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Factors of Safety

Description: Factors of safety serve three purposes: provides against trouble arising from unexpectedly large loads, allows for imperfections of workmanship, represents a depreciation allowance. A consideration of these safety factors is provided in this report.
Date: December 1923
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department

EXPERIMENTAL EVALUATION OF THE RADIATION PROTECTION AFFORDED BY TYPICAL OAK RIDGE HOMES AGAINST DISTRIBUTED SOURCES

Description: The protection afforded against simulated fall-out radiation has been evaluated for several typical homes in the Oak Ridge area. Nine houses were chosen to represent a variety of construction materials, topographical conditions and sizes; they included three types of Oak Ridge Cemesto houses, one concrete-block house with a basement fall-out shelter, and two wood-frame houses. The protection factor (ratio of open-field exposure dose rate to exposure dose rate in the house) in all these houses ranged from 2 to 5 on the main floor and from 5 to 30 in the basements, except in the fall-out shelter, where the protection factor was greater than 100. The analysis showed that sloping lots. common to Oak Ridge, do not appreciably affect the protection factor for the main floor. Owing to the generally increased exposure of the basement walls on such lots, the protection factors in the basements were typically lower than in similar basements built on level lots. (auth)
Date: January 1, 1960
Creator: Strickler, T.D. & Auxier, J.A.
Partner: UNT Libraries Government Documents Department

The LINAC Coherent Light Source and Radiological Issues During the Commissioning

Description: The Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory is the world's first X-ray free electron laser (XFEL). Pulses of x-ray laser light from LCLS will be many orders of magnitude brighter and several orders of magnitude shorter than what can be produced by other x-ray sources available in the world. These characteristics will enable frontier new science in many areas. This paper describes the LCLS beam parameters and lay-out. The general radiological issues during commissioning are presented, such as radiation dose rates and integrated doses outside the enclosure. Also, specific radiological issues related to X-ray free electron lasers are discussed. XFEL with high peak power will burn through high-Z materials. The X-ray beam needs to be blocked by stoppers when the downstream areas are occupied. LCLS stoppers feature a piece of boron carbide (B{sub 4}C), 10 mm thick. B{sub 4}C is one of the best materials since it has a low absorption coefficient for X-rays and a high melting temperature. Theoretical calculations indicate that the unfocused fluence of the LCLS XFEL beam should be about one order of magnitude below the damage threshold for bulk B{sub 4}C, for 830 eV FEL radiation. However, these calculations have not been tested experimentally and cannot be validated until LCLS begins providing 830 eV XFEL pulses. This paper describes the test plan for using the initial LCLS radiation to evaluate the survivability of B{sub 4}C and reports the preliminary results. Another major issue for LCLS is the potential radiation damage to the LCLS undulator magnets during operation. TLD dosimeters were installed along the LCLS undulators for each period of two or three weeks. This paper reports the integrated doses along the undulators with and without XFEL generation.
Date: August 26, 2010
Creator: Mao, X.S.; Leitner, M.Santana; Vollaire, J. & /SLAC
Partner: UNT Libraries Government Documents Department

Some Essential Safety Factors in Tunneling

Description: From Purpose of Report: "This paper is based partly upon the authors' observations and partly upon studies of tunnel driving; these cover essentially all types of tunnels in various parts of the United States during the past 25 years."
Date: 1941
Creator: Harrington, D. & Ash, S. H. (Simon Harry), b. 1889
Partner: UNT Libraries Government Documents Department

Bibliography of Bureau of Mines Health and Safety Publications: January 1947-June 1955

Description: From Introduction: "While the basic purpose of this bulletin is to describe health and safety reports for the period January 1947 through 1955, a selected number of earlier publications that are believed pertinent for reference purposes are included."
Date: 1956
Creator: Humphrey, H. B. & Stratton, Hazel J.
Partner: UNT Libraries Government Documents Department

Information on the Prevention of Quarry Accidents

Description: From Introduction: "The primary objective of this paper is to discuss the hazards and furnish a list of recommendations for the safe operation of the quarries and related works. The second objective is to describe and illustrate safety devices, practices, and quarrying methods."
Date: 1950
Creator: Harrington, D.; Worcester, A. W. & East, J. H., Jr.
Partner: UNT Libraries Government Documents Department

Permissible Electric Cap Lamps and Ventilation in Certain California Mines and Water-Tunnel Construction

Description: From Introduction: "As a result of the recommendations of this committee, special studies have been made of the methane hazards incident to mining and tunneling operations in the Coast Range Mountains. These studies have resulted in the adoption of numerous safety precautionary measures; among them the use of permissible types of mining equipment, electric cap lamps, with which this deals with primarily."
Date: 1932
Creator: Ash, S. H. (Simon Harry), b. 1889 & Rankin, J. H.
Partner: UNT Libraries Government Documents Department

Technology of Liquid Helium

Description: From Abstract: "This treatise is a source document containing information on helium resources, production, conservation, thermodynamic properties, liquefaction and refrigeration techniques, transportation and storage of liquid and safety requirements. It also contains a discussion of uses for liquid and cold gas in cryoelectronics, superconductivity, bubble chambers, cryopumping and missile and space systems."
Date: October 1968
Creator: Kropschot, R. H.; Birmingham, B. W. & Mann, D. B.
Partner: UNT Libraries Government Documents Department

Underground Limestone Mining

Description: From Introduction: "The aim of the report is to help the superintendent and the operator to adopt the safest and most efficient methods of removing rock underground."
Date: 1926
Creator: Thoenen, J. R.
Partner: UNT Libraries Government Documents Department

Review of Safety and Health Conditions in the Mines at Butte

Description: From Introduction: "This review of safety and health conditions in the mines of Butte, Mont., is prepared from data gathered during the period 1916 to 1924, inclusive, chiefly by Daniel Harrington, who was until recently supervising mining engineer of the Bureau of Mines."
Date: 1925
Creator: Rice, G. S. & Sayers, R. R.
Partner: UNT Libraries Government Documents Department

Gases from Blasting in Tunnels and Metal-Mine Drifts

Description: From Introduction: "This paper gives the results of sampling the gases from blasting drift rounds at five mines-the United Verde Extension, Calumet & Arizona, Old Dominion, Mountain Copper, and the United Verde-and of tunnel rounds at the Big Creek water tunnel and Moffat railroad tunnel. The paper also describes the rounds blasted and the methods of sampling and analyzing the gases. In all, 99 rounds were fired and 376 samples were taken."
Date: 1927
Creator: Gardner, E. D.; Howell, S. P. & Jones, G. W.
Partner: UNT Libraries Government Documents Department