US3864574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring iodine
Assignee: GESELLSCHAFT fur KERMFORSCHUNG MBH
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Filing: 1973-03-14
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Granted: 1975-02-04
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Expires: 1993-03-14
Abstract
Abstract In an apparatus for measuring a radioactive iodine isotope in air, there is provided a conduit that carries the iodinecontaining air, a scintillation crystal disposed in the conduit in an axially coextensive manner and an iodine-adsorbing filter which surrounds the scintillation crystal at least along a length portion thereof and entirely fills the cross-sectional area of the conduit at any point along that length portion. The apparatus responds with substantially the same efficiency to both elemental and chemically bound iodine.
Inventors
- 👤 Jurgen Wilhelm
- 👤 Kurt Gerlach
- 👤 Heinrich Mahnau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:42
CPC Classifications
G; G01; G01T; G01T7/00; G01T7/02; G01T7/04; G01T1/00; G01T1/16; G01T1/20; G01T1/202
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
151 words
An apparatus for measuring the radioactive iodine isotope 131 in air by means of detecting the quantum radiation generated by the decomposition of said iodine, said iodine being present in air in elemental and chemically bound form, comprising: a. a conduit carrying air containing said iodine, said conduit having an inner wall face; b. a scintillator disposed in said conduit and oriented in an axially coextensive relationship therewith; c. a filter for adsorbing said iodine in its elemental form and in its chemically bound form, said filter entirely surrounding at least one length portion of said scintillator and fully occupying the entire cross section of said conduit between said scintillator and said inner wall face along any point of said length portion; and d. means provided in said conduit downstream of said filter for accommodating a photomultiplier at an end of said scintillator, said end being situated downstream of said filter.
Claim 2
Independent Claim
151 words
An apparatus for measuring the radioactive iodine isotope 131 in air by means of detecting the quantum radiation generated by the decomposition of said iodine, said iodine being present in air in elemental and chemically bound form, comprising: a. a conduit carrying air containing said iodine, said conduit having an inner wall face; b. a scintillator disposed in said conduit and oriented in an axially coextensive relationship therewith; c. a filter for adsorbing said iodine in its elemental form and in its chemically bound form, said filter entirely surrounding at least one length portion of said scintillator and fully occupying the entire cross section of said conduit between said scintillator and said inner wall face along any point of said length portion; and d. means provided in said conduit downstream of said filter for accommodating a photomultiplier at an end of said scintillator, said end being situated downstream of said filter.
Claim 3
Dependent Claim
31 words
An apparatus as defined in claim 1, further comprising a distributor means in said conduit upstream of said filter for uniformly distributing the gas prior to its passage through said filter.
Claim 4
Dependent Claim
27 words
An apparatus as defined in claim 2, said conduit having an axis; said distributor means being constituted of a disc disposed substantially normal to the conduit axis.
Claim 5
Dependent Claim
23 words
An apparatus as defined in claim 1, further comprising a photomultiplier disposed in said conduit downstream of said filter and adjoining said scintillator.
Claim 6
Dependent Claim
15 words
An apparatus as defined in claim 1, including a thin-walled tubular housing containing said scintillator.
Claim 7
Dependent Claim
17 words
An apparatus as defined in claim 1, wherein said scintillator is a sodium iodide (Tl) scintillation crystal.
Claim 8
Dependent Claim
17 words
An apparatus as defined in claim 1, wherein said fiLtering layer is made of impregnated activated carbon.
Claim 9
Dependent Claim
20 words
An apparatus as defined in claim 1, wherein said filtering layer is made of a SiO2 catalyst impregnated with AgNO3.
Claim 10
Dependent Claim
18 words
An apparatus as defined in claim 1, wherein said scintillator is disposed coaxially with respect to said conduit.
Claim 11
Dependent Claim
22 words
An apparatus as defined in claim 1, wherein said scintillator is movably arranged in said filter and projects beyond opposite faces thereof.
Claim 12
Dependent Claim
34 words
An apparatus as defined in claim 1, further including heating means for preheating said air in said apparatus upstream of said filter to set the relative humidity of said air to a predetermined value.
Claim 13
Dependent Claim
27 words
An apparatus as defined in claim 11, said heating means including a heater coil and a thermostatic circuit means connected thereto for maintaining constant said predetermined value.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |