US4039808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state ionization chamber of silicon pn-junction type
Assignee: Japan Atomic Energy Agency
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Filing: 1975-11-26
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Granted: 1977-08-02
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Expires: 1995-11-26
Abstract
Abstract An N/P type silicon solar cell is doped with copper and encased in an aluminum sheath to form a probe. A heavy metal foil means is inserted in the probe to accomplish a solid state ionization chamber of silicon PN-junction type.
Inventors
- 👤 Ryuichi Tanaka
- 👤 Satoshi Tajima
- 👤 Akira Usami
- 👤 Mitsutaka Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:43
CPC Classifications
H; H10; H10F; H10F30/00; H10F30/20; H10F30/29; G; G01; G01T; G01T1/00; G01T1/16; G01T1/24; G01T1/244; Y; Y10; Y10S; Y10S136/00; Y10S136/291
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A solid state ionization chamber of silicon PN-junction type for detecting gamma-ray and X-ray radiations, comprising an N/P-type silicon solar cell, said N/P type solar cell being doped with copper for establishing a reduction rate of lifetime of minority carriers in response to gamma-ray and X-ray radiation to improve radiation resistance; and a heavy metal foil positioned adjacent said solar cell for compensating for directional dependence of said solar cell to incident direction of radiation.
Claim 2
Dependent Claim
75 words
A solid state ionization chamber of silicon PN-junction type for detecting gamma-ray and X-ray radiations, comprising an N/P-type silicon solar cell, said N/P type solar cell being doped with copper for establishing a reduction rate of lifetime of minority carriers in response to gamma-ray and X-ray radiation to improve radiation resistance; and a heavy metal foil positioned adjacent said solar cell for compensating for directional dependence of said solar cell to incident direction of radiation.
Claim 3
Dependent Claim
16 words
An ionization chamber according to claim 1, wherein said heavy metal foil is of non-radioactive material.
Claim 4
Dependent Claim
16 words
An ionization chamber according to claim 1, wherein said heavy metal foil is a tin foil.
Claim 5
Dependent Claim
22 words
An ionization chamber according to claim 1, wherein said heavy metal foil is positioned adjacent a major surface of said solar cell.
Claim 6
Dependent Claim
16 words
An ionization chamber according to claim 4, wherein said heavy metal foil is of non-radioactive material.
Claim 7
Dependent Claim
16 words
An ionization chamber according to claim 4, wherein said heavy metal foil is a tin foil.
Claim 8
Dependent Claim
19 words
An ionization chamber according to claim 1, including a cap positioned about said solar cell for shielding against light.
Claim 9
Dependent Claim
14 words
An ionization chamber according to claim 7, wherein said cap is of cylindrical shape.
Claim 10
Dependent Claim
14 words
An ionization chamber according to claim 7, wherein said cap is of oblong shape.
Claim 11
Dependent Claim
39 words
An ionization chamber according to claim 1, including a probe body for supporting said solar cell, and a cap positioned about said solar cell for shielding said solar cell gainst light, said cap being carried by said probe body.
Claim 12
Dependent Claim
34 words
An ionization chamber according to claim 1, wherein said heavy metal foil is positioned adjacent a major surface of said solar cell and extends over less than the total area of said major surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |