Abstract: An electrodynamic force generator or vibrator employing plural ring permanent magnets and a round magnetic structure of the center gap type that is split on a horizontal plane passing through the center and a support and guidance system for supporting the vibratory table and coil consisting of a plurality of horizontal damped cantilever springs joined to "C" shaped damped compensating springs. Typically, a round drive coil of plural turns surrounds a central core or pole of the magnetic structure and is influenced by flux on all sides. Shorted turn coils surround the drive coil and are stationary upon the outer pole to provide reduction of inductance. The drive coil is attached to a table structure which is supported and guided in the magnet structure.

Abstract: A radiopharmaceutical for use on animals including human beings comprises a metal chelate in which the chelating agent is a phenolic amino carboxylic acid or an alkali salt thereof, and the metal is a pharmaceutically acceptable radio isotope such as technetium-99m. The chelating agent may be advantageously an ethylenediamine carboxylic acid or its salt having a phenolic group at each end of the molecule such as EDDHA and HBED or alternatively the phenolic amino carboxylic acid or its salt may have a single phenolate group such as HBG or HBS. The pharmaceutical has a balance of lipo-solubility and water-solubility to permit hepato-biliary imaging.