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US3567922A
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US
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Thermoluminescent dosimeter and method
Assignee: Revvity Inc
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Filing: 1968-07-01
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Granted: 1971-03-02
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Expires: 1988-07-01
Abstract
Abstract Thermoluminescent dosimeter and method of making the same including compressing thermoluminescent material under high pressure and at an elevated temperature while flushing the same with a dry inert gas thus forming the thermoluminescent material into a solid that may be sliced into dosimeter wafers. The process also activates coprecipitated calcium fluoride and manganous fluoride.
Inventors
- 👤 Gerald E Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:08
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/10; G01T1/11; Y; Y10; Y10T; Y10T428/00; Y10T428/21
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A thermoluminescent dosimeter formed according to the procedure of claim 1.
Claim 2
Independent Claim
123 words
The method of making thermoluminescent material comprising the steps of: flushing a quantity of material consisting of coprecipitated calcium fluoride and manganous fluoride initially with a dry inert gas for a period of about 10 minutes to remove absorbed gases and other impurities; preheating the coprecipitated material to a temperature of about 300*C while continuing flushing to remove more of the gases; hot pressing the coprecipitated material at an elevated temperature of between about 700*C and 900*C for about 15 minutes and at a pressure ranging between about 30,000 and 125, 000 pounds per square inch while continuing the flushing, the pressure being maintained for about 5 minutes; and discontinuing the flushing while permitting the resulting thermoluminescent material to cool to room temperature.
Claim 3
Dependent Claim
34 words
The method of claim 5 including the additional step of slicing the resulting thermoluminescent material into a plurality of thermoluminescent dosimeters each having a thickness ranging from 30 to 50 thousands of an inch.
Claim 4
Dependent Claim
11 words
A thermoluminescent dosimeter formed according to the method of claim 4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |