US3569697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoluminescent dosimeter for providing a total radiation measure of radio-activity in a fluid medium to which the dosimeter is exposed
Assignee: United States Atomic Energy Commission
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Filing: 1969-02-11
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Granted: 1971-03-09
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Expires: 1989-02-11
Abstract
Abstract The present dosimeter includes a cylindrical housing having an intake port at one end and an exhaust port at the opposite end. A thermoluminescent disc and a radioactivity filter are coaxially and spatially mounted with respect to each other within the housing, with the thermoluminescent disc being mounted adjacent the intake port and having an aperture therethrough coaxially aligned with the intake port. The radioactivity filter is sealed to the interior walls of the housing. A pump draws a fluid medium through the ports of the housing to effect deposition of radioactive material of the fluid medium on the radioactivity filter. Energy from the radiation emitted by the ionizing radioactive material is absorbed by the thermoluminescent disc and stored. A heat source is provided to excite the thermoluminescent disc, the emitted light intensity therefrom being a measure of the detected radiation.
Inventors
- 👤 David E Mccurdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:29
CPC Classifications
G; G01; G01T; G01T7/00; G01T7/02; G01T7/04; G01T1/00; G01T1/02; G01T1/10; G01T1/11
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
A dosimeter for providing a total radiation measure of radioactivity in a fluid medium to which the dosimeter is exposed comprising an elongated housing including an intake port and an exhaust port axially mounted with respect to each other at opposite ends thereof, means for generating a flow of said fluid medium through said ports and housing, a thermoluminescent member mounted within said housing to said intake port end and including an aperture therethrough sized and aligned with respect to said intake port to permit the passage of said liquid medium, a radioactivity filter mounted within said housing in sealed engagement with the interior walls thereof to accept fluid medium flow from the aperture of said thermoluminescent member, said radioactivity filter being spaced from and oriented with respect to said thermoluminescent member to effect an even distribution of fluid medium flow over said filter and radiation coupling between said thermoluminescent member and said radioactivity filter, and means for exciting said thermoluminescent member causing light emission therefrom, which light emission is a total radiation measure of the radioactivity in the coupled fluid medium.
Claim 2
Dependent Claim
182 words
A dosimeter for providing a total radiation measure of radioactivity in a fluid medium to which the dosimeter is exposed comprising an elongated housing including an intake port and an exhaust port axially mounted with respect to each other at opposite ends thereof, means for generating a flow of said fluid medium through said ports and housing, a thermoluminescent member mounted within said housing to said intake port end and including an aperture therethrough sized and aligned with respect to said intake port to permit the passage of said liquid medium, a radioactivity filter mounted within said housing in sealed engagement with the interior walls thereof to accept fluid medium flow from the aperture of said thermoluminescent member, said radioactivity filter being spaced from and oriented with respect to said thermoluminescent member to effect an even distribution of fluid medium flow over said filter and radiation coupling between said thermoluminescent member and said radioactivity filter, and means for exciting said thermoluminescent member causing light emission therefrom, which light emission is a total radiation measure of the radioactivity in the coupled fluid medium.
Claim 3
Dependent Claim
20 words
The apparatus as defined in claim 1 wherein said thermoluminescent member comprises a thermoluminescent material embedded in a matrix material.
Claim 4
Dependent Claim
21 words
The apparatus as defined in claim 2 wherein the thermoluminescent member is a disc comprising LiF embedded in a polytetrafluorethylene matrix.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |