A SELF INDICATING MULTI-SENSOR RADIATION DOSIMETER

• US 20090224176A1
• Filed: 10/15/2007
• Published: 09/10/2009
• Est. Priority Date: 10/16/2006
• Status: Abandoned Application

• Current Assignee: JP Laboratories Inc.
• Original Assignee: JP Laboratories Inc.
• Inventors: Patel, Gordhanbhai N.
• Application Number:
  US12/294,148
• Publication Number:
  US 20090224176A1
• Time in Patent Office: Days
• US Class Current: 250/474.100
• CPC Class Codes: G01T 1/04 Chemical dosimeters G01T1/06, G01T1/08 take precedence
• CPC Class Codes: G01T 1/203 the detector being made of plastics

Abstract

Described is a multi-sensor radiation dosimeter system with (1) a self-indicating, instant radiation sensor and (2) a conventional radiation sensor for monitoring high energy radiations, such as X-ray, electrons and neutrons. Conventional radiation sensors, such as X-ray film, TLD (Thermoluminescence Dosimeters), RLG (Radioluminescence Glass) and OSL (Optically Simulated Luminescence), are highly sensitive but are not instant. In the event of a dirty bomb, nuclear detonation or a radiological accident, one needs to know the exposure instantly so proper precautions can be taken and medical treatment, if required, can be given to the victim. If a self-indicating instant sensor is one of the sensors, one would know the dose instantly, and dose can be determined with higher accuracy than by the traditional methods. This type of device offers the best of both technologies.

Claims

1. A multi-sensor radiation dosimeter having at least one self-indicating sensor and at least one accurate sensor.

2. The multi-sensor radiation dosimeter of claim 1 wherein said self indicating sensor and said accurate sensor are sandwiched between two layers.

3. The multi-sensor radiation dosimeter of claim 2 wherein one layer of said two layers is transparent.

4. The multi-sensor radiation dosimeter of claim 2 wherein one layer of said two layers is opaque.

5. The multi-sensor radiation dosimeter of claim 1 further comprising an ambient condition protective layer.

6. The multi-sensor radiation dosimeter of claim 5 wherein said ambient condition is sunlight.

7. The multi-sensor radiation dosimeter of claim 1 wherein said accurate sensor is selected from TLD, OSL, RLG, X-ray film, doped ceramic, plastic and electronic.

8. The multi-sensor radiation dosimeter of claim 1 wherein said self-indicating sensor has an accuracy of at least 80%.

9. The multi-sensor radiation dosimeter of claim 1 wherein said self-indicating has an accuracy which is at least 90%.

10. The multi-sensor radiation dosimeter of claim 1 wherein said accurate sensor is a high accuracy self-indicating sensor.

11. The multi-sensor radiation dosimeter of claim 9 wherein said high accuracy self-indicating sensor has an accuracy which is at least 90%.

12. The multi-sensor radiation dosimeter of claim 1 further having a core layer sandwiched between two layers.

13. The multi-sensor radiation dosimeter of claim 12 wherein said core layer has at least one cavity with at least one of said self indicating sensor and said accurate sensor therein.

14. A process for making a multi-sensor radiation dosimeter of claim 13 comprising forming said at least one cavity by cutting said core layer.

15. A process for making a multi-sensor radiation dosimeter of claim 13 comprising molding said core layer with at least one cavity.

16. The multi-sensor radiation dosimeter of claim 13 wherein said self indicating sensor and said accurate sensor are in said cavity.

17. The multi-sensor radiation dosimeter of claim 1 further comprising a protective layer.

18. The multi-sensor radiation dosimeter of claim 17 wherein said protective layer is selected from PET, PVC, PETG and UV absorbing PET.

19. The multi-sensor radiation dosimeter of claim 1 having at least one indicator for determining false positive or false negative signals.

20. The multi-sensor radiation dosimeter of claim 1 further comprising a temperature indicator.

21. The multi-sensor radiation dosimeter of claim 1 further comprising an indicator for exposure to UV and sunlight.

22. The multi-sensor radiation dosimeter of claim 1 further comprising a shelf life monitor.

23. The multi-sensor radiation dosimeter of claim 1 further comprising at least one indicator selected from a false positive indicator, a false negative indicator, a temperature indicator, a tampering indicator and a shelf life monitor.

24. The multi-sensor radiation dosimeter of claim 1 wherein said accurate sensor is sandwiched between two non-stick layers.

25. The multi-sensor radiation dosimeter of claim 24 wherein said non-stick layer is selected from Teflon and silicone.

26. The multi-sensor radiation dosimeter of claim 1 wherein said accurate sensor is encapsulated.

27. The multi-sensor radiation dosimeter of claim 1 further comprising a bonding layer.

28. The multi-sensor radiation dosimeter of claim 27 wherein said adhesive is a pressure sensitive adhesive.

29. The multi-sensor radiation dosimeter of claim 1 wherein said self indicating sensor comprises at least one conjugated acetylene.

30. The multi-sensor radiation dosimeter of claim 29 wherein said conjugated acetylene is a diacetylene.

31. The multi-sensor radiation dosimeter of claim 30 wherein said diacetylene containing material comprises:

R′

—

C≡

C—

C≡

C—

R″

,

wherein R′ and

R″

are the same or different substituent groups.

32. The multi-sensor radiation dosimeter of claim 31 wherein R′

and R″

are independently selected from (CH₂)_b—

H;

(CH₂)_bOH;

(CH₂)_b—

OCONH—

R1;

(CH₂)_b—

O—

CO—

R1;

(CH₂)_b—

O—

R1;

(CH₂)_b—

COOH;

(CH₂)_b—

COOM;

(CH₂)_b—

NH₂;

(CH₂)_b—

CONHR1;

(CH₂)_b—

NHCOR1;

(CH₂)_b—

CO—

O—

R1;

where b=1-10;

R1 is an aliphatic or aromatic radical, and M is a cation or a mixture thereof.

33. The multi-sensor radiation dosimeter of claim 31 wherein said diacetylene is selected from 2,4-hexadiyne, 2,4-hexadiyn-1,6-diol, 3,5-octadiyn-1,8-diol, 4,6-decadiyn-1,10-diol, 5,7-dodecadiyn-1,12-diol;

diacetylenic fatty acids, pentacosa-10,12-diynoic acid and tricosa-10,12-diynoic acid or a mixture thereof.

34. The multi-sensor radiation dosimeter of claim 31 wherein said diacetylene is selected from urethane derivatives comprising alkyl, aryl, benzyl, methoxy phenyl, alkyl acetoacetate, fluoro phenyl, alkyl phenyl, halo-phenyl, cyclohexyl, toyl and ethoxy phenyl of 2,4-hexadiyn-1,6-diol, 3,5-octadiyn-1,8-diol, 4,6-decadiyn-1,10-diol, and 5,7-dodecadiyn-1,12-diol or a mixture thereof.

35. The multi-sensor radiation dosimeter of claim 31 wherein said diacetylene is selected from derivatives of 2,4-hexadiyn-1,6-diol;

R′

CH₂—

C≡

C—

C≡

C—

CH₂R′

, wherein R′

is selected from —

OCONH(CH₂)₅CH₃, —

OCONH(CH₂)₄—

CH₃, —

OCONH(CH₂)₃CH₃,

—

OCONHCH₂CH₃, —

OCONHCH₃;

R′

″

CH₂—

C≡

C—

C≡

C—

CH₂R′

″

, wherein R′

″

is selected from —

OCO(CH₂)₃CH₃, —

OCOCH₂CH₃, —

OCOCH₃; and

cocrystallized mixtures thereof.

36. The multi-sensor radiation dosimeter of claim 31 wherein said diacetylene is a derivative of one material selected from 3,5-octadiyn-1,8-urethane;

4,6-decadiyn-1,10-urethane and 5,7-dodecadiyn-1,12-urethane.

37. The multi-sensor radiation dosimeter of claim 31 wherein said R′

and R″

are independently selected from —

OCONH(CH₂)₅CH₃;

—

OCONH(CH₂)₄—

CH₃;

—

OCONH(CH₂)₃CH₃;

—

OCONH(CH₂)₂ CH₃;

—

OCONHCH₂CH₃; and

—

OCONHCH₃.

38. The multi-sensor radiation dosimeter of claim 31 wherein said diacetylene is selected from methyl, ethyl, propyl and butyl urethane derivatives of 4,6-decadiyn-1,10-diol.

39. The multi-sensor radiation dosimeter of claim 1 wherein said self-indicating sensor changes color in relation to received dose.

40. The multi-sensor radiation dosimeter of claim 1 wherein said self-indicating sensor changes optical density at a radiation dose of 0.1 to 1,000 rads.

41. The multi-sensor radiation dosimeter of claim 1 wherein said self-indicating sensor further comprises a shelf life extender.

42. The multi-sensor radiation dosimeter of claim 1 wherein said self-indicating sensor further comprises at least one stabilizer selected from the group consisting of heat stabilizer, reactive species quencher, radical scavenger, oxygen scavenger, antioxidant, reactive species inhibitor, reactive species preventor, thermo-oxidative preventor, photo-oxidative preventor, hydroperoxide decomposer, hydrogen donor, metal destabilizer, UB stabilizer, UB absorber, UV reflector, fluorescent and optical brightener.

43. The multi-sensor radiation dosimeter of claim 1 wherein at least one of said self-indicating sensor and said accurate sensor has a dose range of 0.01 rad to 1 megarad.

44. The multi-sensor radiation dosimeter of claim 1 further comprising at least one layer covering at least a portion of said dosimeter.

45. The multi-sensor radiation dosimeter of claim 44 wherein said layer covers said dosimeter.

46. The multi-sensor radiation dosimeter of claim 44 wherein said layer is at least one of removable and liftable.

47. A process for monitoring radiation comprising exposing a multi-sensor radiation dosimeter of claim 44, incidenting a light on said dosimeter and determining dose by monitoring emitted or absorbed light with a detector.

48. The process for monitoring radiation comprising exposing a multi-sensor radiation dosimeter of claim 47 wherein said detector is selected from the group consisting of a photo-detector and a CCD camera.

49. A process for monitoring radiation comprising:

providing a multi-sensor radiation dosimeter of claim 1;

exposing said multi-sensor radiation dosimeter to radiation causing at least one measurable signal on said multi-sensor radiation dosimeter wherein said measurable signal is correlated to said radiation; and

measuring said measurable signal.

50. The process for monitoring radiation of claim 49 further comprising removing said accurate sensor from said multi-sensor radiation dosimeter.

51. The process for monitoring radiation of claim 50 wherein said removing is by die cutting.

52. The process for monitoring radiation of claim 51 wherein said removing is by laser cutting.

53. A process for making a multi-sensor radiation dosimeter of claim 1 comprising lamination of a layer.

54. A process for detecting radiation comprising:

attaching a multi-sensor dosimeter comprising at least one self-indicating sensor and at least one an accurate sensor to an object;

exposing said multi-sensor dosimeter to radiation;

estimating dose immediately by reading said self-indicating sensor; and

determining dose by reading said accurate sensor.

55. The process of detecting radiation of claim 54 wherein said determining dose by said accurate sensor comprises a sensor selected from TLD, OSL, RLG, X-ray film and an electronic detector.

56. The process of detecting radiation of claim 54 further comprising archiving said dose.

57. The process of detecting radiation of claim 54 wherein said self indicating sensor comprises at least one conjugated acetylene.

58. The process of detecting radiation of claim 57 wherein said conjugated acetylene is a diacetylene.

59. The process of detecting radiation of claim 58 wherein said diacetylene comprises:

R′

—

C≡

C—

C≡

C—

R″

,

wherein R′ and

R″

are the same or different substituent groups.

60. The process of detecting radiation of claim 59 wherein R′

and R″

are independently selected from (CH₂)_b—

H;

(CH₂)_bOH;

(CH₂)_b—

OCONH—

R1;

(CH₂)_b—

O—

CO—

R1;

(CH₂)_b—

O—

R1;

(CH₂)_b—

COOH;

(CH₂)_b—

COOM;

(CH₂)_b—

NH₂;

(CH₂)_b—

CONHR1;

(CH₂)_b—

CO—

O—

R1;

where b=1-10;

R1 is an aliphatic or aromatic radical, and M is a cation.

61. The process of detecting radiation of claim 59 wherein said diacetylene is selected from 2,4-hexadiyne, 2,4-hexadiyn-1,6-diol, 3,5-octadiyn-1,8-diol, 4,6-decadiyn-1,10-diol, 5,7-dodecadiyn-1,12-diol and diacetylenic fatty acids, pentacosa-10,12-diynoic acid.

62. The process of detecting radiation of claim 59 wherein said diacetylene is selected from urethane derivatives comprising alkyl, aryl, benzyl, methoxy phenyl, alkyl acetoacetate, fluoro phenyl, alkyl phenyl, halo-phenyl, cyclohexyl, toyl and ethoxy phenyl of 2,4-hexadiyn-1,6-diol, 3,5-octadiyn-1,8-diol, 4,6-decadiyn-1,10-diol, and 5,7-dodecadiyn-1,12-diol.

63. The process of detecting radiation of claim 59 wherein said diacetylene is selected from derivatives of 2,4-hexadiyn-1,6-diol;

R′

CH₂—

C≡

C—

C≡

C—

CH₂R′

, wherein R′

is selected from —

OCONH(CH₂)₅CH₃, —

OCONH(CH₂)₄CH₃, —

OCONH(CH₂)₃CH₃,

—

OCONHCH₂CH₃, —

OCONHCH₃;

R′

″

CH₂—

C≡

C—

C≡

C—

CH₂R′

″

, wherein R′

″

is selected from —

OCO(CH₂)₃CH₃, —

OCOCH₂CH₃, —

OCOCH₃; and

cocrystallized mixtures thereof.

64. The process of detecting radiation of claim 59 wherein said diacetylene is a derivative of one material selected from 3,5-octadiyn-1,8-urethane;

4,6-decadiyn-1,10-urethane and 5,7-dodecadiyn-1,12-urethane.

65. The process of detecting radiation of claim 59 wherein said R′

and R″

are independently selected from —

OCONH(CH₂)₅CH₃;

—

OCONH(CH₂)₄CH₃;

—

OCONH(CH₂)₃CH₃;

—

OCONH(CH₂)₂CH₃;

—

OCONHCH₂CH₃; and

—

OCONHCH₃.

66. The process of detecting radiation of claim 59 wherein said diacetylene is selected from methyl, ethyl, propyl and butyl urethane derivatives of 4,6-decadiyn-1,10-diol.

67. The process of detecting radiation of claim 54 wherein said self-indicating sensor changes color in relation to received dose.

68. The process of detecting radiation of claim 54 wherein said self-indicating sensor changes optical density at a radiation dose of 0.1 to 1,000 rads.

69. The process of detecting radiation of claim 54 wherein said self-indicating sensor further comprises a shelf life extender.

70. The process for detecting radiation of claim 54 wherein said object is a human being.

71. The process of detecting radiation of claim 54 wherein said self-indicating sensor further comprises at least one stabilizer selected from the group consisting of heat stabilizer, reactive species quencher, radical scavenger, oxygen scavenger, antioxidant, reactive species inhibitor, reactive species preventor, thermo-oxidative preventor, photo-oxidative preventor, hydroperoxide decomposer, hydrogen donor, metal destabilizer, UB stabilizer, UB absorber, UV reflector, fluorescent and optical brightener.

72. A multi-sensor radiation dosimeter having at least one self-indicating sensor and at least one accurate sensor sandwiched between two layers wherein one layer of said two layers is transparent.