Patent US3855477A successfully refreshed from Google Patents.
US3855477A
Expired / Lapsed
US
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Detection and measurement of radiation damage by polarized light
Assignee: General Electric Co
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Filing: 1971-11-01
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Granted: 1974-12-17
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Expires: 1991-11-01
Abstract
Abstract A process for detecting radiation damage which comprises exposing a surface of a thin sheet of a polarizing dielectric material to radiation to form tracks of radiation damaged material therein which pass through the thickness of the sheet. The sheet is then contacted with an etchant which selectively dissolves and removes the tracks of radiation damage material to form holes extending from one surface of the sheet through the opposite surface. The resulting holes are a measure of radiation damage and are detected by visual means by detecting the light which emerges from the holes on one side of the etched polarizing sheet while the opposite side of the etched sheet is irradiated with light polarized in a single plane which said etched sheet material by proper positioning absorbs sufficiently to provide a significant contrast to light passing through the holes.
Inventors
- 👤 R Fleischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:17
CPC Classifications
G; G01; G01T; G01T5/00; G01T5/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
A process for detecting and measuring radiation damage which comprises providing a sheet of dielectric polarizing material having a thickness of at least about 1 micron, exposing said dielectric polarizing sheet to radiation to produce tracks of radiation damaged material therein extending from one surface through the opposite surface thereof, contacting said sheet with an etchant to selectively dissolve and remove said tracks of damaged material to form holes therein passing from one surface through the opposite surface thereof, said holes in the resulting etched polarizing sheet not being visible to the unaided eye, irradiating unpolarized visible light on a side of a polarizer which polarizes the light by selective absorption to transmit visible light polarized in a single plane, irradiating said visible light polarized in a single plane on one side of said etched polarizing sheet, and while said visible polarized light is irradiated on one side of said etched polarizing sheet positioning said sheet until it substantially blocks transmission of said visible polarized light and appears substantially opaque in said polarized light resulting in passage of said visible polarized light only through said holes in said sheet, said visible polarized light emerging from said holes on the opposite side of said sheet indicating the presence of said holes.
Claim 2
Dependent Claim
210 words
A process for detecting and measuring radiation damage which comprises providing a sheet of dielectric polarizing material having a thickness of at least about 1 micron, exposing said dielectric polarizing sheet to radiation to produce tracks of radiation damaged material therein extending from one surface through the opposite surface thereof, contacting said sheet with an etchant to selectively dissolve and remove said tracks of damaged material to form holes therein passing from one surface through the opposite surface thereof, said holes in the resulting etched polarizing sheet not being visible to the unaided eye, irradiating unpolarized visible light on a side of a polarizer which polarizes the light by selective absorption to transmit visible light polarized in a single plane, irradiating said visible light polarized in a single plane on one side of said etched polarizing sheet, and while said visible polarized light is irradiated on one side of said etched polarizing sheet positioning said sheet until it substantially blocks transmission of said visible polarized light and appears substantially opaque in said polarized light resulting in passage of said visible polarized light only through said holes in said sheet, said visible polarized light emerging from said holes on the opposite side of said sheet indicating the presence of said holes.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein said sheet of dielectric polarizing material is plastic.
Claim 4
Dependent Claim
240 words
A process for detecting and measuring radiation damage which comprises providing a dielectric polarizing laminated structure comprised of at least a first lamina and a second lamina, said first lamina being a radiation track-forming material at least 1 micron in thickness and said second lamina being a polarizing material, exposing said first lamina to radiation to produce tracks of radiation damaged material therein extending from one surface through its opposite surface, contacting said laminated structure with an etchant or solvent to selectively dissolve and remove said tracks of damaged material to form holes passing from one surface through the opposite surface of said laminated structure, said holes in the resulting etched laminated structure not being visible to the unaided eye, irradiating unpolarized visible light on a side of a polarizer which polarizes the light by selective absorption to transmit visible light polarized in a single plane, irradiating said visible light polarized in a single plane on one side of said etched laminated structure, and while said visible polarized light is irradiated on one side of said etched laminated structure positioning said laminated structure until it substantially blocks transmission of said visible polarized light and appears substantially opaque in said visible polarized light resulting in passage of said visible polarized light only through said holes in said laminated structure, said visible polarized light emerging from said holes on the opposite side of said laminated structure indicating the presence of said holes.
Claim 5
Dependent Claim
240 words
A process for detecting and measuring radiation damage which comprises providing a dielectric polarizing laminated structure comprised of at least a first lamina and a second lamina, said first lamina being a radiation track-forming material at least 1 micron in thickness and said second lamina being a polarizing material, exposing said first lamina to radiation to produce tracks of radiation damaged material therein extending from one surface through its opposite surface, contacting said laminated structure with an etchant or solvent to selectively dissolve and remove said tracks of damaged material to form holes passing from one surface through the opposite surface of said laminated structure, said holes in the resulting etched laminated structure not being visible to the unaided eye, irradiating unpolarized visible light on a side of a polarizer which polarizes the light by selective absorption to transmit visible light polarized in a single plane, irradiating said visible light polarized in a single plane on one side of said etched laminated structure, and while said visible polarized light is irradiated on one side of said etched laminated structure positioning said laminated structure until it substantially blocks transmission of said visible polarized light and appears substantially opaque in said visible polarized light resulting in passage of said visible polarized light only through said holes in said laminated structure, said visible polarized light emerging from said holes on the opposite side of said laminated structure indicating the presence of said holes.
Claim 6
Dependent Claim
18 words
A process according to claim 3 wherein said tracks of radiation damaged material extend through said laminated sTructure.
Claim 7
Dependent Claim
12 words
A process according to claim 1 wherein said laminated structure is plastic.
Claim 8
Dependent Claim
26 words
A process according to claim 5 wherein said first lamina is a polycarbonate and said second lamina is a cellulose film containing oriented iodoquinine sulphate crystals.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |