Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

A borehole probe for in situ neutron activation analysis.

Authors
Baicker-JA; Lister-DB; Marr-RE; Goldman-LH
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, Contract H0262045, 1984 Jun; :1-119
Link
NIOSHTIC No.
10005011
Abstract
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.
Keywords
Boreholes; Probes; Design; Fabrication; Neutron activation analysis; Field tests
Publication Date
19840601
Document Type
CP; Final Contract Report
Fiscal Year
1984
NTIS Accession No.
PB86-150133
NTIS Price
A07
Identifying No.
OFR 132-85; Contract-H0262045
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, Contract H0262045
State
CO; NJ
Performing Organization
Princeton Gamma Tech, Inc.
TOP