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US4345111A
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US
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Electric conducting cable insensitive to nuclear radiation
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1980-07-11
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Granted: 1982-08-17
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Expires: 2000-07-11
Abstract
Abstract Electrical conducting cable which is insensitive to nuclear radiation comprising at least one conductive core, at least one layer of an insulating substance surrounding said conductive core and at least one conductive sheath surrounding said insulating layer, wherein the diameter φ D of the sheath, the diameter φ B of the conductive core, the diameter of φ C of the insulating layer are linked by the equation: ##EQU1## F 1 representing the β - radiation fraction from the core reaching the sheath, F 2 representing the β - radiation fraction from the sheath which reaches the core, the insulating substance being constituted by a mixture of at least two metal oxides.
Inventors
- 👤 Hubert Petitcolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:52
CPC Classifications
G; G01; G01T; G01T3/00; G01T3/006; H; H01; H01B; H01B11/00; H01B11/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
An electrical conducting cable which is insensitive to nuclear radiation comprising at least one electrically conductive core, at least one layer of an electrically insulating substance surrounding said conductive core and at least one electrically conductive sheath surrounding said insulating layer, wherein the diameter φ D of the sheath, the diameter φ B of the conductive core, the diameter of φ C of the insulating layer are linked by the equation: ##EQU13## F 1 representing the β - radiation fraction from the core which reaches the sheath, F 2 representing the β - radiation fraction from the sheath which reaches the core, the insulating substance being constituted by a mixture of at least two metal oxides.
Claim 2
Dependent Claim
116 words
An electrical conducting cable which is insensitive to nuclear radiation comprising at least one electrically conductive core, at least one layer of an electrically insulating substance surrounding said conductive core and at least one electrically conductive sheath surrounding said insulating layer, wherein the diameter φ D of the sheath, the diameter φ B of the conductive core, the diameter of φ C of the insulating layer are linked by the equation: ##EQU13## F 1 representing the β - radiation fraction from the core which reaches the sheath, F 2 representing the β - radiation fraction from the sheath which reaches the core, the insulating substance being constituted by a mixture of at least two metal oxides.
Claim 3
Dependent Claim
35 words
A cable according to claim 1, wherein the sheath and core are made from at least one metal having an atomic number which is below or equal to 40 and a low neutron absorption cross-section.
Claim 4
Dependent Claim
46 words
A cable according to claims 1 or 2, wherein at least one of the metal oxides constituting the insulating layer has a low atomic number than the sheath and the core, whilst at least the other has a higher atomic number than the sheath and core.
Claim 5
Dependent Claim
16 words
A cable according to claim 3, wherein the insulating substance has a low neutron absorption cross-section.
Claim 6
Dependent Claim
21 words
A cable according to claim 4, wherein the sheath and core are made from stainless steel with a low manganese content.
Claim 7
Dependent Claim
32 words
A cable according to claim 1, wherein the insulating substance is made from two metal oxides selected from the following: MgO, Al 2 O 3 , BeO, SrO, NbO, ZrO 2 .
Claim 8
Dependent Claim
20 words
A cable according to claim 6, wherein a zirconium oversheathing layer is placed between the core and the insulating layer.
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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |