Patent US3904881A successfully refreshed from Google Patents.
US3904881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutron detector
Assignee: Siemens AG
•
Filing: 1973-08-07
•
Granted: 1975-09-09
•
Expires: 1993-08-07
Abstract
Abstract A self-powered neutron detector for use in the presence of gamma radiation and of the type including a collector, with electrical insulating material separating the collector from an emitter which is not only sensitive to neutron flux but also to gamma radiation so that the electrical output of the detector represents not only a value of the neutron flux as desired, but also of the gamma radiation. To reduce or eliminate this undesirable effect of the gamma radiation, the emitter is made to include an added material having a gamma sensitivity differing from that of the first mentioned material to thereby provide a compensation reducing or eliminating the output of the detector due to the gamma radiation.
Inventors
- 👤 Erich Klar
- 👤 Pierre Haller
- 👤 Ernst Georg Runge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:36
CPC Classifications
G; G01; G01T; G01T3/00; G01T3/006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A self-powered neutron flux detector for use in the presence of gamma radiation and including a neutron-sensitive emitter material which is also sensitive to gamma radiation and which is surrounded by a collector with electrical insulating material between the emitter material and collector; wherein the improvement comprises the addition to said emitter material of at least one other emitter material having a gamma sensitivity differing from that of the first-named material, said two materials being mutually proportioned and arranged to at least reduce the effect of the gamma sensitivity of the first-named material on the output of the detector, and electric circuit connections connecting with said collector and materials.
Claim 2
Dependent Claim
109 words
A self-powered neutron flux detector for use in the presence of gamma radiation and including a neutron-sensitive emitter material which is also sensitive to gamma radiation and which is surrounded by a collector with electrical insulating material between the emitter material and collector; wherein the improvement comprises the addition to said emitter material of at least one other emitter material having a gamma sensitivity differing from that of the first-named material, said two materials being mutually proportioned and arranged to at least reduce the effect of the gamma sensitivity of the first-named material on the output of the detector, and electric circuit connections connecting with said collector and materials.
Claim 3
Dependent Claim
16 words
The detector of claim 1 in which said added material is substantially insensitive to neutron flux.
Claim 4
Dependent Claim
16 words
The detector of claim 2 in which both said materials have substantially the same atomic numbers.
Claim 5
Dependent Claim
58 words
The detector of claim 3 in which said materials are in the form of elongated attenuated shapes arranged parallel to each other and said collector is cylindrical and extends longitudinally with respect to said shapes, said connections connecting individually with said collector and each of said shapes to permit connections with the input of an electric differential amplifier.
Claim 6
Dependent Claim
28 words
The detector of claim 1 in which said materials are electrically and mechanically interconnected and said added material is of opposite polarity with respect to the first-named material.
Claim 7
Dependent Claim
22 words
The detector of claim 5 in which said materials form an emitter unit throughout which the two respective materials are uniformly distributed.
Claim 8
Dependent Claim
36 words
The detector of claim 6 in which said emitter unit is in the form of a rod formed by sections of said materials and said collector is substantially cylindrical and surrounds said rod substantially coaxially therewith.
Claim 9
Dependent Claim
36 words
The detector of claim 6 in which said materials are respectively formed as strands which are helically intertwisted to form an elongated shape and said collector is substantially cylindrical and surrounds said shape substantially coaxially therewith.
Claim 10
Dependent Claim
26 words
The detector of claim 6 in which said materials are in the form of powder particles which are intermixed and enclosed by an electrically insulating tube.
Claim 11
Dependent Claim
23 words
The detector of claim 9 in which said electrical connections include an electrically conductive strand extending through said intermixed particles in said tube.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |