Enhancement of measurement accuracy in bulk material analyzer

  • US 5,732,115 A
  • Filed: 06/20/1995
  • Issued: 03/24/1998
  • Est. Priority Date: 07/09/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. A bulk material analyzer in which bulk material is received in an activation region between at least one neutron source and at least one gamma-ray detector, comprisinga conveyor belt having upwardly and outwardly extended sides;

  • a container having surfaces defining said activation region, wherein the container surfaces further define a passageway for enabling bulk material to be transported through said activation region on the conveyor belt;

    at least one neutron source disposed within the container beneath the passageway on one side of the activation region for emitting neutrons for bombarding bulk material being transported on the conveyor belt through said activation region to cause gamma-rays to be emitted from said bombarded bulk material;

    at least one gamma-ray detector disposed within the container above the passageway on another side of the activation region opposite from said one side for detecting gamma-rays emitted from said bombarded bulk material;

    a primary neutron moderator disposed about said neutron source(s) for reducing the velocity of said emitted neutrons; and

    a secondary neutron moderator disposed about the primary neutron moderator for further reducing the velocity of said neutrons and further disposed adjacent said one side of the activation region at which the neutron source(s) are disposed, for channeling and reflecting said neutrons into said activation region;

    wherein a lower portion of the passageway-defining surfaces define a trough having upwardly and outwardly extended sides adjacent said activation region for cradling the conveyor belt; and

    wherein the secondary neutron moderator is further disposed adjacent the sides of the trough for channeling and reflecting said neutrons into said activation region.

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