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DTRA’s advancements in nuclear and radiological detection
A new, more complex nuclear age has begun. Echoing the tensions of the Cold War amid rapidly evolving nuclear and radiological threats, preparedness in the modern age is a contest of scientific innovation. The Research and Development Directorate (RD) at the Defense Threat Reduction Agency (DTRA) is charged with winning this contest.
Y.T. Lie, A. Pospieszczyk, J.A. Tagle
Fusion Science and Technology | Volume 6 | Number 2 | September 1984 | Pages 447-452
Technical Paper | Selected papers from the Ninth International Vacuum Congress and the Fifth International Conference on Solid Surfaces (Madrid, Spain, September 26-October 1, 1983) | doi.org/10.13182/FST84-A23220
Articles are hosted by Taylor and Francis Online.
An experiment is described where beams with suitable parameters and elements were produced by ablating thin films of Zr (1000, 3000, 6000 and 10000 Å) and Li + Al (500 A Li, 800 Å Al) with the use of Q-switched ruby laser pulses (total energy density: 12, 5 J/cm2). The energy and density distribution of the evaporated atoms was measured by laser-induced fluorescence. Concerning the particle energy, values of several 10 eV were found with a variation dependent on the film thickness. The beam itself had a half width of about 14° with peak neutral densities between 1010 and 1012 cm−3. In the presence of a hydrogen atmosphere of 10−4 mbar the Zr beam was attenuated by a factor of 2, whereas the density in the Li beam decreased by nearly one order of magnitude.