US3637518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphor for thermoluminescent radiation dosimeter
Assignee: Panasonic Holdings Corp
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Filing: 1968-03-01
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Granted: 1972-01-25
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Expires: 1988-03-01
Abstract
Abstract A phosphor for a thermoluminescent radiation dosimeter, which is composed primarily of beryllium oxide doped with at least one activator selected from the group consisting of lithium, sodium, potassium, silicon, germanium, tin, zinc, cadmium, aluminum, thallium, cadmium and ytterbium, and which is especially adapted for measuring the dose absorbed by a tissue as its effective atomic number is approximately the same as that of the tissue, and has an excellent sensitivity and retention of radiation energy absorbed.
Inventors
- 👤 Naohiro Nada
- 👤 Tadaoki Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:07
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805; C04; C04B; C04B35/00; C04B35/01; C04B35/08; C04B35/622; C04B35/64; C04B35/645; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3203; C04B2235/3217; C04B2235/3284; C04B2235/3287; C04B2235/34; C04B2235/3418; C04B2235/36; C04B2235/44; C04B2235/442; C04B2235/443; C04B2235/444; C04B2235/448; C04B2235/70; C04B2235/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
34 words
A phosphor for a thermoluminescent radiation dosimeter, consisting primarily of beryllium oxide doped with 0.005 to 0.5 mol percent of at least one activator selected from the group consisting of lithium, sodium and potassium.
Claim 2
Dependent Claim
96 words
A process for the production of the phosphor for a thermoluminescent radiation dosimeter claimed in claim 1, comprising mixing at least one material selected from the group consisting of beryllium oxide and beryllium sulfate with at least one activator selected from the group consisting of lithium, sodium and potassium and the oxides, hydroxides, nitrates, sulfates, carbonates and chlorides thereof and at least one activator selected from the group consisting of silicon oxide and germanium oxide, shaping said mixture by press molding, sintering the mixture at a temperature of 1,500* to 2,100* C. in an oxidizing atmosphere.
Claim 3
Dependent Claim
80 words
A process for the production of the phosphor for a thermoluminescent radiation dosimeter claimed in claim 2, comprising mixing at least one member selected from the group consisting of beryllium oxide and beryllium sulfate with at least one activator selected from the group consisting of lithium, sodium, potassium, and the oxides, hydroxides, nitrates, sulfates, carbonates and chlorides thereof, shaping said mixture by press molding, sintering the mixture at a temperature of 1, 500* to 2,100* C. in an oxidizing atmosphere.
Claim 4
Dependent Claim
77 words
A process for the production of a phosphor for a thermoluminescent radiation dosimeter, which comprises mixing a material beryllium oxide with at least one activator selected from the group consisting of lithium, sodium, potassium, and the oxides, hydroxides, nitrates, sulfates, carbonates and chlorides thereof, shaping said mixture by press molding, sintering the mixture at a temperature of 1,500* to 2,100* C. in an oxidizing atmosphere and coating the surfaces of the resultant shaped phosphor with a glass.
Claim 5
Dependent Claim
69 words
A process for the production of a phosphor for a thermoluminescent radiation dosimeter, which comprises mixing a material beryllium oxide with at least one activator selected from the group consisting of silicon oxide and germanium oxide, shaping said mixture by press molding, sintering the mixture at a temperature of 1,500* to 2,100* C. in an oxidizing atmosphere and coating the surfaces of the resultant shaped phosphor with a glass.
Claim 6
Independent Claim
74 words
A method for producing a thermoluminescent radiation dosimeter phosphor comprising: mixing at least one material selected from the group consisting of beryllium oxide and beryllium sulfate with at least one member selected from the group consisting of materials which provide either lithium, sodium, potassium, silicon, germanium, tin, zinc, cadmium, aluminum, thallium, vaNadium or ytterbium as activator, shaping said mixture by press molding, and thereafter sintering the mixture at a temperature of 1,500* to 2,100*C.
Claim 7
Dependent Claim
78 words
A process for producing a thermoluminescent radiation dosimeter phosphor comprising: mixing at least one material selected from the group consisting of beryllium oxide and beryllium sulfate with at least one activating material selected from those which provides either lithium, sodium, potassium, silicon, germanium, tin, zinc, cadmium, aluminum, thallium, vanadium or ytterbium, sintering the mixture at a temperature of 1,500*-2,100* C. in an oxidizing atmosphere, shaping thus sintered product by press molding and coating the molded product with glass.
Claim 8
Dependent Claim
76 words
A process for producing a thermoluminescent radiation dosimeter phosphor comprising: mixing at least one material selected from the group consisting of beryllium oxide and beryllium sulfate with at least one activating material selected from those which provides either lithium, sodium, potassium, silicon, germanium, tin, zinc, cadmium, aluminum, thallium, vanadium or ytterbium, sintering the mixture at a temperature of 1,500*-2,100* C. in an oxidizing atmosphere and shaping and solidifying thus sintered product with a binder of glass.
References Cited (Backward Citations)
US3463664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |