Evaluation of the DXT calibration used for HMX density measurements in the 1E34 program

A bias existed when a comparison was made between DXT and Quality Control Inline physical density measurements of 1E34 loaded cups. To explain this bias, a study was carried out based on precision measurements of the HMX pressed pellets originally used in 1977 to calibrate the DXT for 1E34 inspection. Results of this study show that the bias was caused by errors in the original determination of the HMX pellet densities. As a result, the DXT was recalibrated in an effort to eliminate the 0.03 g/cm/sup 3/ bias. The recalibration was based on the 1980 measurements used to calculate the physical densities of the HMX pressed pellets. Now, one year later, there are sufficient data generated from actual WR production of 1E34 loaded cups to verify that the recalibration did indeed eliminate the bias.