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The Llnl Cr 39 Personnel Neutron Dosimeter
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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 Personnel Neutron Dosimetry Using Electrochemically Etched CR-39 Foils by : Dale E. Hankins
Download or read book Personnel Neutron Dosimetry Using Electrochemically Etched CR-39 Foils written by Dale E. Hankins and published by . This book was released on 1989 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Personnel Neutron Dosimetry Using Electrochemically Etched CR-39 Foils by : Dale E. Hankins
Download or read book Personnel Neutron Dosimetry Using Electrochemically Etched CR-39 Foils written by Dale E. Hankins and published by . This book was released on 1987 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Personnel Neutron Dosimetry Using CR-39 Foils by :
Download or read book Personnel Neutron Dosimetry Using CR-39 Foils written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We are using CR-39 foils for personnel nuetron dosimetry at the Lawrence Livermore National Laboratory. We have developed a three-step electrochemical etching procedure that includes low-frequency electrochemical etching at low frequency and at elevated temperatures. Our first etching step is at 60 Hz, 3000 V for 5 hours in a 60°C oven using 6.5 N KOH. The second etching step consists of an additional 23-minute etch at 60°C, 2.0 kHz, and 3000 V, which increases the track size and makes them relatively uniform in size. The final step is a 15-minute post etch at 60°C, which gives the tracks a smoother appearance. The foils are etched in etch chambers that can etch up to 24 foils. Several of these chambers can be used simultaneously with a single power supply. These chambers are rugged and have been used daily for over a year. 8 refs., 6 figs., 1 tab.
Book Synopsis Personnel Neutron Dosimetry Applications of Track-size Distributions on Electrochemically Etched CR-39 Foils by :
Download or read book Personnel Neutron Dosimetry Applications of Track-size Distributions on Electrochemically Etched CR-39 Foils written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The track-size distribution on electrochemically etched CR-39 foils can be used to obtain some limited information on the incident neutron spectra. Track-size distributions on CR-39 foils can also be used to determine if the tracks were caused by neutrons or if they are merely background tracks (which have a significantly different track-size distribution). Identifying and discarding the high-background foils reduces the number of foils that must be etched. This also lowers the detection limit of the dosimetry system. We have developed an image analyzer program that can more efficiently determine the track density and track-size distribution, as well as read the laser-cut identification numbers on each foil. This new image analyzer makes the routine application of track-size distributions on CR-39 foils feasible. 2 refs., 3 figs.
Book Synopsis Personnel Neutron Dosimetry Using Hot, Low-frequency Electrochemical Etching by :
Download or read book Personnel Neutron Dosimetry Using Hot, Low-frequency Electrochemical Etching written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have developed an electrochemical-etch procedure for the processing of large numbers of CR-39 dosimeters. Specially designed Homann-Type chambers can etch up to 24 CR-39 chips, or foils, at one time. In our two-step procedure, the second step, called blow-up, increases the tracks' size and makes them relatively uniform. The energy response is fairly flat from approx. 150 keV to 4.5 MeV, but drops by about a factor of three in the 13 to 16 MeV range. The sensitivity of the dosimetry system is 6 tracks/mrem with a background of 8 mrem, giving a lower limit of sensitivity of approximately 10 mrem for the dosimeter (when three foils are used). Because greater numbers of CR-39 foils can be accommodated at any one time, our procedure is quite efficient for operations with large numbers of dosimeters to be processed. 12 refs., 6 figs., 3 tabs.
Book Synopsis Passive Dosimeters Other Than Film and TLDs (thermoluminescent Dosimeter). by :
Download or read book Passive Dosimeters Other Than Film and TLDs (thermoluminescent Dosimeter). written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This presentation will describe CR-39 plastic as a personnel neutron dosimeter. Recent research at LLNL and elsewhere has resulted in the development of a dosimetry system that is superior to any personnel neutron dosimeter previously available. The author describes the features of the dosimetry system and the new etching procedures and techniques in detail. Most of the research was done at the LLNL and has been supported as a part of the DOE Neutron Dosimetry Upgrade Program. 10 refs., 4 figs., 1 tab.
Book Synopsis Use of CR-39 for Nuclear Criticality Accident Dosimetry and High Neutron Dose Monitoring by : Lydia I. Tai
Download or read book Use of CR-39 for Nuclear Criticality Accident Dosimetry and High Neutron Dose Monitoring written by Lydia I. Tai and published by . This book was released on 2016 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: CR-39 foils were irradiated as part of nuclear accident dosimetry experiments using the Godiva reactor at the Nevada National Security Site and the Caliban and Prospero reactors at the Valduc Centre for Nuclear Studies in France. The irradiated foils were chemically etched using the standard Lawrence Livermore National Laboratory process for personnel neutron dosimeters. Following chemical processing, the optical density of the CR-39 foils was measured using a transmission densitometer and found to be a function of the fast neutron dose as measured by the neutron activation components of the nuclear accident dosimeters. The relationship between fast neutron absorbed dose and optical density exponentially approaches a maximum at an absorbed dose of about 1 Gy. For the chemical etching process used in this study, neutron doses above 1 Gy did not further increase the optical density of the CR-39 foils.
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:
Download or read book Neutron Dosimetry written by and published by . This book was released on 1988 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Dosimetry of Ionizing Radiation by : Bozzano G Luisa
Download or read book The Dosimetry of Ionizing Radiation written by Bozzano G Luisa and published by Elsevier. This book was released on 2012-12-02 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: A continuation of the treatise The Dosimetry of Ionizing Radiation, Volume III builds upon the foundations of Volumes I and II and the tradition of the preceeding treatise Radiation Dosimetry. Volume III contains three comprehensive chapters on the applications of radiation dosimetry in particular research and medical settings, a chapter on unique and useful detectors, and two chapters on Monte Carlo techniques and their applications.
Book Synopsis Personnel Neutron Dosimetry Studies at the Lawrence Livermore National Laboratory by :
Download or read book Personnel Neutron Dosimetry Studies at the Lawrence Livermore National Laboratory written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted to determine the effect of phantom size, shape and composition on the response of an albedo neutron dosimeter. The most important feature was the shape. The dose equivalent rate from a californium neutron source was determined. Ten different dose rates were determined which varied from 2.39 to 3.02 rem/h for the CF source used. (ACR).
Author :United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment Publisher : ISBN 13 : Total Pages :1300 pages Book Rating :4.0/5 ( download)
Book Synopsis External Regulation of DOE Facilities by : United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment
Download or read book External Regulation of DOE Facilities written by United States. Congress. House. Committee on Science. Subcommittee on Energy and Environment and published by . This book was released on 2000 with total page 1300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 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.
Download or read book Neutron Dosimetry written by R. Jahr and published by . This book was released on 1992 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
