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Test Results on Clinton Alpha Amplifier Used with an Offner Columbia Scaler

Description: Technical report describing development of the Clinton alpha amplifier. The circuit for the Clinton alpha amplifier which is used with an Offner scaler is shown attached to the report. It consists of a pre-amplifier mounted in a cylindrical alpha chamber, followed by a three state amplifier and a pulse height selector in a separate cabinet. Pulses are fed from the pulse height selector in the amplifier to the input tube of the Offner scaler. Through the third stage of the amplifier, this circu… more
Date: July 1, 1944
Creator: Ostdahl, H. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Test Results on Bias Setting for the Chicago Scaler Offner Models

Description: Abstract: The counting accuracy of the Chicago Scalers, Models 961A and 961B, is a function of the bias setting of the limiter (V2). this report gives quantitative data supporting this thesis. A method of making bias settings is suggested. These tests were run at the suggestion of Mr. V. C. Hanson.
Date: September 11, 1944
Creator: Bradley, Wendell H.; Epstein, Bernard. & Wakefield, Ernest
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Manufacturing Specifications for the Higinbotham Scaler

Description: Technical report which includes a description of scaling action in a Higinbotham circuit, of operation of the output circuit, of operation of the regulated high voltage supply. Acceptance and performance specifications are given. also included are cuts showing the bottom and top view of a scaler of this type. The scaling circuit diagram and major parts list is attached. To facilitate testing, the circuit of a satisfactory pulse generator is included together with a cathode - follower.
Date: November 9, 1944
Creator: Wakefield, Ernest
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Self-consistent temperature compensation for resonant sensors with application to quartz bulk acoustic wave chemical sensors

Description: Since resonant sensors have a temperature sensitivity which is often greater than their sensitivity to the phenomena they are being used to detect, it is imperative to include either temperature control or temperature compensation in any resonant sensor system. The authors have developed a temperature-compensation scheme for resonant sensors which is amenable to integration into a resonator-driver integrated circuit. An integrated circuit incorporating this scheme has been designed, built, and … more
Date: May 1, 1995
Creator: Smith, J.H. & Senturia, S.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Simplified operation manual PA-720 particle counter

Description: The model PA-720 Automatic Particle Size Analyzer is a simple, relatively high speed device designed to provide accurate size distributions in both tabular and graphic forms. This model has two dynamic ranges; 50 to 2500 microns and 200 to 1600 microns. This is an abbreviated version of the manufacturer's operating manual. It provides all the necessary information for the novice and experienced user. For more detailed explanations and servicing procedures one should reference the full manual.
Date: September 8, 1980
Creator: Draper, V. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Feedback threshold control extends pulse rate measurements into the pileup region

Description: By using feedback control of the discrimination threshold we have added 4 to 6 decades to the useful range of otherwise conventional pulse counting systems. The additional range is obtained at the high end by retarding saturation of the output count rate with higher threshold levels. We have implemented the method with low-power microcircuits that provide a 9-decade range (10/sup -5/ to 10/sup 4/ R/h) without the need for range or mode switching.
Date: January 1, 1986
Creator: Valentine, K.H.; Kopp, M.K. & Williams, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A multi-channel ADC for use in the PHENIX detector

Description: A custom CMOS analog to digital converter was designed and a prototype 8-channel ADC ASIC was fabricated in a 1.2 {mu}m process. The circuit uses a Wilkinson-type architecture which is suitable for use in multi-channel applications such as the PHENIX detector. The ADC design features include a differential positive-ECL input for the high speed clock and selectable control for 11 or 12-bit conversions making it suitable for use in multiple PHENIX subsystems. Circuit topologies and ASIC layout sp… more
Date: December 31, 1996
Creator: Emery, M. S.; Frank, S. S.; Britton, C. L., Jr.; Wintenberg, A. L.; Simpson, M. L.; Ericson, M. N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High temperature superconducting digital circuits and subsystems

Description: The advances in the fabrication of high temperature superconducting devices have enabled the demonstration of high performance and useful digital circuits and subsystems. The yield and uniformity of the devices is sufficient for circuit fabrication at the medium scale integration (MSI) level with performance not seen before at 77 K. The circuits demonstrated to date include simple gates, counters, analog to digital converters, and shift registers. All of these are mid-sized building blocks for … more
Date: October 1, 1993
Creator: Martens, J. S.; Pance, A.; Whiteley, S. R.; Char, K.; Johansson, M. F.; Lee, L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ELECTROSTATIC SURFACE STRUCTURES OF COAL AND MINERAL PARTICLES

Description: We have developed a video image analyzer for measuring the size and charge of airborne particles. Particles are illuminated by laser light and subjected to a sinusoidal electric field while images of the trajectories of the particles are captured using a video camera and a frame grabber. Analysis of the particle tracks allows the size and charge of the particles to be determined. The instrument can be used to measure size and charge spectra of charged coal and mineral particles in real time. Ap… more
Date: April 1, 1999
Creator: Mazumder, M.K.; Lindquist, D.A. & Tennal, K.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Scaler modules for radiation detection systems

Description: In developing radiation detection instrumentation at Rocky Flats, a system concept using plug-in modules was planned. Losses of operational time due to maintenance are drastically reduced as a malfunctioning module can be replaced within minutes. Versatility is another advantage of the modular concept and a particular module can be used in many different system designs. A significant cost savings in system development can also be realized. The scalers described are housed in one-wide Nuclear In… more
Date: March 28, 1974
Creator: Martin, B. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Statistical design of mass spectrometry calibration procedures

Description: The main objective of this task was to agree on calibration procedures to estimate the system parameters (i.e., dead-time correction, ion-counting conversion efficiency, and detector efficiency factors) for SAL`s new Finnigan MAT-262 mass spectrometer. SAL will use this mass spectrometer in a clean-laboratory which was opened in December 1995 to measure uranium and plutonium isotopes on environmental samples. The Finnigan MAT-262 mass spectrometer has a multi-detector system with seven Faraday … more
Date: November 1, 1996
Creator: Bayne, C.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Design of optimized RC-CR filters for current-pulse operation of fission counters and high sensitivity fission counters for high gamma backgrounds

Description: A calculational procedure was developed to design RC-CR filters for processing current pulses from fission counters in a gamma background ranging from 10$sup 5$ to 6 x 10$sup 6$ R/hr. The effects of noise from the gamma background and the input preamplifier and of the time constant of the fission counter and input cable were studied. Analytical results were in close agreement with experimental data. A pole-zero network was examined as a means of compensating for the time constant of the fission… more
Date: January 1, 1975
Creator: DeLorenzo, J.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Portable shift register

Description: An electronics package for a small, battery-operated, self-contained, neutron coincidence counter based on a portable shift-register (PSR) has been developed. The counter was developed for applications not adequately addressed by commercial packages, including in-plant measurements to demonstrate compliance with regulations (domestic and international), in-plant process control, and in-field measurements (environmental monitoring or safeguards). Our package's features, which address these appli… more
Date: January 1, 1994
Creator: Halbig, J. K.; Bourret, S. C.; Hansen, W. J.; Hicks, D. V.; Klosterbuer, S. F. & Krick, M. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pulse pile-up effects

Description: The energy spectrum containing the effects of all orders of pulse pileup is predicted for an idealized x-ray pulse-height-analysis system measuring randomly occurring events. Two simplifying assumptions used are first a fixed pulse resolution time and second that the measured energy of piled-up pulses is the algebraic sum of the energy associated with each pulse.
Date: May 1, 1983
Creator: Tenney, F.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Recent developments in multiplicity counting hardware at Los Alamos

Description: Neutron coincidence counting has played an important role in determining the mass of fissile material in safeguards and nuclear industry samples. The principle is simple; the mass of material is proportional to the spontaneous fission rate. During the fission process, multiple neutrons are emitted within a very short time frame, that is, in coincidence. The number of neutrons emitted in coincidence determines the multiplicity of the event. The challenge is to determine the spontaneous fission r… more
Date: December 31, 1991
Creator: Halbig, J. K.; Bourret, S. C.; Collinsworth, P. R.; Hansen, W. J. & Krick, M. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Shift register neutron coincidence module

Description: A neutron coincidence module was designed using multistage shift registers to produce the coincidence gates and a crystal controlled oscillator with variable clock outputs to change the gate lengths. The advantage of this system over the conventional, thermal-neutron coincidence gates is a decrease in deadtime by more than an order of magnitude. (auth)
Date: November 1, 1975
Creator: Stephens, M. M.; Swansen, J. E. & East, L. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Event matrix system. [To eliminate high-rate backgrounds]

Description: The number of background events in nuclear and particle physics experiments which use multiwire proportional chambers can be extremely high. Using a computer to resolve these events results in a high deadtime for the experiment. A fast matrix system for decreasing the number of background events is described in this report. 4 figures.
Date: March 1, 1978
Creator: Dalton, C.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Portable survey instrument for low levels of transuranic contaminants. [Phoswich scintillator]

Description: A fully portable survey instrument for low levels of transuranic nuclides has been designed. The design takes advantage of the properties of a phoswich scintillator to detect low-energy photons and discriminate against higher energy Compton-scattered events.
Date: July 1, 1977
Creator: Wolf, M. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimum filters with time width constraints for liquid argon total-absorption detectors

Description: Optimum filter responses are found for triangular current input pulses occurring in liquid argon ionization chambers used as total absorption detectors. The filters considered are subject to the following constraints: finite width of the output pulse having a prescribed ratio to the width of the triangular input current pulse and zero area of a bipolar antisymmetrical pulse or of a three lobe pulse, as required for high event rates. The feasibility of pulse shaping giving an output equal to, or… more
Date: October 1, 1977
Creator: Gatti, E. & Radeka, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SLIFER Decipher

Description: The SLIFER Decipher (SD) is a digital instrument that records a time-varying frequency signal in the range from 700 kHz to 1500 kHz with an amplitude greater than 200 mV. This signal is referenced to an input fiducial marker. The primary purpose of this instrument is to reduce data recorded on magnetic tape from the SLIFER system used in underground nuclear tests. The SD records 512 samples after the fiducial signal, with a sample interval of 50 ..mu..s (for a total recording time of 25.55 ms).… more
Date: October 1, 1977
Creator: Breding, D.R.; Worthen, G.S.; Loukota, J.J.; Fogel, D. & Watterberg, J.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Birdcage neutron coincidence counter manual

Description: A thermal neutron coincidence counter has been constructed for the assay of fast critical assembly fuel plates stored in birdcages. Standard coincidence counting electronics are used. This manual describes the birdcage, the measurement system, and its performance characteristics. 3 refs.
Date: July 1, 1985
Creator: Krick, M. S.; Menlove, H. O. & Ramalho, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The performance of a single-crystal BGO annulus as a Compton- suppression detector

Description: We have tested a single-crystal bismuth-germanate annulus in conjunction with a high-purity germanium detector as a Compton-suppression spectrometer, and have measured gamma-ray energies of up to 6.13 MeV. 1 ref., 9 figs., 2 tabs.
Date: January 1, 1991
Creator: Ussery, L.E. (Los Alamos National Lab., NM (United States)) & Matthews, S.K. (George Washington Univ., Washington, DC (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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