| Early Detection of Breast Cancer via Multiplane Correlation Breast Imaging |
01 APR 2007 |
42 pages |
| Authors:
Anuj J. Kapadia; DUKE UNIV DURHAM NC
|
 | We are developing a tomographic technique called Neutron Stimulated Emission Computed Tomography (NSECT) for early detection of breast cancer. NSECT is sensitive to metabolic changes in trace element concentrations that are seen in tumors at very early stages of development. Detecting and measuring these element concentrations has the potential to detect breast cancer early. Using neutrons as the imaging radiation leads to significant concerns about patient dose. While preliminary experiments ... |
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| ABERDEEN MAGNETICS FIELD TEST, |
FEB 2002 |
|
| Authors:
G. A. FISCHER; J. E. FINE; A. S. EDELSTEIN; ARMY RESEARCH LAB ADELPHI MD
|
 | (U) THIS PAPER DISCUSSES MAGNETIC SENSOR TESTS AT THE ABERDEEN PROVING GROUND WITH A FLUXGATE MAGNETOMETER TO OBTAIN BASELINE REQUIREMENTS FOR MAGNETIC SENSORS FOR US ARMY APPLICATIONS. TESTS WERE CONDUCTED ON MOVING AND STATIONARY TANKS, AS WELL AS ON SOLDIRES CARRYING RIFLES. THE RESULTS DEMONSTRATE THAT A MOVING TANK AT 160 FT AND A MOVING SOLDIER AT 20 FT FROM THE MAGNETOMETER COULD BE DETECTED. THE RESULTS ALSO SHOW THAT ... |
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| 3-D CHARACTERIZATION OF SEISMIC PROPERTIES AT THE SMART WEAPONS TEST RANGE, YPG, |
FEB 2002 |
|
| Authors:
RICHARD D. MILLER; Thomas S. Anderson; JONN C. DAVIS; DON W. STEEPLES; MARK L. MORAN; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
|
| (U) THIS PAPER PRESENTS RESULTS FOR AN EXTENSIVE HIGH RESOLUTION GEOPHYSICAL CHARACTERIZATION STUDY AT THE SMART WEAPONS TEST RANGE SITE ALONG WITH VALIDATION USING 3-D MODELING. IN THE STUDY SEVERAL SHALLOW SEISMIC METHODS AND PROCESSING TECHNIQUES WERE USED TO GENERATE A 3-D GRID OF EARTH SEISMIC PROPERTIES, INCLUDING COMPRESSIONAL AND SHEAR BODY WAVE SPEEDS AND THEIR ASSOCIATED BODY WAVE ATTENUATION PARAMETERS. THE REPORT SHOWS RESULTS OF DETAILED CHARACTERIXATIONS OF GEOPHYSICAL ... |
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| A MINIATURE ACOUSTIC SENSOR THAT MIMICS MAMMALIAN SOUND PROCESSING, |
FEB 2002 |
|
| Authors:
ALLYN HUBBARD; TOM BIFANO; JIHAD BOURA; FANGYI CHEN; ANDREW CHERRY; HOWARD COHEN; SOCRATES DELIGEORGES; CHRISTOPHER KAPUSTA; CHRISTIAN KARL; BOSTON UNIV MA COLL OF ENGINEERING
|
| (U) THIS PAPER PRESENTS THE DEVELOPMENT OF A MINIATURE ACOUSTIC SENSOR THAT CONTAINS MECHANICAL AND ELECTRICAL COUNTERPARTS TO THE AUDITORY PROCESSING SUBSYSTEMS USED BY MAMMALS. THE COCHLEA LIKE FRONT END OF THE DEVICE IS DESIGNED USING A RIBBED STRUCTURE COMPOSED OF POLYMER GROUND STRUCTURES BUILT UP WITH METAL COMPRISING COUPLED RESONATORS. A SCHEMATIC OF THE DEVICE IS SHOWN IN THE PAPER DEMONSTRATING AN ONGOING PROJECT SHOWING ALSO RESULTS AT A ... |
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| Positive Anisotropic Group Scattering Cross Sections for Radiation Transport |
MAY 1999 |
207 pages |
| Authors:
J. M. DelGrande; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| In solving the Boltzmann transport equation, most discrete ordinates codes calculate the source term by first approximating the scattering cross section using a Legendre polynomial expansion. Such expansions are insufficient when scattering is anisotropic and the Legendre expansion is truncated prematurely. This can lead to nonphysical negative cross sections, negative source terms and negative angular fluxes. While negative sources are problematic for standard discrete ordinates methods leading to poor convergence ... |
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| Back to the Future: The Historical, Scientific, Naval, and Environmental Case for Fission Fusion |
02 APR 1998 |
28 pages |
| Authors:
Wallace M. Manheimer; NAVAL RESEARCH LAB WASHINGTON DC FUNDAMENTAL PLASMA PROCESSES
|
| It is proposed that a return to fission fusion, and especially the development of the thorium cycle could be a means to revitalize magnetic fusion research. This work analyzes recent history, attempts to find the reason magnetic fusion research is in the shape it is in, and argues that an embrace of the hybrid could improve its prospects. Then it analyzes recent Tokamak results, concluding that a research Tokamak reactor, ... |
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| Reduced Computational Cost, Totally Symmetric Angular Quadrature Sets for Discrete Ordinates Radiation Transport |
DEC 1997 |
148 pages |
| Authors:
Joseph M. Oder; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| Several new quadrature sets for use in the discrete ordinates method of solving the Boltzmann neutral particle transport equation are derived. These symmetric quadratures extend the traditional symmetric quadratures by allowing ordinates perpendicular to one or two of the coordinate axes. Comparable accuracy with fewer required ordinates is obtained. Quadratures up to seventh order are presented. The validity and efficiency of the quadratures is then tested and compared with the ... |
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| Neutron and Electromagnetic Emissions During the 1990 May 24 Solar Flare |
13 DEC 96 |
22 pages |
| Authors:
L. G. Kocharov; Jeongwoo W. Lee; H. Zirin; G. A. Kovaltsov; I. G. Usoskin; PHILLIPS LAB HANSCOM AFB MA
|
| In this paper, we are primarily concerned with the solar neutron emission during the 1990 May 24 flare, utilizing the counting rate of the climax neutron monitor and the time profiles of hard X-rays and gamma-rays obtained with the GRANAT satellite (Pelaez et al., 1992: Talon et al., 1993: Terekhov et al., 1993). We compare the derived neutron injection function with macroscopic parameters of the flare region as obtained from ... |
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| Detection of Subsurface Fissionable Nuclear Contamination Through the Application of Photonuclear Techniques. |
27 FEB 1996 |
|
| Authors:
Gary F. Mastny; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A photoneutron detection apparatus comprises an X ray generator and a neutron detector adapted for placement in proximity to subsurface soil. The X ray generator produces timed pulses of X ray photons having a range of electronically controlled energies which penetrate the subsurface soil to produce photoneutron emissions that are received by the neutron detector. The neutron detector generates a signal representative of the neutron flux. A signal analysis system ... |
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| Experimental Evaluation of an Instrumented Synthesis Method for the Real-Time Estimation of Reactivity |
JUN 93 |
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| Authors:
Lorin C. Selby; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| This research is part of an investigation into the feasibility of using reactor-generated signals in an instrumented synthesis method for the real-time estimation, of reactivity. The method utilizes in-core neutron detectors to evaluate local core power distributions for eventual use in an on- line controller. Although numerical evaluation of the synthesis method has proven successful, this experimental work was conducted to determine if the signals provided by actual in-core sensors ... |
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| A High Efficiency Fast Neutron Detector |
02 AUG 89 |
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| Authors:
R. A. August; G. W. Phillips; J. H. Cutchin; NAVAL RESEARCH LAB WASHINGTON DC
|
| This report researches a concept for a high efficiency detector of fast neutrons (several MeV), using solid state charged particle detectors overlaid with thick disks (about mm) of 238U. Experiments show a significant count rate in our mock-up when exposed to a fast neutron flux, but it appears insensitive to the slow/thermal neutron flux. Our preliminary results indicate a system with an efficiency on the order of at least 5% ... |
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| Dose and Dose Rate Sensor for the Pocket Radiac. |
14 OCT 1988 |
|
| Authors:
Stanley Kronenberg; DEPARTMENT OF THE ARMY WASHINGTON DC
|
| The present invention relates generally to radiation detectors, and more particularly to small gamma ray and neutron dosimeters useful in measuring radiation on the nuclear battlefield. A radiation detector which registers the radiation absorbed during the Prompt Initial Radiation (PIR) phase following the detonation of a battlefield nuclear device is disclosed. The dose and dose rate attributable to gamma rays may be measured when the dose rate is low, and ... |
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| Effects of Neutron Irradiation on High Temperature Superconductors |
JUN 88 |
|
| Authors:
John J. Hammerer Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Neutron irradiation of high temperature superconductors was performed in order to determine the effects of nuclear weapons on these novel materials. This radiation could also be encountered in space radiation belts, fusion reactors and particle accelerators. Fluences used were on the order of 10 to the 18th power fast and thermal neutrons/sq cm. The result of the irradiation was a complete loss of observed superconductivity in YBa2Cu3O7 and ErBa2Cu3O7. A ... |
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| OPERATION DOMINIC, FISH BOWL SERIES. Project Officer's Report. Project 6.7. Debris Expansion Experiment |
01 SEP 1985 |
69 pages |
| Authors:
P. Dyal; W. Simmons; AIR FORCE WEAPONS LAB KIRTLAND AFB NM
|
| This experiment was designed to measure the interaction of expanding nuclear weapon debris with the ion-loaded geomagnetic field. Five rockets on Star Fish and two rockets on Check Mate were used to position instrumented payloads at various distances around the burst points. The instruments measured the magnetic field, ion flux, beta flux, gamma flux, and the neutron flux as a function of time and space around detonations. Data was transmitted ... |
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| OPERATION HARDTACK. Project 2.6. Neutron Flux from Very-High-Altitude Bursts, |
01 SEP 1985 |
|
| Authors:
T. D. Hanscome; P. B. Alers; P. A. Caldwell; R. J. Drachman; S. G. Gorbics; NAVAL RESEARCH LAB WASHINGTON DC
|
| The primary objective of this project was to measure neutron flux and gamma-ray flux versus range and time from missileborne, megaton nuclear detonations at high altitudes by means of instrumented pods that were to be ejected, during the missile thrust period, at times that were selected to position the pods at predetermined distances from the burst. Specific objectives were: (1) neutron flux versus time was to be measured at each ... |
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| OPERATION DOMINIC, FISH BOWL Series. Project Officer's Report - Project 2.2. Gamma Radiation Measurements, |
01 SEP 1985 |
|
| Authors:
J. W. Kinch; R. W. Jenkins; ARMY NUCLEAR EFFECTS LAB EDGEWOOD ARSENAL MD
|
| This project was conducted to measure the initial gamma dose as a function of distance fo Shots Star Fish Prime, Blue Gill Triple Prime and King Fish. To accomplish these objectives, the gamma dose was measured by film badges, glass microdosimeters, cobalt-activated borosilicate glass, calcium fluoride thermoluminescent dosimeters, and formic acid chemical dosimeters. The gamma dose versus distance was successfully measured from all three shots; and the gamma doses from ... |
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| OPERATION HARDTACK. Project 2.4. Neutron Flux and Large-Yield Bursts, |
01 SEP 1985 |
|
| Authors:
J. W. Kinch; D. L. Rigotti; J. Anderson; R. L. Bain; J. H. Rugheimer; CHEMICAL WARFARE LABS ARMY CHEMICAL CENTER MD
|
| The objectives of this project were to measure neutron flux and dose as a function of distance for two nuclear detonations and to make neutron flux measurements as required by other Department of Defense projects. The Hurst fission foil method was used to measure flux. Au197, Pu239, Np237, U238, S32, and Zr90 were employed as detecting materials. Steel buoys were used to support the detecting materials in the Enewetok lagoon. ... |
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| OPERATION SANDSTONE. Scientific Director's Report of Atomic Weapon Tests. Annex 4. Part 1. Threshold Detector Measurement of High Energy Neutron. |
01 SEP 1985 |
|
| Authors:
G. A. Linenberger; William Ogle; LOS ALAMOS NATIONAL LAB NM
|
| The activity induced in various threshold detectors by the radiation from the Sandstone bombs has been measured. All measurements were made without collimation. The results indicate that the efficiency of a bomb cannot be determined by observing the number of neutrons above three million electron volts energy, but that the tonnage may possibly be proportional to the number of very high energy gamma rays produced. |
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| Initial Result of the Army Background Experiment |
1985 |
12 pages |
| Authors:
W. C. Feldman; G. F. Auchampaugh; E. R. Shunk; LOS ALAMOS NATIONAL LAB NM
|
| The Army Background Experiment was commissioned in April 1987 to measure the space neutron background near the Earth. It was launched aboard the LACE spacecraft in February 1990 and has operated flawlessly since turn on. All overview of the experiment and initial results from space are presented. Preliminary analysis indicates that all experimental objectives should be achieved within the nominal 30-month lifetime of LACE. |
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| Lithium-6 Coated Wire Mesh Neutron Detector. |
06 NOV 1984 |
|
| Authors:
C. A. Young; B. D. Geelhood; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A neutron detection apparatus is provided which includes a selected number of surfaces of lithium-6 coated wire mesh and which further includes a gas mixture in contact with each sheet of lithium-6 coated wire mesh for selectively reacting to charged particles emitted or radiated by the lithium-6 coated mesh. A container is provided to seal the lithium-6 coated mesh and the gas mixture in a volume from which water vapor ... |
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| Operation Plumbbob. Program 2. Neutron and Gamma Radiation from Shot Laplace, |
31 OCT 1984 |
|
| Authors:
J. A. Chiment; J. L. Goetz; G. C. Facer; KAMAN TEMPO SANTA BARBARA CA
|
| The objectives of this experiment were to determine, for Shot Laplace, a 1.22-kt device fired late in Operation Plumbbob: (1) intensity and decay of the neuron-induced gamma-field; (2) neutron flux and spectra as a function of distance; (3) neutron flux as a function of soil depth with certain selected detectors; and (4) neutron dose and initial gamma dose as a function of distance. Keywords: Nuclear explosion testing; NTPR (Nuclear Test ... |
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| Initial Gamma Data from Nuclear Weapon Tests 1948 through 1962, |
01 JUN 1984 |
|
| Authors:
R. J. Smith; R. E. Benck; E. E. Lissak; ARMY NUCLEAR EFFECTS LAB EDGEWOOD ARSENAL MD
|
|
| Study of O2 (1 Delta) Production by Nuclear Pumping |
APR 1984 |
|
| Authors:
G. H. Miley; ILLINOIS UNIV AT URBANA DEPT OF NUCLEAR ENGINEERING
|
| Experimental studies using a fast-burst neutron reactor to produce O2(1 delta) for use in an iodine transfer laser are described. It was found that nuclear induced discharges in Oxygen-buffer gas mixtures favor copious ozone production at the expense of O2(1 delta) concentrations. Experimental results, kinetics, and scaling relations are given. Additional theoretical analyses of O2(1 delta) production at high pressure using nuclear-pumped flash-lamp photolysis of the ozone indicates an alternate ... |
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| Operation HARDTACK. Project 2.12c. Soil Activation by Neutrons from a Very-Low-Yield Burst. |
30 MAR 1984 |
|
| Authors:
E. F. Wilsey; J. H. McNeilly; R. J. Spitznas; KAMAN TEMPO SANTA BARBARA CA
|
|
| Recent Re-Measurement of Neutron and Gamma-Ray Spectra 1080 Meters from the APRD (Army Pulse Radiation Division) Critical Facility |
JAN 1984 |
|
| Authors:
H. A. Robitaille; B. E. Hoffarth; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Previously reported measurements of long-range air-transported neutron and gamma-ray spectra from the fast-critical facility at the US Army Aberdeen Proving Ground have been supplemented recently at the 1080-meter position. The results of these determinations are presented herein and compared to several recent calculations from other research establishments. In addition, a summary of all dosimetric measurements obtained in the period 1979-1982 are appended, as are new determinations of APRD soil composition. ... |
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| Kerma Factors for Use in 37-Group Neutron Spectrum Calculations |
DEC 1983 |
|
| Authors:
G. H. Zeman; W. S. Bice Jr; ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
|
| Neutron kerma factors have been regrouped from the format of the International Commission on Radiation Units and Measurements Report 26 (ICRU-26) to supplement those available in the 37-group format of the Oak Ridge Data Library Collection 31 (DLC-31). Lists of regrouped neutron kerma factors are presented for eight elements and for seven compounds and mixtures. For several elements, disagreements in excess of 15% were observed between those neutron kerma factors ... |
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| Neutron Leakage from 'COMET' - A Duplicate Little-Boy Device |
DEC 1983 |
|
| Authors:
H. A. Robitaille; B. E. Hoffarth; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Fast neutron spectra between 600 keV and 10 MeV, directed outwards from the surface of the 'COMET' assembly, were measured using an NE-213 fast- neutron spectrometer at the Los Alamos National Laboratory. The COMET experiment, consisting of a duplicate Little-Boy device suitably modified for operation in the delayed-critical regime, was to provide improved energy and angular distributions of leakage spectra in support of efforts to re-evaluate ground doses from the ... |
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| Thermonuclear Burn in Cylindrical Targets |
MAY 1983 |
|
| Authors:
J. Buff; M. Alme; MISSION RESEARCH CORP ALBUQUERQUE NM
|
| Thermonuclear burn in cylindrical targets imploded by fast plasma linear devices are considered. The benefits of limiting the thermal conduction and trapping the alpha particles as might be expected in the presence of a strong magnetic field are studies. It will be extremely difficult to achieve good thermonuclear burn in cylindrical targets with fast plasma liner devices. However, a large neutron flux (10 to the 15th power - 3 X ... |
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| USSR Report, Engineering and Equipment, No. 94 |
20 APR 1983 |
|
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
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| Effects of Approximate Radiation Treatments Used in the Climate Models in the Clear Sky Thermal Radiation Flux and Its Perturbation Due to Carbon Dioxide Increase. |
JAN 1983 |
|
| Authors:
Wei-Chyung Wang; DEPARTMENT OF ENERGY WASHINGTON DC OFFICE OF ENERGY RESEARCH
|
| This report presents an assessment of the effects of approximate radiation treatments commonly adopted in the climate models on the calculated thermal radiation flux and its perturbation due to carbon dioxide increase. Specifically, we examine the uncertainties in the calculated clear sky thermal flux associated with the approximations (Curtis-Godson and correlated-k methods) for inhomogeneous atmosphere, the use of exponential kernel (diffusivity factor) approximation, the treatment of model layer temperature (constant ... |
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| Pure-Silica Core Optical Fiber and Fiber Cable for Radiation Fields, |
NOV 1982 |
|
| Authors:
Hiroyuki Tanaka; Toshihiro Hirashima; Takeshi Shintani; DAINICHI-NIPPON CABLES LTD TOKYO (JAPAN)
|
| Using C0 60 gamma ray and fast neutron flux from a research reactor, in situ measurements of radiation induced optical attenuation have been conducted to characterize the radiation response of pure-silica core fibers and doped-silica core fibers. It has been revealed that pure-silica core fibers fabricated by Modified Rod-in-Tube method have much higher radiation resistivity than Ge/P-and B/F/P-doped-silica core MCVD fibers. Among the pure-silica core fibers, high-OH content grade has ... |
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| An Activation-Type Neutron Detection System and Its Calibration. |
04 JUN 1982 |
|
| Authors:
J. W. Kinch; D. L. Rigotti; KAMAN TEMPO SANTA BARBARA CA
|
|
| Niobium-Base Alloy. |
10 NOV 1981 |
|
| Authors:
David J. Michel; Hugh H. Smith; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An alloy which is significantly resistant to swelling and irradiation induced hardening when exposed to a high-neutron flux at high temperatures is obtained by alloying from 3 to 7 weight percent of molybdenum and from 0.8 to 1.2 weight percent of zirconium with niobium. (Author) |
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| Aircrew Shielding to Fast Neutrons from Nuclear Detonations |
01 JUL 1981 |
|
| Authors:
Rayford P. Patrick; STRATEGIC AIR COMMAND OFFUTT AFB NE AIRCRAFT ENGINEERING DIV
|
| Future technological advances by enemy nations could compromise the effectiveness of our nuclear hardened manned systems. This study addresses the feasibility of incorporating fast neutron shields into the systems. Such shielding would enhance systems survivability and be very compatible with the use of advanced ECM and bomber defense systems such as missiles, LASERs, and particle beam weapons. It is shown that shielding providing mission completion capability for human aircrews (hence ... |
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| Operation REDWING. Program II. Nuclear Radiation and Effects Consolidated Program Book. |
15 MAY 1981 |
|
| Authors:
D. C. Campbell; KAMAN TEMPO SANTA BARBARA CA
|
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| Operation SUN BEAM. Shot Small Boy, Project Officers' Report. Project 2.1. Initial Radiation Measurements, |
01 MAY 1981 |
|
| Authors:
Paul A. Caldwell; KAMAN TEMPO SANTA BARBARA CA
|
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| Operation PLUMBBOB. Neutron-Induced Activities in Soil Elements. Project 2.2. |
01 FEB 1980 |
|
| Authors:
GENERAL ELECTRIC CO SANTA BARBARA CA TEMPO
|
| Neutrons which escape following the detonation of a nuclear device interact with matter within range of the neutron flux. Some of these interactions produce radioactive isotopes. It was the purpose of this project to study the nature of this radioactivity, especially the problems associated with induced radioactivity in soils near ground zero. |
|
| Operation Ranger. Volume 3. Program Report-Weapons Development. |
01 FEB 1980 |
|
| Authors:
KAMAN TEMPO SANTA BARBARA CA
|
|
| Test Director's Report on Operation PLUMBBOB. |
01 FEB 1980 |
|
| Authors:
GENERAL ELECTRIC CO SANTA BARBARA CA TEMPO
|
|
| Operation PLUMBBOB. Project 2.4. Neutron and Initial-Gamma Shielding. |
01 FEB 1980 |
|
| Authors:
GENERAL ELECTRIC CO SANTA BARBARA CA TEMPO
|
|
| Operation SNAPPER. The Biological Effectiveness of Neutron Radiation from Nuclear Weapons. Project 4.3. |
01 FEB 1980 |
|
| Authors:
GENERAL ELECTRIC CO SANTA BARBARA CA TEMPO
|
| Experiments dealing with the biological effectiveness of neutron radiation from nuclear weapons were included in Operation TUMBLER-SNAPPER for two reasons. First, confirmation of the results of similar experiments done at Operation GREENHOUSE was desired. Second, evaluation of the effect of neutron irradiation on organ systems and biological parameters not measured at Operation GREENHOUSE was considered necessary. Three weapons were used for the TUMBLER-SNAPPER studies. On all three shots, organ-weight loss ... |
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| Integral Equation Space-Energy Flux Synthesis for Spherical Systems. |
21 NOV 1979 |
|
| Authors:
Eugene W. Skluzacek; AIR FORCE TECHNICAL APPLICATIONS CENTER PATRICK AFB FL
|
| The calculations of neutron flux distribution and growth rate for small, spherically symmetric systems usually requires extensive computing time on the largest machines. To minimize computing time, a compromise between the simplicity of diffusion theory and the accuracy of transport theory is needed. The Serber-Wilson method, Feynman's method, and early flux synthesis methods are used as the foundation for integral equation synthesis (IES) which is an approximate, numerical technique for ... |
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| Operation PLUMBBOB. Project 39.1b. Neutron Dosimetry by the Threshold-Detector Technique. |
01 OCT 1979 |
|
| Authors:
GENERAL ELECTRIC CO SANTA BARBARA CA TEMPO
|
| This report describes neutron-flux and dose determinations made in Operation Plumbbob with the Hurst threshold-detector technique. The measurements were made by personnel engaged in work on Civil Effects Test Group (CETG) Project 39.5 for other projects in the CETG program. (Author) |
|
| Operation TUMBLER-SNAPPER. External Neutron Measurements. Projects 17.1 and 17.2. |
01 OCT 1979 |
|
| Authors:
C. L. Cowan; W. A. Walker; GENERAL ELECTRIC CO SANTA BARBARA CA TEMPO
|
| Operation Snapper consisted of five shots at the Nevada Proving Grounds fired in the spring of 1952 immediately following the three shots which comprised Operation Tumbler. Part 1 of this report presents the measurement of neutron flux external to the bomb made in poor geometry as functions of distance and energy with threshold detectors and as functions of time in both poor and good geometries. Descriptions of equipment and techniques ... |
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| Operation PLUMBBOB. Project 41.1a. Fireball Studies. |
01 OCT 1979 |
|
| Authors:
GENERAL ELECTRIC CO SANTA BARBARA CA TEMPO
|
| Measurements of gamma-radiation flux versus time, time-integrated gamma-radiation flux, time-integrated neutron flux with energy-sensitive detectors, air pressure, time-integrated radiant energy, radiant-energy flux with some spectral response, and gaseous electrical conductivity in and near an atomic fireball are reported. These measurements were made in support of weapon vulnerability studies. |
|
| Operation PLUMBBOB. Soil Activation by Neutrons. Project 2.1. |
01 OCT 1979 |
|
| Authors:
DEPARTMENT OF ENERGY WASHINGTON DC
|
|
| Determination of the Fluorine Content of Fluorochemical-Treated Fabrics by Neutron Activation Using the 19F(n,2n)18F Reaction, |
OCT 1979 |
|
| Authors:
F. A. Johnson; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| An analytical procedure has been developed for determining the fluorine content of fluorochemical-treated fabrics by activation with fast neutrons, using Teflon film as the reference standard. The ultimate success of the technique depends on effective retention of the active recoil F18 nuclei produced in the F19(n,2n) F18 reaction, which is accomplished by sealing all samples individually in Mylar film. It is demonstrated that recoil protons produced in the fabric substrate ... |
|
| The Effectiveness of Various Local Shielding Arrangements Erected Near the Target of the DREO Neutron Generator in Reducing the Biological Hazard at Specific Locations on the DREO Site. |
SEP 1979 |
|
| Authors:
F. Allan Johnson; Jean-Roch Brisson; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The effectiveness of various forms of shielding near the target of the neutron generator in reducing the dose rate at specific locations on the DREO site has been investigated. It would appear possible to satisfy AECB requirements so far as reducing the dose rate along the perimeter fence bordering the railway right-of-way is concerned, but substantial additional shielding would be required to reduce the dose rate significantly at the nearest ... |
|
| Effect of Neutron Irradiation on Fatigue Crack Propagation in Type 316 Stainless Steel at 649C. |
14 MAR 1979 |
|
| Authors:
D. J. Michel; H. H. Smith; NAVAL RESEARCH LAB WASHINGTON DC
|
| The effect of fast neutron irradiation on the fatigue crack propagation performance of Type 316 stainless steel was investigated at 649C and compared with previous results at 593C. The results show that, during continuous cycling, no significant effect of irradiation on crack propagation rate was observed in annealed steel. The inclusion of a one minute hold time increased the crack propagation rates in the irradiated annealed steel when compared with ... |
|
| Some Analytical and Numerical Results for Cladded Fuel Rods Subjected to Thermoirradiation Induced Creep. |
JAN 1979 |
|
| Authors:
S. Huang; F. A. Cozzarelli; STATE UNIV OF NEW YORK AT BUFFALO DEPT OF ENGINEERING SCIENCE AEROSPACE ENGINEERING AND NUCLEAR ENGINEERING
|
| Stresses and velocities are analyzed for a hollow cylinder of fuel encased in metallic cladding and subjected to high temperature and high neutron flux fields. The material is represented by a compressible nonlinear thermoirradiation viscoelastic model. A stress function for axisymmetric plane strain is introduced, and the problem essentially reduces to solving a nonlinear ordinary differential equation in the interfacial contact pressure. Some analytic results are obtained for the case ... |
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Reports by Keyword(s)
NEUTRON FLUX
