ASTM WK42043

    Revision of D7759 - 12a Standard Guide for Nuclear Surface Moisture and Density Gauge Calibration

    (What is a Work Item?)

    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; calibration constants; calibration curve; calibration standard; curve fit; gauge; in-place density; nuclear gauge; uncertainty; verification; water content; water mass per unit volume;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    James Pratt


    D18 (14-02)

    Ballot Item Approved as D7759-2014 and Pending Publication