Abstract
The uae of nuolear depth instrumenta some serious problmsrelated to the atandardization and oalibration of the equipmemo Aa tentative solutiona for lome of these problems,teohniquo for the oonstruotion and measurement of eecondar;laboratory atandarda and a preli.minary aalibration proce-dure for both mou ture and deiislty gages ie propoaedo