American National Standard N43.8
Classification of Industrial Ionizing Radiation Gauging Devices
This
American National Standard applies to the radiation safety aspects of
gauging devices, commonly called gauges, that use sealed radioactive
sources or x-ray tubes for the determination or control of thickness,
density level, interface location, particle size distribution or
qualitative or quantitative chemical composition. This standard
establishes a system for classification of gauging devices based on
performance specifications relating to radiation safety. In addition to
specific tests for both use conditions and accident conditions,
guidelines for other safety features and considerations are presented.
This standard does not apply to the measurement performance of gauging
devices.
In 1972, the U.S. Atomic Energy Commission identified a
number of areas in the regulatory process for which nuclear standards
were desired. An appeal was made to the Priorities Committee of the
ANSI Nuclear Technical Advisory Board for support and Subcommittee
N43-3.2 was activated under the sponsorship of the National Bureau of
Standards to develop this standard for gauging devices. Work on the
standard was begun in 1973, and the draft proposal was completed in
1976. The standard was ultimately published in 1979 as ANSI N538-1979.
It was also identified as NBS Handbook 129.
This standard establishes a system for classification of gauging
devices, that use sealed radioisotope or x-ray sources, based on
performance specifications relating to radiation safety. In addition to
specific tests for both use conditions and accident conditions,
guidelines for other safety features and considerations are presented.
This standard does not apply to the measurement performance of gauging
devices.
ANSI N538-1979 was submitted to ISO/TC 85 and was merged with a French
national standard to produce ISO 7205-1986, Radionuclide gauges
Gauges designed for permanent installation.
Reaffirmed and Renumbered as ANSI N43.8
In 1985, ANSI N538 was reviewed by ANSI Subcommittee N43.2 and N43. In
1986 it was reaffirmed without change. It was subsequently renumbered
and reissued as ANSI N43.8 and reaffirmed again in 1988.
Revised Standard ANSI/HPS N43.82001
Review
of ANSI N43.8 was undertaken again in 1994. Subcommittee N43.2
identified the need for numerous changes to make it compatible with the
new 10 CFR 20 and other changes in the field. After several review
sessions, a final consensus was reached and the entire document was
converted to the new ANSI style.
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