US3889124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Standard light source utilizing spontaneous radiation
Assignee: Panasonic Holdings Corp
•
Filing: 1973-06-21
•
Granted: 1975-06-10
•
Expires: 1993-06-21
Abstract
Abstract A standard light source utilizing spontaneous radiation made by mixing a fluorescent substance LnVO4:X (wherein Ln is Y or Gd, and X is Dy or Eu) with a radioactive substance containing a radioactive isotope which is less in the degree of temperature variation of the intensity of emitted light and excellent in stability. Particularly when used in a light-receiving device having photomultiplier tubes, the said light source emits light quite similar to that of a thermoluminescent substance such as CaSO4:X (wherein X is Im, Dy, Sm or Mn), LiF or Mg2SiO4:Tb, and is excellent as a calibration high-stability standard light source for use in the above-mentioned light-receiving device.
Inventors
- 👤 Osamu Yamamoto
- 👤 Mutsuo Takenaga
- 👤 Yoshinobu Tsujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:19
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/04; C09K11/08; C09K11/77; C09K11/7766; C09K11/7776
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
A STANDARD LIGHT SOURCE UTILIZING SPONTANEOUS RADIATION WHICH COMPRISES A MIXTURE OF A FLUORESCENT SUBSTANCE INVO4X WHEREIN LN IS SELECTED FROM THE GROUP CONSISTING OF Y AND GD, AND X IS SELECTED FROM THE GROUP CONSISTING OF DY AND EU AND, A RADIOACTIVE SUBSTANCE CONTAINING A RADIOACTIVE ISOTOPE.
Claim 2
Dependent Claim
48 words
A STANDARD LIGHT SOURCE UTILIZING SPONTANEOUS RADIATION WHICH COMPRISES A MIXTURE OF A FLUORESCENT SUBSTANCE INVO4X WHEREIN LN IS SELECTED FROM THE GROUP CONSISTING OF Y AND GD, AND X IS SELECTED FROM THE GROUP CONSISTING OF DY AND EU AND, A RADIOACTIVE SUBSTANCE CONTAINING A RADIOACTIVE ISOTOPE.
Claim 3
Dependent Claim
31 words
A spontaneous radiation standard light source according to claim 1, wherein the radioactive substance containing a radioactive isotope is one member selected from the group consisting of Ba14CO3, 90SrTiO3 and 241Am2O3.
Claim 4
Dependent Claim
69 words
A spontaneous radiation standard light source which comprises a solid article prepared from a mixture of a fluorescent substance LnVO4:X wherein Ln is selected from the group consisting of Y and Gd, and X is selected from the group consisting of Dy and Eu, a radioactive substance containing a radioactive isotope, and a binder; and a transparent base plate onto which the said solid article has been firmly adhered.
Claim 5
Dependent Claim
69 words
A spontaneous radiation standard light source which comprises a solid article prepared from a mixture of a fluorescent substance LnVO4:X wherein Ln is selected from the group consisting of Y and Gd, and X is selected from the group consisting of Dy and Eu, a radioactive substance containing a radioactive isotope, and a binder; and a transparent base plate onto which the said solid article has been firmly adhered.
Claim 6
Dependent Claim
49 words
A spontaneous radiation standard light source according to claim 3, wherein the solid article comprises a glass plate placed on the surface of the solid article, a substrate supporting the transparent base plate, and an outer casing externally covering the peripheries of said solid article, substrate and glass plate.
References Cited (Backward Citations)
US3701900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |