US3769510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiothermoluminescence dosimeters and materials therefor
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1972-04-27
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Granted: 1973-10-30
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Expires: 1992-04-27
Abstract
Abstract Complex oxide luminescent material consisting of magnesium oxide-silicon dioxide and containing trace amount of terbium or cerium as an activator shows strong thermoluminescence with glow peak at ca. 190*C under excitation by means of electron beam or various radiations and thus is useful as the phosphor for thermoluminescent dosimeter.
Inventors
- 👤 N Kotera
- 👤 S Nishikawa
- 👤 H Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:24
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/10; G01T1/11
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A radiation dosimetry method according to claim 1 wherein a dosimeter essentially consisting of complex oxide radiothermoluminescent material composed of magnesium oxide-silicon oxide with molar ratio of 1 : 0.03 to 1 : 3.0 and activated with terbium and/or cerium in an amount of 10 5 to 3 X 10 2 gram-atom with respect to 1 mole of magnesium oxde is used.
Claim 2
Dependent Claim
35 words
silicon oxide or a silicon compound easily convertible to silicon oxide upon heating, in an amount of from 0.2 to 1.0 moles of silicon oxide with respect to 1 mole of said magnesium oxide, and
Claim 3
Dependent Claim
47 words
terbium or compounds thereof in an amount of 10 3 to 10 2 gram-atom with respect to 1 mole of said magnesium oxide, and heating the thus obtained mixture at a temperature ranging from 1,500* to 1,800*C., in the presence of air for 2 to 10 hours.
Claim 4
Dependent Claim
60 words
A radiation dosimetry method according to claim 1 wherein a dosimeter essentially consisting of complex oxide radiothermoluminescent material composed of magnesium oxide-silicon oxide with molar ratio of 1 : 0.2 to 1 : 1.0 and activated with terbium and/or cerium in an amount of 10 3 to 10 2 gram-atom with respect to 1 mole of magnesium oxide is used.
Claim 5
Dependent Claim
58 words
A radiation dosimetry method according to claim 1 wherein a dosimeter essentially consisting of complex oxide radiothermoluminescent material composed of magnesium oxide-silicon oxide with molar ratio of 1 : 0.3 to 1 : 0.5 and activated with terbium in an amount of 10 3 to 10 2 gram-atom with respect to 1 mole of magnesium oxide is used.
Claim 6
Dependent Claim
53 words
A radiation dosimetry method according to claim 1, wherein a dosimeter essentially consisting of complex oxide radiothermoluminescent material composed of magnesium oxide-silicon oxide with molar ratio of about 0.3 and activated with terbium in an amount of 10 3 to 10 2 gram-atom with respect to 1 mole of magnesium oxide is used.
Claim 7
Dependent Claim
28 words
A radiation dosimetry method according to claim 5, wherein said terbium is in an amount of about 10 3 gram-atom with respect to 1 mole of magnesium oxide.
Claim 8
Dependent Claim
59 words
A radiation dosimetry method which comprises exposing a dosimeter consisting essentially of complex oxide radiothermoluminescent material, composed of magnesium oxide-silicon oxide and activated with terbium and/or cerium to irradiation in an unknown dose and subsequently, measuring the thermoluminescence emitted from said dosimeter upon heating, thereby reading out the dose of said radiation, said radiothermoluminescent material being obtained by mixing:
Claim 9
Dependent Claim
24 words
A radiation dosimetry method according to claim 7, wherein the molar ratio of silicon oxide to magnesium oxide upon mixing is 0.3 to 0.5
Claim 10
Dependent Claim
33 words
A radiation dosimetry method according to claim 7, wherein the molar ratio of silicon oxide to magnesium oxide is about 0.3 and the gram-atomic ratio of terbium to magnesium is about 10 3.
Claim 11
Dependent Claim
49 words
A radiation dosimetry method according to claim 7, wherein after said material is heated from 1,500* to 1,800*C in air for 2 to 10 hours it is then heated again at a temperature ranging from 1,000* to 1,500*C for 1 to 5 hours in an argon or nitrogen atmosphere.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |