Database.
Book Synopsis Composite Damage Track-albedo Personnel Neutron Dosimeter for General Use by :
Download or read book Composite Damage Track-albedo Personnel Neutron Dosimeter for General Use written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: No known detector or series of detectors in personnel neutron dosimeters have correct dose equivalent energy-dependence. Useful dosimeter performance is assumed by calibrating dosimeters for the exposure spectrum. This method implies that the exposure spectrum will be constant within a given facility or the wearer will not be exposed to different spectra in other areas. Since exposure spectra are known to vary widely a composite damage track-albedo personnel neutron dosimeter was developed to separately respond to the softer and more energetic parts of various spectra. The relationships of the responses of the elements vary with different spectra and are used to convert dosimeter readings to dose equivalent. Measurements indicate that dose equivalent deviation was less than approximately 50 percent for unshielded lucite and steel shielded HPRR spectra, monoenergetic spectra from 4.7 to 15 MeV, a 252Cf spontaneous neutron spectrum and an AmBe spectrum. Dosimeter sensitivity was similar to present NTA film methods. The composite personnel neutron dosimeter was also tested with calculated spectra by simulating badge response through known energy-dependence of the badge elements. Dose equivalent deviation was less than approximately 20 percent for 19 significantly different assumed spectra. Thus, the experimental and calculational results support adherence to the dose equivalent for common exposure spectra. (auth).
Book Synopsis Personnel Neutron Dosimetry Area Monitoring Using Solid-State Track Recorders by : FH. Ruddy
Download or read book Personnel Neutron Dosimetry Area Monitoring Using Solid-State Track Recorders written by FH. Ruddy and published by . This book was released on 1989 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Personnel neutron dosimeters using a number of different techniques have been developed for routine use in neutron fields, but all of these dosimeters must be carefully corrected to account for the fact that their response is critically dependent upon the energy distribution of the neutron field. At present, personnel neutron dosimeters are typically calibrated in a standard neutron field (e.g., 252Cf or D2O-moderated 252Cf)- but may then be applied in neutron fields that vary considerably from the calibration field. Some widely used personnel dosimeters, such as TLD-albedo dosimeters, overrespond to low energy neutrons and therefore deliver high readings in fields that are more moderated than the standard field.
Book Synopsis Retrospective Assessment of Personnel Neutron Dosimetry for Workers at the Hanford Site by :
Download or read book Retrospective Assessment of Personnel Neutron Dosimetry for Workers at the Hanford Site written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report was prepared to examine the specific issue of the potential for unrecorded neutron dose for Hanford workers, particularly in comparison with the recorded whole body (neutron plus photon) dose. During the past several years, historical personnel dosimetry practices at Hanford have been documented in several technical reports. This documentation provides a detailed history of the technology, radiation fields, and administrative practices used to measure and record dose for Hanford workers. Importantly, documentation has been prepared by personnel whose collective experience spans nearly the entire history of Hanford operations beginning in the mid-1940s. Evaluations of selected Hanford radiation dose records have been conducted along with statistical profiles of the recorded dose data. The history of Hanford personnel dosimetry is complex, spanning substantial evolution in radiation protection technology, concepts, and standards. Epidemiologic assessments of Hanford worker mortality and radiation dose data were initiated in the early 1960s. In recent years, Hanford data have been included in combined analyses of worker cohorts from several Department of Energy (DOE) sites and from several countries through the International Agency for Research on Cancer (IARC). Hanford data have also been included in the DOE Comprehensive Epidemiologic Data Resource (CEDR). In the analysis of Hanford, and other site data, the question of comparability of recorded dose through time and across the respective sites has arisen. DOE formed a dosimetry working group composed of dosimetrists and epidemiologists to evaluate data and documentation requirements of CEDR. This working group included in its recommendations the high priority for documentation of site-specific radiation dosimetry practices used to measure and record worker dose by the respective DOE sites.
Book Synopsis Development of a Fast Neutron Dosimeter Using the Solid State Nuclear Track Detector CR-39 by : William Alan Poluha
Download or read book Development of a Fast Neutron Dosimeter Using the Solid State Nuclear Track Detector CR-39 written by William Alan Poluha and published by . This book was released on 1986 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Systematic Approach to Personnel Neutron Monitoring by :
Download or read book Systematic Approach to Personnel Neutron Monitoring written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: NTA film and albedo detectors represent the major portion of personnel dosimeters now used for occupational neutron monitoring. However, recent attention to the spectral response of these systems has demonstrated the need for detectors that have a better match to the fields being monitored. Recent developments in direct recoil track etch dosimeters present some intriguing alternatives, and careful use of 237Np fission fragment detectors offers the advantage of a good dose equivalent spectral match. Work continues on a number of other new detector mechanisms, but problems with sensitivity, energy response, gamma interference, etc., continue to prevent development of most mechanisms into viable personnel dosimeters. Current dosimeter limitations make a systematic approach to personnel neutron monitoring particularly important. Techniques have been developed and tested, using available portable survey instruments, that significantly improve the quality of dosimeter interpretation. Even simple spectrometry can be done with modest effort, significantly improving the health physicists ability to provide accurate neutron monitoring.
Book Synopsis Resonance-threshold Foil Neutron Personnel Dosimeter by : Joseph James Fitzgerald
Download or read book Resonance-threshold Foil Neutron Personnel Dosimeter written by Joseph James Fitzgerald and published by . This book was released on 1956 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improving Neutron Dosimetry Using Bubble Detector Technology by :
Download or read book Improving Neutron Dosimetry Using Bubble Detector Technology written by and published by . This book was released on 1993 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing accurate neutron dosimetry for a variety of neutron energy spectra is a formidable task for any dosimetry system. Unless something is known about the neutron spectrum prior to processing the dosimeter, the calculated dose may vary greatly from that actually encountered; that is until now. The entrance of bubble detector technology into the field of neutron dosimetry has eliminated the necessity of having an a priori knowledge of the neutron energy spectra. Recently, a new approach in measuring personnel neutron dose equivalent was developed at Oak Ridge National Laboratory. By using bubble detectors in combination with current thermoluminescent dosimeters (TLDs) as a Combination Personnel Neutron Dosimeter (CPND), not only is it possible to provide accurate dose equivalent results, but a simple four-interval neutron energy spectrum is obtained as well. The components of the CPND are a Harshaw albedo TLD and two bubble detectors with theoretical energy thresholds of 100 key and 1500 keV. Presented are (1) a synoptic history surrounding emergence of bubble detector technology, (2) a brief overview of the current theory on mechanisms of interaction, (3) the data and analysis process involved in refining the response functions, (4) performance evaluation of the original CPND and a reevaluation of the same data under the modified method, (5) the procedure used to determine the reference values of component fluence and dose equivalent for field assessment, (6) analysis of the after-modification results, (7) a critique of some currently held assumptions, offering some alternative explanations, and (8) thoughts concerning potential applications and directions for future research.
