BS 5411-12:1981

National foreword
Cooperating organizations
Methods
1 Scope and field of application
2 Definitions
3 Principle
4 Instrumentation
5 Factors relating to accuracy
6 Calibration of instruments
7 Measuring procedure
8 Measuring accuracy and precision
9 Test report
Annexes
A Isotopes used with beta backscatter gauges
B Atomic numbers of some commonly used coatings and
   substrates
C Saturation thickness as a function of density for
   various isotopes
Figure
1 Typical normalized backscatter curve

Defines a procedure for the non-destructive measurement of coating thicknesses using beta backscatter gauges. Relates to both metallic and non-metallic coatings on both metallic and non-metallic substrates. To use this method, the atomic numbers or equivalent atomic numbers of the coating and the substrate must differ by an appropriate amount. Includes references to definitions, principle, instrumentation, factors relating to accuracy, calibration of instruments, measuring procedure, measuring accuracy and precision, test report, isotopes used with beta backscatter gauges, atomic numbers of some commonly used coatings and substrates and saturation thickness. BS AMD 8490 RENUMBERS THIS STANDARD TO BS EN ISO 3543