Abstract: An apparatus for bulk ore sorting using gamma activation analysis is disclosed. The apparatus includes a conveyor system that includes one or more conveyor belts, surrounded by one or more radiation shields, to transport ore material along a transport path. A pulsed X-ray radiation source is configured to irradiate ore material at an irradiation region and one or more detectors are configured to detect a gamma radiation output from irradiated ore material at a detection region. The transport path has a bend, located between the irradiation region and the detection region, and about a vertical axis, of at least 45 degrees. The one or more detectors are configured to detect a radiation output from the irradiated ore material at times between X-ray pulses of the pulsed X-ray radiation source irradiating the ore material.

Abstract: The invention provides an antenna having a large area reflector formed of a plurality of conductive slats of carbon fibre re-inforced plastics material having air gaps therebetween. The slats are mounted on a supporting and shaping framework which is of like material. The supporting and shaping framework is carried on a support structure of aluminium and between the aluminium and the support structure and the carbon fibre reinforced plastics material of the supporting and shaping framework is provided the intermediary material (e.g. titanium or stainless steel provided to reduce the effects of electrolytic corrosion.

Abstract: A stabilized ship borne antenna arrangement is provided with an antenna which is stabilized against pitching and rolling motions of the ship on which it is mounted. The antenna is intended to rotate in azimuth about a stabilized vertical axis and it is mounted on a rotatable member which rotates about an unstabilized axis, which is fixed relative to the ship. Linear actuators link the antenna to the rotatable member with the lengths of the actuators being adjusted so as to maintain the vertical axis of the antenna as it rotates. The stabilized portion of the antenna arrangement is relatively light with a low center of gravity.