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Precursor decay in pure LiF has been examined using a laser interferometer technique to measure particle velocity at the rear surface of specimens with thicknesses of about 1.1 and 3.5 mm. For an initial impact stress of about 2.5 GPa (25 kbar), the measured precursors were found to be essentially sharp shocks with rise times on the order 1–2 ns and with amplitudes of 0.25 and 0.24 GPa, respectively. The complete wave profiles measured experimentally have been fit with a characteristic code, employing the method of shock fitting. Good agreement between experimental and calculated results is obtained using a constitutive model based on the nucleation of dislocations at the shock front and subsequent expansion in the form of circular loops.

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mfnnge pnvately owned rights. • Finding shortest paths in a weighted graph model is one way.for a safeguards analyst to locate weaknesses in a.facility's barrier. and alarm system. KSPTH can be used to.rank sabotage paths according to path length so tha~ the K shortest paths can be studied by more detailed methods to see which possess additional properties attractive to an adversary. While emphasizing how to use KSPTH, this report explains the-K-th shortest path algorithm of Hoffman, Pavley and Dreyfus and contains a sample problem, test results and program listings. tcurrentl:v in Nuclear Waste Technology Division.