The anglar dependence of emitted NQR signal intensity from a polycrystalline hexamethylenetetramine has been
investigated. Measurement from the radial direction reveals that the NQR signal from a long column sample showed a
very inhomogeneous radiation pattern which has strong signal along the direction of the excitation and few along the
perpendicular direction from the excitation axis. A series of measurement by a receiver set face to face to the sample at
every 10° from 0° to 350° from the excitation direction revealed that the signal intensity measured has a trigonometric
divergence. This is useful to design an antenna coil of a landmine detector to get strong NQR signal remotely.
We investigated the sensitivity of NQR for explosives such as trinitrotoluene (TNT) and
cyclotrimethylenetrinitramine (RDX), the main constituent of explosives of landmines. We
succeeded in the remote detection of RDX from 8 cm away using NQR.
We have developed a prototype of an NQR landmine detector.
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