Scanning Gamma Ray Densitometer System for Detonations.

摘要

The subject of this report is the description of a gamma ray scanning densitometer for measurement of height and density of the explosive increments in loaded detonators and delays. The 317 KEV gamma rays from an Ir192source were collimated into a beam of 0.002by 0.100inch. A scanning system moved the detonators through this beam while the intensity of the transmitted radiation was recorded. On M-55detonators (0.146inch dia x 0.142inch high),heights of explosive increments were measured to an accuracy of plus or minus 0.002inch,and densities of lead azide were measured to plus or minus 3%. With Ir192,density measurements on NOL-130were reproduced to plus or minus 5%,and on RDX to plus or minus 16%. Based on gamma ray absorption theory,it is known that accuracy of RDX measurements will be improved by use of a lower energy gamma ray source. (Author)