US3784823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for the detection of fission products
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
•
Filing: 1972-01-19
•
Granted: 1974-01-08
•
Expires: 1992-01-19
Abstract
Abstract The method consists in carrying out the electrical collection of fission products on both sides of very thin metallized discs of polyester insulating material which are placed at the center of a spherical chamber and in measuring the radioactivity with a set of two electron detectors mounted to detect activity of the discs in all directions. The device for carrying out the method comprises a magazine constituted by a rotary circular ring provided with spaced openings each intended to accommodate a disc, a spherical ioncollection chamber, two parallel semiconductor detectors and a unit for conveying each disc from the magazine into an opening formed in a transfer plate. The disc is transferred by the plate to an ion-collection chamber, then passed between the two detectors in order to measure the activity and energy spectrum of the beta radiation of the collected ions then returned to the magazine.
Inventors
- 👤 S Kostic
- 👤 Meur R Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:08
CPC Classifications
G; G21; G21C; G21C17/00; G21C17/06; G21C17/07; G21C17/02; G21C17/04; G21C17/044; G21C17/045; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
196 words
A device for the detection of fission products, said device comprising: a magazine established by a rotary circular ring having equal and uniformly spaced openings each adapted to contain a very thin disc of insulating material metallized on both faces, a spherical collection chamber, two identical semiconductor electron detectors having a surface area at least equal to that of a disc and mounted in parallel relation at a very short distance from each other, a transfer plate provided with an opening capable of receiving each of said discs in succession, and a conveying unit defining a chamber having a thickness of said discs and movable between said circular ring and said transfer plate, whereby through suitable coordination of transfer plate and conveying unit displacement, one disc is caused to pass from said magazine into the opening of the transfer plate and displaced by said transfer plate to the center of the colleCtion chamber so as to permit collection of the ions, then located between the two detectors in order to permit measurement of the activity and of the energy spectrum of the collected ions and is then returned to said conveying unit and to the magazine.
Claim 2
Independent Claim
196 words
A device for the detection of fission products, said device comprising: a magazine established by a rotary circular ring having equal and uniformly spaced openings each adapted to contain a very thin disc of insulating material metallized on both faces, a spherical collection chamber, two identical semiconductor electron detectors having a surface area at least equal to that of a disc and mounted in parallel relation at a very short distance from each other, a transfer plate provided with an opening capable of receiving each of said discs in succession, and a conveying unit defining a chamber having a thickness of said discs and movable between said circular ring and said transfer plate, whereby through suitable coordination of transfer plate and conveying unit displacement, one disc is caused to pass from said magazine into the opening of the transfer plate and displaced by said transfer plate to the center of the colleCtion chamber so as to permit collection of the ions, then located between the two detectors in order to permit measurement of the activity and of the energy spectrum of the collected ions and is then returned to said conveying unit and to the magazine.
Claim 3
Dependent Claim
25 words
A device according to claim 1, wherein the discs are each constituted by a polyester film such as ''''Mylar'''' which is metallized on both faces.
Claim 4
Dependent Claim
31 words
A device according to claim 1, wherein said device comprises retractable screens which stop beta radiations and can be interposed between the semiconductors and the faces of the disc under study.
Claim 5
Dependent Claim
26 words
A device according to claim 1, wherein said device comprises a duct for the introduction of inactive gas which is intended to sweep the two semiconductors.
Claim 6
Dependent Claim
36 words
A device according to claim 1, wherein said device comprises a conveying unit which permits the discharge of contaminated discs and the introduction of fresh discs or of source discs for either activity or energy calibration.
Claim 7
Dependent Claim
120 words
A detector of fission products for use with a collection chamber containing a gas having radioactive ions derived from fission products present in the gas, the improvement comprising: a plurality of very thin discrete discs suitable for collecting radioactive ions, magazine means for holding said discs and for serially positioning said discs in a first position for movement from said magazine, means for moving said discs individually from said first position to the collection chamber where radioactive ions are collected on opposite sides of said individual disc and for moving said individual disc from said collection chamber to a measuring station, and detector means at said measuring station for measuring the activity of said collected radioactive ions in all directions.
Claim 8
Dependent Claim
120 words
A detector of fission products for use with a collection chamber containing a gas having radioactive ions derived from fission products present in the gas, the improvement comprising: a plurality of very thin discrete discs suitable for collecting radioactive ions, magazine means for holding said discs and for serially positioning said discs in a first position for movement from said magazine, means for moving said discs individually from said first position to the collection chamber where radioactive ions are collected on opposite sides of said individual disc and for moving said individual disc from said collection chamber to a measuring station, and detector means at said measuring station for measuring the activity of said collected radioactive ions in all directions.
Claim 9
Dependent Claim
25 words
The apparatus of claim 6 in which each of said discs comprises: a very thin leaf of insulating material which is metallized on opposite sides.
Claim 10
Dependent Claim
16 words
The apparatus of claim 7 in which said insulating material is a polyester such as Mylar.
Claim 11
Dependent Claim
41 words
The apparatus of claim 6 in which said magazine means comprises: means defining a plurality of uniformly spaced openings each capable of holding one of said discs and indexing means for serially positioning each of said discs in said first position.
Claim 12
Dependent Claim
30 words
The apparatus of claim 9 in which said means defining a plurality of openings is a rotatable ring and said indexing means is a crank mechanically coupled to said ring.
Claim 13
Dependent Claim
60 words
The apparatus of claim 6 in which said moving means comprises: conveying means for moving said individual disc from said first position to a transfer position, and transfer means for moving said individual disc from said transfer position to said collection chamber and then to said measuring station, from where said conveying means returns said individual disc to said magazine.
Claim 14
Dependent Claim
41 words
The apparatus of claim 11 in which said conveying means is movable to a third position whereby a contaminated disc may be discharged or a fresh disc inserted and moved to said transfer position without being positioned at said first position.
Claim 15
Dependent Claim
14 words
The apparatus of claim 12 in which said third position is outside the apparatus.
Claim 16
Dependent Claim
30 words
The apparatus of claim 7 in which said detector means comprises: two identical circular semiconductors each having a surface area at least equal to that of one of said discs.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |