15 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Gamma Detection"  
Results: 1 - 15
open access

Determination of light elements in amalgam restorations. [Dental amalgam]

Description: Rutherford backscattering has been used to measure the major elemental compositions in the near-surface regions of freshly prepared and used samples of dental amalgam. A depletion from bulk stoichiometry of the major elements, which indicates an accumulation of lighter elements on the surface of the materials, has been observed. Increases in the F, Na, Cl, P, O, C, and N concentrations between freshly prepared samples and used samples were measured by observation of gamma rays produced by proto… more
Date: January 1, 1982
Creator: Hanson, A. L.; Jones, K. W.; Kraner, H. W.; Osborne, J. W. & Nelson, G. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theoretical characterization of a dual-purpose gamma thermometer for local power-generation measurement in an LMFBR

Description: A preliminary analytical and computational study was performed to investigate the potential of a modified gamma thermometer (GT) as both a local power level monitor and a sodium flow blockage monitor for a Liquid Metal Fast Breeder Reactor. This study consisted of two fundamental parts: a radiation field characterization and a thermal-hydraulic analysis. The radiation transport analysis was performed to determine the volumetric heat source within the GT resulting from gamma and neutron heating.… more
Date: April 1, 1982
Creator: Johnson, J. O. & Burns, T. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cerenkov radiators for photodiodes

Description: Several materials have been examined for use as Cerenkov converters in front of photodiodes in an effort to find a gamma detector system that has more sensitivity than a Compton detector but makes little sacrifice in bandwidth. Suprasil (fused silica) and UVT Lucite (acrylic) were 10-100 times more sensitive than a Compton detector and provided almost the same bandwidth. Barium fluoride provided almost 1000 times the sensitivity, but with a factor of 3 or 4 reduction in bandwidth. Relative sens… more
Date: January 1, 1982
Creator: Toevs, J. W.; Young, C. S.; Zagarino, P. A. & Seno, R. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Finding and evaluating potential radiological problems in the vicinity of uranium milling sites

Description: Tailings at inactive milling sites usually have a low frequency of human occupancy but continuously generate /sup 222/Rn into the atmosphere. Measurements of airborne /sup 222/Rn and /sup 222/Rn flux are made on the sites to define the tailings source term. Concurrently with these measurements, an ambient /sup 222/Rn monitoring network is established off-site and a meteolrololgical station is established at or near the mill site. Radioactivity can migrate to areas outside of site boundaries by … more
Date: January 1, 1982
Creator: Goldsmith, W.A. & Yates, W.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Health physics instruments: what are the current needs

Description: Health Physics instruments are used to measure the risk which may be incurred by an individual exposed to a given radiation field. The response of the instrument sensors will differ markedly from actual human risk factors for a variety of reasons, and this requires the use of instrument modifications and conversion factors. The values of these conversion factors continue to be updated and will likely change in the future. To accommodate the effects of different types of radiation and new conver… more
Date: January 1, 1982
Creator: Armantrout, G. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modular gamma systems

Description: Nuclear safeguards requires sensitive, easily operated instruments for rapid inspection of personnel and vehicles to ensure that no uranium or plutonium is being diverted. Two portable gamma-ray detection systems have been developed. The Modular Gamma System (MGS) is very sensitive and two or more systems can be connected for even better performance. The multiunit configuration can be deployed by motor vehicle for search of large areas too extensive to search on foot. The Programmable Rate Moni… more
Date: January 1, 1982
Creator: Millegan, D. R. & Nixon, K. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nondestructive verification with minimal movement of irradiated light-water-reactor fuel assemblies

Description: Nondestructive verification of irradiated light-water reactor fuel assemblies can be performed rapidly and precisely by measuring their gross gamma-ray and neutron signatures. A portable system measured fuel assemblies with exposures ranging from 18.4 to 40.6 GWd/tU and with cooling times ranging from 1575 to 2638 days. Differences in the measured results for side or corner measurements are discussed. 25 figures, 20 tables.
Date: October 1, 1982
Creator: Phillips, J. R.; Bosler, G. E.; Halbig, J. K.; Klosterbuer, S. F. & Menlove, H. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New generation of radiacs: small computerized multipurpose radiation monitors

Description: The Health Division at Los Alamos has developed a multipurpose radiation monitoring device that is computer-controlled, light weight (3 lb), includes multiple radiation detectors running simultaneously, and is simple to use. This multipurpose radiac is generic in nature and can use any of the standard radiation detectors such as NaI, /sup 3/He, LET proportional gas counters, solid state surface barrier detectors, etc. LCD displays indicate the various radiation parameters in both alphanumeric a… more
Date: January 1, 1982
Creator: Umbarger, C. J.; Bjarke, G. O.; Erkkila, B. H.; Trujillo, F.; Waechter, D. A. & Wolf, M. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Operation of cover-gas system during SLSF tests. [LMFBR]

Description: During two tests in the Sodium Loop Safety Facility (W1 and P4), high resolution gamma-ray spectroscopy was used to detect pin failure by observing radioactive fission product isotopes of Kr and Xe from exposed fuel. A continuous stream of argon cover gas from the in-pile loop was transferred to a shielded sample volume. Two germanium crystal spectrometers continuously recorded spectra of gamma rays in the energy range 80 keV to approx. 2.7 MeV. A very wide range of signal strength was accommod… more
Date: January 1, 1982
Creator: Braid, T. H.; Harper, H. A. & Wilson, R. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gamma monitor for assay of radioactive solid-waste shipments

Description: A gamma waste monitor has been developed and evaluated at the Savannah River Plant (SRP). The purpose of the monitor is to improve estimates of the radionuclides in solid wastes arriving at the plant's burial ground. This monitor, a computer-based spectrometer, quantitatively measures many radionuclides in SRP waste, including waste in heavily shielded shipping casks. Radionuclides emitting gamma rays of sufficient energy to penetrate the shipping container walls can be measured directly. … more
Date: June 1, 1982
Creator: Crawford, J H
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

X-ray transients as seen by Vela, 1969-1979

Description: Vela spacecraft 5A and 5B were launched into orbit in May 1969, to monitor for nuclear tests in space. These spacecraft were among the first to be capable of x-ray astronomy. One of these, Vela 5B, monitored the entire x-ray sky for the unprecedented period of 10 years, from May 1969 to June 1979. Over the last several years the data produced have been re-analyzed to produce a series of skymaps. These have now been made into a movie, in color, showing the changes in the x-ray sky over the perio… more
Date: January 1, 1982
Creator: Terrell, J.; Priedhorsky, W. C.; Belian, R. D.; Conner, J. P. & Evans, W. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Comparison of measured and calculated radiation doses in granite around emplacement holes in the spent-fuel test: Climax, Nevada Test Site

Description: Lawrence Livermore National Laboratory (LLNL) has emplaced eleven spent nuclear-reactor fuel assemblies in the Climax granite at the Nevada Test Site as part of the DOE Nevada Nuclear-Waste Storage Investigations. One of our objectives is to study radiation effects on the rock. The neutron and gamma-ray doses to the rock have been determined by MORSE-L Monte Carlo calculations and measurements using optical absorption and thermoluminescence dosimeters and metal foils. We compare the results to … more
Date: October 11, 1982
Creator: van Konynenburg, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nondestructive Assay of Uranium Enrichment with Gamma Rays

Description: An instrument has been developed and tested for nondestructive assay of 235U enrichment of uranium oxide powder contained in sealed 1-gallon cans. A theoretical correlation of enrichment vs. count rate agrees well with the calibration measurements and provides guidelines for applicability. A microcomputer simplifies operator requirements and provides on-line enrichment results.
Date: November 23, 1982
Creator: Winn, Willard G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Test and evaluation of the in-line plutonium solution K-absorption-edge densitometer at the Savannah River Plant. Phase I. Off-line testing results

Description: An in-line, plutonium-solution, K-edge absorption densitometer has been developed at Los Alamos and is currently undergoing test and evaluation at the Savannah River Plant (SRP). The first phase of the test and evaluation (off-line instrument calibration and solution assays) was completed, and preparations are under way to install the instrument in-line, as soon as process schedules permit. Calibration data in the design concentration range of 25 to 40 g Pu/L demonstrate routine achievement of … more
Date: April 1, 1982
Creator: Smith, H. A., Jr.; Marks, T. & Johnson, S. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen