Article irradiation system with multiple beam paths

• US 6,770,891 B2
• Filed: 05/06/2003
• Issued: 08/03/2004
• Est. Priority Date: 11/16/2001
• Status: Expired due to Fees

• Current Assignee: Ion Beam Applications s.a.
• Original Assignee: Ion Beam Applications s.a.
• Inventors: Rose, Graham Thomas
• Primary Examiner(s): Lee, John R.
• Assistant Examiner(s): Gurzo, Paul M.
• Application Number:
  US10/429,707
• Publication Number:
  US 20030201401A1
• Time in Patent Office: 455 Days
• Field of Search: 250/453.11, 250/454.11, 250/455.11, 378/64, 378/68, 378/69
• US Class Current: 250/453.11
• CPC Class Codes: G21K 5/10 with provision for relative movement of beam source and object to be irradiated

Abstract

A system for irradiating articles is disclosed. The system has multiple beam paths and is capable of irradiating articles with x-rays or electron beams (e-beams). The system is comprised of a single radiation source producing multiple beam paths. At least one of the beam paths is configured to irradiate articles with x-rays and at least one other beam path is configured to irradiate articles with e-beams. The beam paths are each positioned to scan product carried on conveyors. The x-ray beam paths and e-beam have separate conveyor systems that operates independently from each other.

Claims

1. An irradiation system comprising:

a radiation source having at least one beam path;

a plurality of totes for carrying articles;

a conveyor system for transporting the totes through the beam path, where the conveyor system has a process loop to transport totes through the beam path a plurality of times;

a tote stacker in the process loop for stacking totes one on top of the other prior to transporting through the beam path; and

a tote destacker in the process loop for separating stacked totes after transporting through the beam path,

whereby totes can be stacked, transported through the beam path, unstacked, inversely stacked, and transported through the beam path again.

2. The irradiation system of claim 1 where the process loop further comprises a turntable for rotating totes.

3. The irradiation system of claim 2 the process loop further comprises an entrainment conveyor adjacent to a beam pass conveyor, where the entrainment conveyor precedes the beam pass conveyor and travels at a faster rate of speed than the beam pass conveyor and where the combination of the slower beam sass conveyor and the faster entrainment conveyor causes totes to contact one another and, upon contact, said totes to slow down but to continue to move forward”

.

4. The irradiation system of claim 3 where the beam pass conveyor further comprises a flat top chain.

5. The irradiation system of claim 4 where the entrainment conveyor further comprises a roller flight chain containing high rollers.

6. The irradiation system of claim 5 further comprising a control device for adjusting beam strength in response to changes in speed of the beam pass conveyor so that consistent dose delivery is achieved.

7. The irradiation system of claim 6 where the entrainment conveyor positions articles on the beam pass conveyor so there are no gaps between articles on the beam pass conveyor.