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Description / Abstract:
This test method covers the beta backscatter gages for the
nondestructive measurement of metallic and nonmetallic coatings on
both metallic and nonmetallic substrate materials.
The test method measures the mass of coating per unit area,
which can also be expressed in linear thickness units provided that
the density of the coating is known.
The test method is applicable only if the atomic numbers or
equivalent atomic numbers of the coating and substrate differ by an
appropriate amount (see 6.2).
Beta backscatter instruments employ a number of different
radioactive isotopes. Although the activities of these isotopes are
normally very low, they can present a hazard if handled
incorrectly. This standard does not purport to address the safety
issues and the proper handling of radioactive materials. It is the
responsibility of the user to comply with applicable State and
Federal regulations concerning the handling and use of radioactive
material. Some States require licensing and registration of the
radioactive isotopes.
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.