Coal Industry (patents) Limited

Ian Adsley

John S Wykes

Gerard M Croke

Piotr M Surzyn

The proportion of a radioactive material in a moving mass of material is determined with a sensor which derives an output signal proportional to the mass of radioactive material. The output signal is calibrated against known reference values to give a quantitative value of mass. Problems associated with inhomogeneity of material distribution are overcome by averaging the sensed radiation over a time period. Background radiation can be sensed to determine sufficiency of material or it can be shielded from the sensor.

Method for determining the proportion of at least one material in a

A coal/stone mixture transported on a conveyor is investigated by subjecting it to two radiation beams of differing energies. In a preferred embodiment, the higher energy radiation is collimated into a pencil beam and the lower energy radiation into a fan beam. Detector shielding prevents substantial interference of close-to-surface reactions within the detector deriving from the higher energy beam with detection of the lower energy beam.

Method of and apparatus for determining the nature of transported

A sensor which is robust for use in an industrial environment. The sensor employs two scintillation crystals to offer a sufficient crystal volume and the crystals are optically coupled through a silicone rubber compound. The compound also allows the crystals to vibrate independently so that they do not shatter. A single photomultiplier detects scintillation occurring in all the crystals.

Radiation detectors supported by resilient optical coupler

The proportion of a radioactive material in a moving mass of material is determined with a sensor which derives an output signal proportional to the mass of radioactive material. The output signal is calibrated against known reference values to give a quantitative value of mass. The sensor includes a plurality of scintillation crystals. Problems associated with inhomogeneity of material distribution are overcome by averaging the sensed radiation over a time period.

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Branston, United Kingdom

Ian Adsley