US4596932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable dosimeter
Assignee: Memorial Sloan Kettering Cancer Center
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Filing: 1983-05-17
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Granted: 1986-06-24
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Expires: 2003-05-17
Abstract
Abstract A dosimeter for measuring the intensity of high energy electron, photon, or other particle radiation has ion, electron, and radiation shields about at least respectively sensitive components of the dosimeter. The entire dosimeter, therefore, can be assembled as a unit and portably placed in the radiation to be measured. Ruggedness for this desirable partability is provided by the use in the dosimeter of a pancake ionization chamber which also eliminates the need to calibrate radiologically the dosimeter.
Inventors
- 👤 Alfonso Buffa
- 👤 Richard Caley
- 👤 Karl Pfaff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:53
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/185; G01T1/15
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
193 words
A simple but very accurate portable dosimeter for indicating the intensity of ionizing radiation, comprising, as a unit: (a) a radiation-detection chamber having a pair of parallel, facing, electrically-conducting, radiation-permeable electrodes spaced from each other to define a volume for a gas which is ionizable by the radiation when exposed thereto; (b) electric potential supply means connected across the electrodes for attracting the gas ions to the electrodes and transferring their charge to the electrodes; (c) detection circuit means connected across the electrodes and having at least one of high-frequency electromagnetic- and radiation-sensitive components for detecting the charge on the electrodes and indicating therefrom a representation of the intensity of the radiation; (d) radiation shield means surrounding the radiation-sensitive components of the detection circuit means for shielding the latter from the ionizing radiation; (e) electric shield means surrounding the sensitive components of the detection circuit means for shielding the latter from electromagnetic interference including any caused by the ionizing radiation; and (f) ion shield means potting the ion-sensitive components for shielding them from radiation-caused ambient ionization; whereby the entire dosimeter may be assembled as the unit and portably transported into various radiation sources.
Claim 2
Dependent Claim
193 words
A simple but very accurate portable dosimeter for indicating the intensity of ionizing radiation, comprising, as a unit: (a) a radiation-detection chamber having a pair of parallel, facing, electrically-conducting, radiation-permeable electrodes spaced from each other to define a volume for a gas which is ionizable by the radiation when exposed thereto; (b) electric potential supply means connected across the electrodes for attracting the gas ions to the electrodes and transferring their charge to the electrodes; (c) detection circuit means connected across the electrodes and having at least one of high-frequency electromagnetic- and radiation-sensitive components for detecting the charge on the electrodes and indicating therefrom a representation of the intensity of the radiation; (d) radiation shield means surrounding the radiation-sensitive components of the detection circuit means for shielding the latter from the ionizing radiation; (e) electric shield means surrounding the sensitive components of the detection circuit means for shielding the latter from electromagnetic interference including any caused by the ionizing radiation; and (f) ion shield means potting the ion-sensitive components for shielding them from radiation-caused ambient ionization; whereby the entire dosimeter may be assembled as the unit and portably transported into various radiation sources.
Claim 3
Dependent Claim
16 words
A portable dosimeter as in claim 1, wherein the radiation shield means comprises a lead enclosure.
Claim 4
Dependent Claim
29 words
A portable dosimeter as in claim 1, wherein the electric shield means comprises an electrically conducting enclosure electrically connected to the detection circuit means for draining any charge therefrom.
Claim 5
Dependent Claim
25 words
A portable dosimeter as in claim 1, wherein the shield means comprises potting the ion sensitive components of the detector circuit means in appropriate wax.
Claim 6
Dependent Claim
35 words
A portable dosimeter as in claim 1, wherein the detector circuit means further comprises signal processor means for converting the electron charge on the electrodes into a representation of the radiation in radiation measurement units.
Claim 7
Dependent Claim
16 words
A portable dosimeter as in claim 5, wherein the radiation shield means comprises a lead enclosure.
Claim 8
Dependent Claim
29 words
A portable dosimeter as in claim 5, wherein the electric shield means comprises an electrically conducting enclosure electrically connected to the detection circuit means for draining any charge therefrom.
Claim 9
Dependent Claim
26 words
A portable dosimeter as in claim 5, wherein the ion shield means comprises potting the ion sensitive components of the detector circuit means in appropriate wax.
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) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |