Portable dosimeter

• US 8,541,761 B2
• Filed: 04/09/2010
• Issued: 09/24/2013
• Est. Priority Date: 01/12/2010
• Status: Active Grant

• Current Assignee: Landauer, Inc. (Fortive Corp.)
• Original Assignee: Landauer, Inc. (Fortive Corp.)
• Inventors: Yoder, R. Craig, Tatsumi, Yoshikazu, Lo, Tse-Min, Akselrod, Mark S.
• Primary Examiner(s): Hannaher, Constantine
• Application Number:
  US12/757,147
• Publication Number:
  US 20110168922A1
• Time in Patent Office: 1,264 Days
• Field of Search: 250/484.5, 250/484.3, 250/337, 40/15, 24/37
• US Class Current: 250/484.5
• CPC Class Codes: G01T 1/105 Read-out devices G01T1/115 takes precedence
• CPC Class Codes: G01T 3/00 Measuring neutron radiation G01T5/00 takes precedence

Abstract

A radiation dosimeter including one or more optically stimulated luminescence (OSL) sensors.

Claims

1. A device comprising:

a radiation dosimeter including one or more optically stimulated luminescence (OSL) sensors;

a strap member for wrapping around a portion of a body or a portion of an article of clothing to thereby allow the dosimeter to be worn by an individual,

wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) and one or more filters,

wherein the dosimeter includes an upper housing and a lower housing and wherein the upper housing is separable from the lower housing,

wherein the device comprises a sled that is slidably removable from the lower housing and wherein the sled includes the one or more OSL sensors,

wherein the upper housing includes interior screw threads that engage exterior screw threads on the lower housing, and wherein is separable from the lower housing when the upper housing is turned 90°

relative to the lower housing from a position in which the lower housing is mounted in the upper housing, and

wherein each of the OSL sensors comprises the OSLM mounted in a first cylindrical cup-shaped filter.

2. The device of claim 1, wherein the dosimeter includes two loops on opposite sides of the dosimeter through which the strap member is threaded and which are graspable by an individual to thereby allow the individual to turn the upper housing 90°

relative to the lower housing when the lower housing is prevented from rotating.

3. The device of claim 2, wherein the lower housing comprises one or more rotation preventing engagement structures for engaging respective one or more complementary rotation preventing engagement structures of a dosimeter reader to prevent rotation of the lower housing when the lower housing is loaded in the dosimeter reader.

4. The device of claim 1, wherein the first cylindrical cup-shaped filter comprises aluminum.

5. The device of claim 1, wherein a selected one or more OSL sensors of the one or more OSL sensors comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted.

6. The device of claim 5, wherein the first cylindrical cup-shaped filter comprises aluminum and the second cylindrical cup-shaped filter comprises copper.

7. The device of claim 1, 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.

8. The device of claim 7, 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.

9. The device of claim 8, wherein the converter material disc comprises high-density polyethylene and wherein there is a conformal disc comprising polyethylene located between the OSLM and the converter material disc.

10. The device of claim 8, wherein a second OSL sensor of the one or more OSL sensors comprises a first reference filter material disc located between the OSLM and the first cylindrical cup-shaped filter.

11. The device of claim 10, wherein the first reference filter material disc comprises polytetrafluorethylene.

12. The device of claim 11, wherein a third OSL sensor of the one or more OSL sensors comprises a second reference filter material disc, wherein the second reference material disc is located between the OSLM and the first filter, and wherein the third OSL sensor is a comparator sensor for the second OSL sensor.

13. The device of claim 12, wherein the second reference filter material disc comprises polytetrafluorethylene.

14. The device of claim 1, wherein the OSLM for each OSL sensor comprises an Al₂O₃:

C material.

15. A device comprising:

a radiation dosimeter comprising;

a dosimeter sled including one or more optically stimulated luminescence (OSL) sensors;

an upper housing; and

a lower housing,

wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) and one or more filters,

wherein the upper housing includes interior screw threads that engage exterior screw threads on the lower housing,

wherein the upper housing is separable from the lower housing when the upper housing is turned 90°

relative to the lower housing from a position in which the lower housing is mounted in the upper housing,

wherein the dosimeter sled is slidably mounted in the lower housing, and

wherein each of the OSL sensors comprises the OSLM mounted in a first cylindrical cup-shaped filter.

16. The device of claim 15, wherein the upper housing includes two loops on opposite side of the upper housing for threading a strap member through and wherein the loops are graspable by an individual to thereby allow the individual to turn the upper housing 90°

relative to the lower housing when the lower housing is prevented from rotating.

17. The device of claim 15, wherein the lower housing comprises one or more rotation preventing engagement structures for engaging respective one or more complementary rotation preventing engagement structures of a dosimeter reader to prevent rotation of the lower housing when the lower housing is loaded in the dosimeter reader.

18. The device of claim 15, wherein the dosimeter sled that is slidably removable from the lower housing and wherein the dosimeter sled includes the one or more OSL sensors.

19. The device of claim 15, wherein the first cylindrical cup-shaped filter comprises aluminum.

20. The device of claim 15, wherein one or more of the OSL sensors comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted.

21. The device of claim 20, wherein the first cylindrical cup-shaped filter comprises aluminum and the second cylindrical cup-shaped filter comprises copper.

22. The device of claim 15, 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.

23. The device of claim 22, wherein a first OSL sensor of the one or more OSL sensors comprises a converter material disc located between the OSLM and the first filter.

24. The device of claim 23, wherein the converter material disc comprises high-density polyethylene and wherein there is a conformal disc comprising polyethylene located between the OSLM and the converter material disc.

25. The device of claim 22, wherein a second OSL sensor of the one or more OSL sensors comprises a first reference filter material disc located between the OSLM and the first filter.

26. The device of claim 25, wherein the first reference filter material disc comprises polytetrafluorethylene.

27. The device of claim 26, wherein a third OSL sensor of the one or more OSL sensors comprises a second reference filter material disc, wherein the second reference material disc is located between the OSLM and the first filter, and wherein the third OSL sensor is a comparator sensor for the second OSL sensor.

28. The device of claim 27, wherein the second reference filter material disc comprises polytetrafluorethylene.

29. The device of claim 15, wherein the OSLM for each OSL sensor comprises an Al₂O₃:

C material.

30. A device comprising:

a radiation dosimeter including one or more optically stimulated luminescence (OSL) sensors; and

a clip for attachment to a portion of an article of clothing to thereby allow the dosimeter to be worn by an individual,

wherein the one or more of the OSL sensors each comprise an optically stimulated luminescent material (OSLM) and one or more filters,

wherein the dosimeter includes an upper housing and a lower housing and wherein the upper housing is separable from the lower housing,

wherein the device comprises a sled that is slidably removable from the lower housing,

wherein the sled includes the one or more OSL sensors,

wherein the upper housing includes interior screw threads that engage exterior screw threads on the lower housing, and wherein the upper housing is separable from the lower housing when the upper housing is turned 90°

relative to the lower housing from a position in which the lower housing is mounted in the upper housing, and

wherein each of the one or more OSL sensors comprises the OSLM mounted in a first cylindrical cup-shaped filter.

31. The device of claim 30, wherein the dosimeter includes two loops on opposite sides of the dosimeter which are graspable by an individual to thereby allow the individual to turn the upper housing 90°

relative to the lower housing when the lower housing is prevented from rotating and wherein the clip is attached to one of the two loops.

32. The device of claim 30, wherein the lower housing comprises one or more rotation preventing engagement structures for engaging respective one or more complementary rotation preventing engagement structures of a dosimeter reader to prevent rotation of the lower housing when the lower housing is loaded in the dosimeter reader.

33. The device of claim 30, wherein the first cylindrical cup-shaped filter comprises aluminum.

34. The device of claim 30, wherein a selected one or more OSL sensors of the one or more OSL sensors comprises a second cylindrical cup-shaped filter in which the first cylindrical cup-shaped filter is mounted.

35. The device of claim 34, wherein the first cylindrical cup-shaped filter comprises aluminum and the second cylindrical cup-shaped filter comprises copper.

36. The device of claim 35 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.

37. The device of claim 36, wherein a first OSL sensor of the one or more OSL sensors comprises a converter material disc located between the OSLM and the first filter.

38. The device of claim 37, wherein the converter material disc is comprises high-density polyethylene and wherein there is a conformal disc comprises polyethylene located between the OSLM and the converter material disc.

39. The device of claim 38, wherein a second OSL sensor of the one or more OSL sensors comprises a first reference filter material disc located between the OSLM and the first filter.

40. The device of claim 39, wherein the first reference filter material disc comprises polytetrafluorethylene.

41. The device of claim 39, wherein a third OSL sensor of the one or more OSL sensors comprises a second reference filter material disc, wherein the second reference material disc is located between the OSLM and the first filter, and wherein the third OSL sensor is a comparator sensor for the second OSL sensor.

42. The device of claim 41, wherein the second reference filter material disc comprises polytetrafluorethylene.

43. The device of claim 30, wherein the OSLM for each OSL sensor comprises an Al₂O₃:

C material.