Abrading – Machine – Sandblast
Patent
1994-09-28
1997-02-11
Kisliuk, Bruce M.
Abrading
Machine
Sandblast
451322, 451 88, B24C 900
Patent
active
056014791
ABSTRACT:
A method and apparatus for decontaminating structures which utilizes abrasive blasting in conjunction with a reverse air flow to remove contaminants from a structure. The apparatus comprises an abrasive blasting device for projecting abrasive material through a nozzle onto a structure at a high velocity. An enclosure is connected to the blasting device which surrounds the nozzle and forms a vacuum envelope around the nozzle and a portion of the structure being decontaminated. A vacuum apparatus is connected to the enclosure for providing a reverse air flow from the enclosure to a collection chamber in the vacuum. A high pressure pump/motor assembly delivers abrasion material at high pressure from a hopper to the blasting device. As contaminants are abraded from the structure, the reverse air flow provided to the enclosure causes the abrasive material and the material abraded from the structure to be collected in the collection chamber. A radiation detecting device which measures neutron activity is located in the collection chamber. The radiation detection device is electrically coupled to a decade meter which measures the rate of increase of neutron activity in the collection chamber. When the rate of increase of neutron activity exceeds a preselected threshold level, a poison injection device injects a poison into the chamber which decreases neutron activity and a warning signal is provided to the operator.
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The Kelly Decontamination System, 1987.
Banks Derris
Kisliuk Bruce M.
Santos Daniel J.
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