Calibration Standards for Nuclear Gages (Density Standards)

摘要

The background of calibration research for nuclear soil density gages is summarized. The physical and mineral descriptions of the master density reference standards developed by the California Division of Highways are presented. Fabrication and testing details are discussed; and test data from three gages of different manufacture on the standards are given. It is concluded that it is practical to fabricate density standards, and that the calibration curve developed on them can be used for most common California soils. The use of the master standards, and supplementary standards in the districts, is expected to increase the uniformity and accuracy of calibration of the nuclear instruments. (BPR abstract)