Bulk material irradiation system and method

• US 7,067,822 B2
• Filed: 11/21/2003
• Issued: 06/27/2006
• Est. Priority Date: 02/24/2000
• Status: Expired due to Fees

• Current Assignee: Mitec Incorporated
• Original Assignee: Mitec Incorporated
• Inventors: Koenck, Steven E., Lyons, Stan V., White, Douglas C., Dalziel, Brian T., Kewley, Janette J.
• Primary Examiner(s): Wells, Nikita
• Assistant Examiner(s): Johnston, Phillip A.
• Application Number:
  US10/718,754
• Publication Number:
  US 20040113094A1
• Time in Patent Office: 949 Days
• Field of Search: 250/435
• US Class Current: 250/435
• CPC Class Codes: A23L 3/263 with corpuscular or ionising radiation, i.e. X, alpha, beta or omega radiation laser plasma radiation A23L3/26
• CPC Class Codes: G21K 5/10 with provision for relative movement of beam source and object to be irradiated

Abstract

A bulk material irradiation system includes an input for inserting bulk material. A bulk material tube is connected to the input, forming a path for bulk material flow. A pressurizing assembly is connected to the bulk material tube for forcing the bulk material to flow through the bulk material tube. An irradiation assembly provides ionizing radiation to irradiate the bulk material passing adjacent to the irradiation assembly in the bulk material tube. Irradiated bulk material exits the bulk material tube through an output.

Claims

1. A bulk material irradiation system comprising:

an input for inserting bulk material;

a plurality of bulk material tubes each offset from adjacent tubes in an alternating pattern, connected to the input and forming paths for bulk material flow;

a pumping assembly connected to the bulk material tubes for forcing the bulk material to advance through the bulk material tubes;

an irradiation assembly providing ionizing radiation that penetrates a full thickness of the bulk material in the plurality of offset bulk material tubes to irradiate the bulk material passing adjacent to the irradiation assembly in the bulk material tubes; and

an output for irradiated bulk material to exit the bulk material tubes.

4. The bulk material irradiation system of claim 1, wherein the bulk material comprises fresh ground meat.

5. The bulk material irradiation system of claim 4, further comprising a velocity measurement system for determining an actual rate of ground meat movement through the plurality of bulk material tubes and adjusting an irradiation dose provided by the irradiation assembly based on the determined rate.

2. A bulk material irradiation system comprising:

an input for inserting bulk material;

a bulk material tube connected to the input and forming a path for bulk material flow, wherein the bulk material tube is elliptical in shape and has a wall with a thickness that is thicker around edge portions of the bulk material tube than around a central portion of the bulk material tube;

a pumping assembly connected to the bulk material tube for forcing the bulk material to advance through the bulk material tube;

an irradiation assembly providing ionizing radiation that penetrates a full thickness of the bulk material to irradiate the bulk material passing adjacent to the irradiation assembly in the bulk material tube; and

an output for irradiated bulk material to exit the bulk material tube.

6. The bulk material irradiation system of claim 2, wherein the bulk material comprises fresh ground meat.

7. The bulk material irradiation system of claim 6, further comprising a velocity measurement system for determining an actual rate of ground meat movement through the bulk material tube and adjusting an irradiation dose provided by the irradiation assembly based on the determined rate.

3. A bulk material irradiation system comprising:

an input for inserting bulk material;

a bulk material tube connected to the input and forming a path for bulk material flow, wherein the bulk material tube has an outer wall that is rectangular in shape and an inner wall that is elliptical in shape, a region between the outer wall and the inner wall including a liquid with an irradiation absorption characteristic that approximately matches an irradiation absorption characteristic of the bulk material in the bulk material tube;

a pumping assembly connected to the bulk material tube for forcing the bulk material to advance through the bulk material tube;

an irradiation assembly providing ionizing radiation that penetrates a full thickness of the bulk material to irradiate the bulk material passing adjacent to the irradiation assembly in the bulk material tube; and

an output for irradiated bulk material to exit the bulk material tube.

8. The bulk material irradiation system of claim 3, wherein the bulk material comprises fresh ground meat.

9. The bulk material irradiation system of claim 8, further comprising a velocity measurement system for determining an actual rate of ground meat movement through the bulk material tube and adjusting an irradiation dose provided by the irradiation assembly based on the determined rate.