A Borehole Probe for In Situ Neutron Activation Analysis

Details

• Personal Author:
  Baicker JA ; Goldman LH ; Lister DB ; Marr RE
• Description:
  A prototype borehole probe for ore grade determinations by means of in situ neutron activation analysis was designed, built, and tested in a two-phase program. Phase I dealt with the design and fabrication of a borehole logging system for operation in 7.6 Cm (3 in) diameter or larger boreholes. It consisted of a 5.06 Cm (2 in) diameter borehole probe containing an intrinsic germanium detector, a canister-type solid cryogen cooling system, cooled field-effect transistor preamplifier, linear amplifier, high voltage supply, analog-to-digital converter, microprocessor-based multichannel analyzer, buffer memory, bidirectional cable link, power supplies, and a californium-252 neutron source. A surface support vehicle was designed and outfitted. A minicomputer system was constructed, and software was developed and tested. In Phase II, the system was field tested at several minesites. Tests were performed at sites pertinent to uranium, iron, coal, copper, silver, and gold. Technical feasibility was demonstrated for all these applications except gold; the gold results were inconclusive. In situ neutron activation analysis using high resolution gamma ray spectrometry was found to be a potentially viable logging method for ore grade analysis under certain conditions. [Description provided by NIOSH]
• Subjects:
  Occupational Health Preceptorship Safety
• Keywords:
  Boreholes Design Fabrication Field Tests Neutron Activation Analysis Probes
• Series:
  Mining Publications
• Subseries:
  Open File Report
• Document Type:
  Text
• Genre:
  Conference Publications ; Final Contract Report
• Place as Subject:
  Colorado ; New Jersey ; OSHA Region 2 ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DRC - Denver Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-119
• NIOSHTIC Number:
  nn:10005011
• NTIS Accession Number:
  PB86-150133
• Citation:
  Denver, CO: U.S. Department of the Interior, Bureau of Mines, Contract H0262045, 1984 Jun; :1-119
• Federal Fiscal Year:
  1984
• Performing Organization:
  Princeton Gamma Tech, Inc.
• Peer Reviewed:
  False
• Source Full Name:
  Denver, CO: U.S. Department of the Interior, Bureau of Mines, Contract H0262045
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0a8d64bd556eb2a37628fbf9a2e38618b3063642775c47c051bd12f53f8619e9396df38829247ecfbfa448dea69f3a3add524977063c68d28ed2c0c311721e52
• Download URL:
  https://stacks.cdc.gov/view/cdc/206782/cdc_206782_DS1.pdf
• File Type:
  [PDF - 8.88 MB ]