US3562480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoluminescent dosimeter badge
Assignee: United States Atomic Energy Commission
•
Filing: 1969-07-25
•
Granted: 1971-02-09
•
Expires: 1989-07-25
Abstract
Abstract A personnel dosimeter for detecting neutron radiation over a wide range of energies including two hemispheres of hydrogenous material with a 6LiF phosphor and a 7LiF phosphor imbedded in each hemisphere. One hemisphere having all of its surfaces covered with cadmium while the other hemisphere having only its curved surface covered with cadmium. Each 6LiF, 7LiF set of phosphors in each hemisphere measures different spectra of incident and body reflected neutrons. The difference in these measurements is correlatable to neutron dose over a wide range of neutron energies.
Inventors
- 👤 Alvin Korba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:43
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/10; G01T1/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
a 6LiF thermoluminescent phosphor for detecting gamma rays and thermal neutrons and a 7Lif thermoluminescent phosphor for detecting gamma radiation disposed adjacent to said base surface; b. a second hemisphere of solid hydrogenous material for thermalizing fast neutrons having a base surface and a curved surface, said second hemisphere disposed adjacent to said first hemisphere and having:
Claim 2
Dependent Claim
55 words
a 6LiF thermoluminescent phosphor for detecting gamma rays and thermal neutrons and a 7LiF thermoluminescent phosphor for detecting gamma radiation disposed adjacent to said base surface; and c. structural means for maintaining the base surfaces of both hemispheres adjacent to a person so that the curved surfaces of both hemispheres project outwardly from said person.
Claim 3
Dependent Claim
18 words
The personnel dosimeter of claim 1 wherein said second hemisphere is of smaller diameter than said first hemisphere.
Claim 4
Dependent Claim
27 words
The dosimeter of claim 2 wherein said first hemisphere has a diameter of about 5 centimeters and said second hemisphere has a diameter of about 2.5 centimeters.
Claim 5
Dependent Claim
28 words
The dosimeter of claim 1 wherein said thermoluminescent phosphors are thin wall wafer shaped and have flat surfaces disposed generally parallel to the base surfaces of said hemispheres.
Claim 6
Dependent Claim
12 words
The dosimeter of claim 1 wherein said hemispheres are composed of polyethylene.
Claim 7
Dependent Claim
19 words
The dosimeter of claim 1 wherein the spectrum of neutron energy measurement is from thermal to about 1 Me.
References Cited (Backward Citations)
US2938121A
Cited
US3420999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |