Patent US3842285A successfully refreshed from Google Patents.
US3842285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and a device for the mechanical modulation of a particle flux
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
•
Filing: 1973-05-11
•
Granted: 1974-10-15
•
Expires: 1993-05-11
Abstract
Abstract A plate which carries particle-emitting sources and non-emitting dummy sources arranged in alternate and uniformly spaced relation is driven in rotation so as to transfer the sources periodically and in alternate sequence in front of a location at which a modulated flux is received such as the measuring cell of a gammaabsorption content meter. The non-emitting material which constitutes the dummy sources has a composition and density such that inhomogenities are created during the movement of said sources and are of the same type as those produced by the emitting sources but relatively displaced by one half-period.
Inventors
- 👤 J Edeline
- 👤 J Lavergne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:56
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/17; G01T1/178
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A method of mechanical modulation of a particle flux, comprising the steps of causing particle-emitting sources and non-emitting sources or dummy sources to move past periodically and in alternate sequence in front of the location receiving a modulated flux, and creating inhomgeneities by said dummy sources during the movement of said sources of the same type as those produced by said emitting sources but relatively displaced by one half-period.
Claim 2
Independent Claim
69 words
A method of mechanical modulation of a particle flux, comprising the steps of causing particle-emitting sources and non-emitting sources or dummy sources to move past periodically and in alternate sequence in front of the location receiving a modulated flux, and creating inhomgeneities by said dummy sources during the movement of said sources of the same type as those produced by said emitting sources but relatively displaced by one half-period.
Claim 3
Independent Claim
80 words
A device for mechanical modulation of particle flux comprising a plate carrying particle sources and dummy sources arranged in alternate and uniformly spaced relation and means for driving said plate so as to displace said sources periodically and in alternate sequence in front of the location to receive a modulated flux, said dummy sources creating inhomogeneities in the physical properties of said plate of the same type as those produced by said particle sources but relatively displaced by one half-period.
Claim 4
Independent Claim
80 words
A device for mechanical modulation of particle flux comprising a plate carrying particle sources and dummy sources arranged in alternate and uniformly spaced relation and means for driving said plate so as to displace said sources periodically and in alternate sequence in front of the location to receive a modulated flux, said dummy sources creating inhomogeneities in the physical properties of said plate of the same type as those produced by said particle sources but relatively displaced by one half-period.
Claim 5
Dependent Claim
155 words
A device according to claim 2 as employed in a gamma-absorption content meter, comprising a measuring cell in which is circulated a solution having a concentration of heavy elements to be measured and containing spurious gamma-ray emitters, said cell being inserted within a stationary plate of heavy metal, a solid disc parallel to said plate and coupled to a driving shaft fixed at the center of said disc, at least one pair of sources carried by said disc at an equal distance from its center, each pair including a gamma-radiation emitting source and a source which has the same shape but is non-emitting, the different sources being angularly spaced at uniform intervals and a drive unit for rotating said shaft at a uniform speed, the relative positions of the various elements of the content meter being such that the different sources pass in turn in front of said measuring cell during their movement of rotation.
Claim 6
Dependent Claim
52 words
A device according to claim 3, wherein the solid disc includes four sources angularly displaced by 90*, two diametrically opposite particle sources containing Am241 oxide and two dummy sources identical with said two particle sources but in which the Am241 oxide is replaced by an oxide which does not emit gamma radiation.
Claim 7
Dependent Claim
91 words
A device according to claim 3, wherein said plate of heavy metal includes a recess, a reference gauge in said recess a gamma-ray detector on the other side of said plate with respect to the solid disc and opposite to the periphery of said disc, and a source-detector assembly movable in translational motion in a direction parallel to said plate, said source-detector assembly being located in oppositely-facing relation to said reference gauge in one end position thereof and in oppositely-facing relation to said measuring cell in the other end position thereof.
References Cited (Backward Citations)
US3159748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |