US3225199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radioisotope identifier
Assignee: Atomic Energy of Canada Ltd AECL
•
Filing: 1962-05-14
•
Granted: 1965-12-21
•
Expires: 1982-05-14
Abstract
No abstract record available.
Inventors
- 👤 Ronald W Tolmie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:52
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/08; G; G01; G01R; G01R23/00; G01R23/02; G01R23/06; G01R23/09; G01T; G01T1/00; G01T1/16; G01T1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
IN APPARATUS FOR MEASURING THE ENERGY OF LOCAL RADIATION WHICH INCLUDES, A PAIR OR RADIATION DETECTORS OF THE COUNTING PULSE TYPE, WHOSE RATE OF COUNTING DEPENDS UPON THE NUMBER OF RADIATIONS QUANTA INTERCEPTED IN A GIVEN TIME INTERVAL, A RADIATION ABSORBING SHIELD FOR ABSORBING A PROPORTION OF THE RADIATION FALLING ON ONE OF SAID DETECTORS, SAID PROPORTION BEING DEPENDENT UPON THE ENERGY OF THE RADIATION, AND MEANS FOR DERIVING THE RATIO OF THE NUMBER OF COUNTS OF SAID SHIELED DETECTOR AND THE SUM OF THE NUMBER COUNTS OF BOTH SAID DETECTORS AS A POTENTIAL DIFFERENCE, SAID RATIO BEING A FUNCTION OF THE LOCAL RADIATION ENERGY, THE IMPROVEMENT COMPRISING SAID RADIATION ABSORBING SHIELD BEING FORMED OF AT LEAST TWO DISSIMILAR MATERIALS OF DIFFERENT ABSORPTION COEFFICIENTS FOR A GIVEN ENERGY OF RADIATION, FOR PROVIDING DIFFERENT ATTENUATIONS FOR RADIATION ENCOUNTERING SAID ONE DETECTOR FROM SEPARATE CHOSEN DIRECTIONS, THE RATE OF COUNTING OF SAID ONE DETECTOR BEING DETERMINED BY THAT MATERIAL WHICH IS INTERPOSED BETWEEN SAID ONE DETECTOR AND A SOURCE OF RADIATION.
Claim 2
Dependent Claim
169 words
IN APPARATUS FOR MEASURING THE ENERGY OF LOCAL RADIATION WHICH INCLUDES, A PAIR OR RADIATION DETECTORS OF THE COUNTING PULSE TYPE, WHOSE RATE OF COUNTING DEPENDS UPON THE NUMBER OF RADIATIONS QUANTA INTERCEPTED IN A GIVEN TIME INTERVAL, A RADIATION ABSORBING SHIELD FOR ABSORBING A PROPORTION OF THE RADIATION FALLING ON ONE OF SAID DETECTORS, SAID PROPORTION BEING DEPENDENT UPON THE ENERGY OF THE RADIATION, AND MEANS FOR DERIVING THE RATIO OF THE NUMBER OF COUNTS OF SAID SHIELED DETECTOR AND THE SUM OF THE NUMBER COUNTS OF BOTH SAID DETECTORS AS A POTENTIAL DIFFERENCE, SAID RATIO BEING A FUNCTION OF THE LOCAL RADIATION ENERGY, THE IMPROVEMENT COMPRISING SAID RADIATION ABSORBING SHIELD BEING FORMED OF AT LEAST TWO DISSIMILAR MATERIALS OF DIFFERENT ABSORPTION COEFFICIENTS FOR A GIVEN ENERGY OF RADIATION, FOR PROVIDING DIFFERENT ATTENUATIONS FOR RADIATION ENCOUNTERING SAID ONE DETECTOR FROM SEPARATE CHOSEN DIRECTIONS, THE RATE OF COUNTING OF SAID ONE DETECTOR BEING DETERMINED BY THAT MATERIAL WHICH IS INTERPOSED BETWEEN SAID ONE DETECTOR AND A SOURCE OF RADIATION.
References Cited (Backward Citations)
US2563333A
Cited
US2744697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |