ASTM WK42043      Work Item: ASTM WK42043 - Revision of D7759 -
12a Standard Guide for Nuclear Surface Moisture and Density
Gauge Calibration      (What is a Work Item?)      Active
Standard: D7759 - 12a      Developed by Subcommittee: D18.08 |
Committee D18 | Contact Staff Manager      1. Rationale
First, a recommendation was made to omit the definition of
source rod from the Terminology section to the Apparatus section
and expand upon a more generic definition of a Probe that can
contain a radioactive source, a detector, or both. Second,
Sections 12.8 and 13.4 pertain to the calibration blocks that
have non-zero water mass per unit volumes assigned to them,
where allowing a 5% tolerance makes sense. For an intrinsic
standard like the zero water content standard that is often used
in gauge water system calibrations, a 5% tolerance does not make
sense, since 5% of zero is still zero. Sections 12.8 and 13.4,
therefore, were modified to account for this inconsistency.
calibration; calibration block;