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in subjects: "Geiger-Mueller Counters"  
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Energy response and dose-rate calibration of a Geiger-Mueller gamma-ray detector

Description: To obtain more precise dose-rate measurements, we have taken a commercial gamma-ray dosimeter that uses a Geiger-Mueller (GM) tube as its detector and, by supplying it with an externally regulated high voltage, counted the gamma-ray-induced pulses with suitable scaling and timing circuits. We have now improved the method of calibration by measuring detector response to 13 different sources, each with an independently verified strength, in the energy range from 60 keV to 2.6 MeV. With the use of… more
Date: January 1, 1984
Creator: Plassmann, E.A.; Pederson, R.A. & Moss, C.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New-generation low-power radiation survey instruments. [Powered by capacitor]

Description: A number of new, ultra-low-powered radiation instruments have recently been developed at Los Alamos. Among these are two instruments which use a novel power source to eliminate costly batteries. The newly developed gamma detecting radiac, nicknamed the Firefly, and the alpha particle detecting instrument, called the Simple Cordless Alpha Monitor, both use recent advances in miniaturization and power-saving electronics to yield devices which are small, rugged, and very power-frugal. The two inst… more
Date: January 1, 1983
Creator: Waechter, D. A.; Bjarke, G. O.; Wolf, M. A.; Trujillo, F. & Umbarger, C. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Gamma-ray dosimetry measurements of the Little Boy replica

Description: We present the current status of our gamma-ray dosimetry results for the Little Boy replica. Both Geiger-Mueller and thermoluminescent detectors were used in the measurements. Future work is needed to test assumptions made in data analysis.
Date: January 1, 1984
Creator: Plassmann, E.A. & Pederson, R.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Microcomputer based shelf system to monitor special nuclear materials in storage

Description: Diversion of special nuclear material has become a matter of grave concern in recent years. Large quantities of this material are kept in long-term storage and must be inventoried periodically, resulting in a time-consuming activity that exposes personnel to additional radiation. A system that provides continuous surveillance of stored special nuclear materials has been developed. A shelf monitor has been designed using a single component microcomputer to collect data from a Geiger Muller tube … more
Date: January 1, 1980
Creator: Nicholson, N.; Kuckertz, T.H. & Ethridge, C.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Some solutions to on-line radiological monitoring of difficult streams

Description: On-line monitoring for radiological contamination of dirty, but normally not radioactive, streams is difficult. Described are several new, low-fouling units that are intended to replace the existing sensors that monitor both beta and gamma activity. A sensor was designed, using a thin-wall Geiger-Mueller tube for beta and gamma sensitivity, to monitor the influent of the sanitary sewage treatment plant. The new design eliminates dead volumes inherent in the old unit by use of a double-layer, he… more
Date: January 1, 1987
Creator: Bauer, M.L. & Ramsey, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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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
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DETECTION OF ThO$sub 2$ CONTAMINATION IN SIMULATED CUTS AND ABRASIONS

Description: Tests have been made to determine the sensitivity of various radiation detection instruments for known amounts of ThO/sub 2/ contained in simulated cuts and abrasions. A shielded Geiger-Mueller counter tube can be expected to detect at least 0.1 mg ThO/sub 2/ when counting for a reasonable length of time provided the ThO/sub 2/ deposit is on the surface of the subject being counted. A shielded gamma-spectrometer-crystal, set at a 50-kev cutoff, can be expected to detect at least 0.5 mg ThO/sub … more
Date: January 15, 1959
Creator: Thomas, D. G. & Hilyer, J. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of Electron Attachment in Oxygen-Methane and Oxygen-Carbon Dioxide Mixtures

Description: The formation of heavy negative ions by the attachment of low-energy electrons to oxygen molecules was studied for small amounts of oxygen mixed with methane or carbon dioxide. The rate of attachment in both cases was found to depend on the electron energy, the pressure of the oxygen and the non-attaching gas, and on the kind of non-attaching gas. In general, the attachment increases as electron enprgy decreases or as either oxygen or total pressure increases. The value of the attachment coeffi… more
Date: January 25, 1960
Creator: O'Kelly, L. B.; Hurst, G. S. & Bortner, T. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Multipurpose radiac for field surveys and training

Description: The Instrument Technologies Group at Los Alamos has developed a multipurpose radiac. It uses a variety of detectors coupled with a CMOS microprocessor to provide ease of use and an unambiguous display. It allows concurrent surveys for alpha, beta, gamma, and neutron radiation. In addition, it has an external data link for coupling to and from data acquisition/storage equipment, hence making it a perfect training tool. The instrument is small (4x8x2.4 in.) and lightweight (<2 lbs). It runs for 5… more
Date: January 1, 1984
Creator: Wolf, M. A.; Bjarke, G. O. & Jarrett, J. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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