Power system for dosimeter reader

• US 8,552,403 B2
• Filed: 04/08/2011
• Issued: 10/08/2013
• Est. Priority Date: 04/09/2010
• Status: Active Grant

• Current Assignee: Landauer, Inc. (Fortive Corp.)
• Original Assignee: Landauer, Inc. (Fortive Corp.)
• Inventors: Yoder, R. Craig, Akselrod, Mark S., Dillin, Kent J., Fomenko, Vasiliy V., Johnson, David F., Tatsumi, Yoshikazu, Lo, Tse-Min
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): FEIN, ABRA S
• Application Number:
  US13/082,494
• Publication Number:
  US 20120018652A1
• Time in Patent Office: 914 Days
• Field of Search: 250/483.2, 250/484.2, 250/484.5, 248/222.52, 248/225.21
• US Class Current: 250/484.2
• CPC Class Codes: G01T 1/10 Luminescent dosimeters
• CPC Class Codes: G01T 1/105 Read-out devices G01T1/115 takes precedence
• CPC Class Codes: G01T 1/115 Read-out devices

Abstract

Described is a portable dosimeter reader device that is small in size and light in weight. The device comprises an optically stimulated luminescence (OSL) reader for reading one or more OSL sensors of a dosimeter and a dosimeter drawer slidably mounted in the device. The device further comprises an elevator carriage comprising a barrel with a barrel groove on an exterior side thereof, a loop retainer elevator including a tongue on an interior side thereof that travels in the barrel groove, a pinion gear mounted on the barrel, and a rack with rack teeth that engage pinion teeth of the pinion gear.

Claims

1. A device comprising:

an optically stimulated luminescence (OSL) reader for reading one or more OSL sensors of a dosimeter;

a dosimeter drawer slidably mounted in the device, the dosimeter drawer comprising;

a drawer base including two tab openings through which two retaining tabs extend; and

a drawer handle for pushing and pulling the dosimeter drawer so that that drawer slides in a first direction and a second direction that are opposite to each other;

first and second loop retainers extending through respective post openings in the drawer base,

wherein the drawer base includes one or more first engagement structures for engaging one or more second engagement structures on a lower housing of the dosimeter when the dosimeter is loaded in the dosimeter drawer whereby the lower housing is prevented from rotating relative to the drawer base ;

wherein the sliding of the dosimeter drawer in the first direction causes the two retaining tabs engage respective lips and cutouts of recesses on the lower housing of the dosimeter to retain the lower housing of the dosimeter on the drawer base when an upper housing of the dosimeter is separated from the lower housing of the dosimeter,

wherein the first and second loop retaining posts retain respective first and second loops of the upper housing of the dosimeter when the upper housing of the dosimeter is rotated approximately 90°

relative to the lower housing to release the upper housing from the lower housing,

wherein the first and second loop retainers raise the upper housing above the lower housing when the upper housing is retained by the first and second loop retaining posts and when the dosimeter drawer is pushed in the first direction,

wherein the first and second loop retainers lower the upper housing separated from the lower housing on the lower housing when the dosimeter drawer is pulled in the second direction, and

wherein the device further comprises;

an elevator carriage comprising;

a barrel with a barrel groove on an exterior side thereof;

a loop retainer elevator including a tongue on an interior side thereof that travels in the barrel groove; and

a pinion gear mounted on the barrel; and

a rack with rack teeth that engage pinion teeth of the pinion gear,

wherein when the dosimeter drawer is pushed in the first direction, the pinion gear rotates along the rack thereby causing the barrel to rotate and the tongue of the loop retainer elevator to travel in along the barrel groove thereby causing the loop retainer elevator to move upwardly relative to the barrel and first and second loop retainers to raise the upper housing above the lower housing of the dosimeter.

2. The device of claim 1, the one or more first engagement structures comprise a C-shaped ridge and the one or more second engagement structures comprises a C-shaped groove.

3. The device of claim 1, wherein the two retaining tabs are moved outwardly by the device when the dosimeter drawer is pushed from a dosimeter loading/unloading region for the device to a dosimeter ready region for the device.

4. The device of claim 1, wherein the device further comprises a ready region housing that forms a light tight enclosure when the dosimeter drawer is pushed into the reading region housing and wherein a portion of the light tight enclosure comprises a drawer housing of the dosimeter drawer.

5. The device of claim 4, wherein the one or more OSL sensors are mounted in a dosimeter sled that is slidably mounted in the lower housing, wherein the device further comprises:

a sled slider slidably mounted in the device, wherein the sled slider pulls and pushes the dosimeter sled, wherein the sled slider pulls the dosimeter sled out of the lower housing and into a dosimeter reading region of the device, wherein the sled slider moves the dosimeter sled within the dosimeter reading region to a respective reading position for each of the respective one or more OSL sensors, wherein each OSL sensor is read by the OSL reader at the respective reading position for the OSL sensor, and wherein the sled slider pushes the dosimeter sled back into the lower housing after a selected one or more of the one or more OSL sensors are read by the OSL reader.

6. The device of claim 5, wherein the device further comprises a photo-optic sensor that interacts with respective notches aligned with each OSL sensor to determine when each of the one or more OSL sensors is in a respective reading position.

7. The device of claim 5, wherein the sled slider includes a first tang and first U-shaped detent for engaging a second U-shaped detent and a second tang, respectively, of the dosimeter sled, thereby allowing the sled slider to pull the dosimeter sled, and wherein the sled slider includes a pusher end for pushing the dosimeter sled.

8. The device of claim 5, wherein the directions the sled slider pulls and pushes the dosimeter sled are perpendicular to the first and second directions that the dosimeter drawer moves.

9. The device of claim 5, wherein the device further comprises an RFID tag reader for communicating with an RFID tag mounted on the dosimeter sled.

10. The device of claim 9, wherein the RFID tag reader communicates with the RFID tag when the dosimeter sled is in a reading position for one of the OSL sensors.

11. The device of claim 5, wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) mounted in a first cylindrical cup-shaped filter, and wherein the first cylindrical cup-shaped filter comprises a first energy compensating material.

12. The device of claim 11, wherein the first cylindrical cup-shaped filter is comprised of aluminum.

13. The device of claim 11, wherein the first cylindrical cup-shaped filter comprises a plastic having metal particles dispersed therein.

14. The device of claim 11, wherein a first OSL sensor of the one or more OSL sensors comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted.

15. The device of claim 14, wherein the first cylindrical cup-shaped filter comprises aluminum and the second cylindrical cup-shaped filter comprises copper.

16. The device of claim 11, wherein the one or more OSL sensors each comprise one or more filter material discs located between the OSLM and a base of the first cylindrical cup-shaped filter.

17. The device of claim 16, wherein a first OSL sensor of the one or more OSL sensors comprises a converter material disc located between the OSLM and the first cylindrical cup-shaped filter.

18. The device of claim 17, wherein the converter material disc is comprised of high-density polyethylene and wherein there is a conformal disc comprised of polyethylene located between the OSLM and the converter material disc.

19. The device of claim 16, wherein a second OSL sensor of the one or more OSL sensors comprises a reference filter material disc comprised of polytetrafluoroethylene located between the OSLM and the first cylindrical cup-shaped filter.

20. The device of claim 19, wherein the first cylindrical cup-shaped filter is comprised of aluminum.

21. The device of claim 20, wherein OSL sensor further comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted.

22. The device of claim 21, wherein the second cylindrical cup-shaped filter is comprised of copper.