Patent US3962586A successfully refreshed from Google Patents.
US3962586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitized thermoluminescent phosphor and method
Assignee: Wisconsin Alumni Research Foundation
•
Filing: 1974-11-13
•
Granted: 1976-06-08
•
Expires: 1994-11-13
Abstract
Abstract A luminescent phosphor for use in radiation dosimetry in which the phosphor is pre-treated by exposure to ultraviolet radiations while simultaneously heating to elevated temperature after the phosphor has first been subjected to radiations in excess of 103 rads.
Inventors
- 👤 Michael R. Mayhugh
- 👤 Gary D. Fullerton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:49
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/10; G01T1/11; C; C09; C09K; C09K11/00; C09K11/08; C09K11/61; C09K11/615; C09K11/616
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
37 words
A thermoluminescent phosphor suitable for use in radiation dosimetry in which the phosphor has been simultaneously exposed to radiations within the range of 750-100 nanometers while heated to elevated temperature with the corresponding elimination of interfering centers.
Claim 2
Dependent Claim
37 words
A thermoluminescent phosphor suitable for use in radiation dosimetry in which the phosphor has been simultaneously exposed to radiations within the range of 750-100 nanometers while heated to elevated temperature with the corresponding elimination of interfering centers.
Claim 3
Dependent Claim
25 words
A thermoluminescent phosphor as claimed in claim 1 in which the radiations to which the phosphor is exposed are in the range of ultraviolet radiations.
Claim 4
Dependent Claim
16 words
A thermoluminescent phosphor as claimed in claim 1 in which the phosphor is a TL phosphor.
Claim 5
Dependent Claim
21 words
A thermoluminescent phosphor as claimed in claim 1 in which the phosphor is one that has or which develops interfering centers.
Claim 6
Dependent Claim
24 words
A thermoluminescent phosphor as claimed in claim 1 wherein the phosphor has been pre-sensitized by exposure to radiations which exceed the onset of supralinearity.
Claim 7
Dependent Claim
29 words
A thermoluminescent phosphor as claimed in claim 5 in which the phosphor is lithium fluoride and in which the phosphor has been pre-exposed to radiations above 10 3 rads.
Claim 8
Dependent Claim
26 words
A thermoluminescent phosphor as claimed in claim 6 in which the phosphor is pre-exposed to radiations within the range of 10 3 - 10 6 rads.
Claim 9
Dependent Claim
24 words
A thermoluminescent phosphor as claimed in claim 1 in which the phosphor is annealed by heating to a temperature which does not exceed 400°C.
Claim 10
Dependent Claim
24 words
A thermoluminescent phosphor in which the phosphor is selected from the group consisting of lithium fluoride and calcium fluoride, with or without doping impurities.
Claim 11
Dependent Claim
24 words
A thermoluminescent phosphor in which the phosphor is selected from the group consisting of lithium fluoride and calcium fluoride, with or without doping impurities.
Claim 12
Dependent Claim
55 words
In the method for pre-sensitizing a thermoluminescent phosphor for use in radiation dosimetry, the steps of annealing the phosphor by heating to elevated temperature simultaneously with exposure of the phosphor to radiations within the range of 750-100 mm for at least a portion of the annealing cycle to eliminate interfering centers present in the phosphor.
Claim 13
Dependent Claim
55 words
In the method for pre-sensitizing a thermoluminescent phosphor for use in radiation dosimetry, the steps of annealing the phosphor by heating to elevated temperature simultaneously with exposure of the phosphor to radiations within the range of 750-100 mm for at least a portion of the annealing cycle to eliminate interfering centers present in the phosphor.
Claim 14
Dependent Claim
29 words
The method as claimed in Claim 10 in which the phosphor is selected from the group consisting of lithium fluoride, calcium fluoride, doped lithium fluoride and doped calcium fluoride.
Claim 15
Dependent Claim
22 words
The method as claimed in Claim 10 in which the phosphor is exposed to ultraviolet radiation during the heating to elevated temperature.
Claim 16
Dependent Claim
18 words
The method as claimed in claim 10 in which the interfering centers are naturally present in the phosphor.
Claim 17
Dependent Claim
21 words
The method as claimed in claim 10 in which the interfering centers are introduced into the phosphor by pre-exposure for sensitization.
Claim 18
Dependent Claim
34 words
The method as claimed in claim 14 in which, when the phosphor is formed of lithium fluoride or a doped lithium fluoride, the phosphor is exposed to radiations above 10 3 rads for pre-sensitization.
Claim 19
Dependent Claim
24 words
The method as claimed in claim 15 in which the phosphor is pre-exposed to radiations above 10 3 rads up to 10 6 rads.
Claim 20
Dependent Claim
37 words
A luminescent phosphor suitable for use in radiation dosimetry in which the phosphor has been simultaneously exposed to radiations within the range of 750-100 nanometers while heated to elevated temperature with the corresponding elimination of interfering centers.
Claim 21
Dependent Claim
37 words
A luminescent phosphor suitable for use in radiation dosimetry in which the phosphor has been simultaneously exposed to radiations within the range of 750-100 nanometers while heated to elevated temperature with the corresponding elimination of interfering centers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |