US3883748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor for thermoluminescent type radiation dosimeter
Assignee: Panasonic Holdings Corp
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Filing: 1973-04-13
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Granted: 1975-05-13
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Expires: 1993-04-13
Abstract
Abstract This has the accumulation effect of radiation energy and is mainly used as the element for thermoluminescent type radiation dosimeter. It has as the principal constituent a phosphor consisting of calcium sulfate as the principal constituent and other impurity elements such as dysprosium, thulium and the like. It is more sensitive by the order of 1-2 or more figures than the conventional ones and is excellent in the retention of absorbed radiation energy.
Inventors
- 👤 Naohiro Nada
- 👤 Tadaoki Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:42
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7713; G; G01; G01T; G01T1/00; G01T1/02; G01T1/10; G01T1/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR MEASURING RADIATION DOSE BY THE THERMOLUMINESCENCE OF CALCIUM SULFATE COMPRISING IRRADIATING A THERMOLUMINESCENT PHOSPHOR CONTAINING CALCIUM SULFATE AS THE PRINCIPAL CONSTITUENT AND AN IMPURITY ELEMENT SELECTED FROM THE GROUP CONSISTING OF DYSPROSIUM, THULIUM, TERBIUM AND PRASEODYMIUM, HEATING SAID IRRADIATED THERMOLUMINESCENT PHOSPHOR TO ABOVE THE MAXIMUM GLOW PEAK TEMPERATURE OF SAID IMPURITY ELEMENT TO EMIT LIGHT, AND MEASURING THE EMITTED LIGHT FROM SAID PHOSPHOR AND DETERMINING THE RADIATION DOSE THEREFROM.
Claim 2
Dependent Claim
72 words
A PROCESS FOR MEASURING RADIATION DOSE BY THE THERMOLUMINESCENCE OF CALCIUM SULFATE COMPRISING IRRADIATING A THERMOLUMINESCENT PHOSPHOR CONTAINING CALCIUM SULFATE AS THE PRINCIPAL CONSTITUENT AND AN IMPURITY ELEMENT SELECTED FROM THE GROUP CONSISTING OF DYSPROSIUM, THULIUM, TERBIUM AND PRASEODYMIUM, HEATING SAID IRRADIATED THERMOLUMINESCENT PHOSPHOR TO ABOVE THE MAXIMUM GLOW PEAK TEMPERATURE OF SAID IMPURITY ELEMENT TO EMIT LIGHT, AND MEASURING THE EMITTED LIGHT FROM SAID PHOSPHOR AND DETERMINING THE RADIATION DOSE THEREFROM.
References Cited (Backward Citations)
US3141973A
Cited
US3485766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |