Article irradiation system with multiple beam paths

• US 6,753,535 B2
• Filed: 05/06/2003
• Issued: 06/22/2004
• 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:
  US10/429,706
• Publication Number:
  US 20030201400A1
• Time in Patent Office: 413 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; and

a conveyor system for transporting articles through the beam path, where the conveyor system has an entrainment conveyor adjacent to a beam pass conveyor and 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 pass conveyor and faster entrainment conveyor causes the articles to contact one another and upon contact, the articles to slow down but to continue to move forward so that there are no gaps between articles on the beam pass conveyor.

2. The irradiation system of claim 1 where the beam pass conveyor comprises a flat top chain for bearing articles.

3. The irradiation system of claim 1 where said articles are totes that contain product to be irradiated.

4. The irradiation system of claim 1 where said articles are trays that contain product to be irradiated.

5. The irradiation system of claim 1 where the beam pass conveyor comprises two parallel stainless steel extended pin chains for capturing and bearing totes and/or trays.

8. The irradiation system of any one of claims 1, 6 and 7 where the beam pass conveyor transports articles through the beam path on a continuous chain.

9. The irradiation system of any one of claims 1, 6 and 7 where the entrainment conveyor comprises a roller flight chain containing high rollers.

10. The irradiation system of any one of claims 1, 6 and 7 further comprising an active rotation device for rotating articles.

6. An irradiation system comprising:

a radiation source having at least one beam path;

a conveyor system for transporting articles through the beam path, where the conveyor system has an entrainment conveyor adjacent to a beam pass conveyor and 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 pass conveyor and faster entrainment conveyor causes the articles to contact one another and, upon contact, the articles to slow down but continue to move forward; and

a gap fault switch linked to the irradiation source where the gap fault switch senses gaps between adjacent articles as a function of time and signals the radiation source to shut off for a time corresponding to the time between adjacent articles.

11. The irradiation system of any one of claims 6 and 7 where the entrainment conveyor positions articles on the beam pass conveyor so there are no gaps between articles on the beam pass conveyor.

7. An irradiation system comprising:

a radiation source having at least one beam path;

a conveyor system for transporting articles through the beam path, where the conveyor system has an entrainment conveyor adjacent to a beam pass conveyor and 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 pass conveyor and faster entrainment conveyor causes the articles to contact one another and, upon contact, the articles to slow down but continue to move forward; and

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.