ASTM E 498 - 95. Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector or Residual Gas Analyzer in the Tracer Probe Mode

American Society for Testing and Materials (ASTM). 1995, 4 pages.
These test methods cover procedures for testing and locating the sources of gas leaking at the rate of 4.5 3 10−14 mol/s (1 3 10−9 Std cm3/s)3 or greater. The test may be conducted on any object to be tested that can be evacuated and to the other side of which helium or other tracer gas may be applied.