US3569711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring radiation with a plurality of detectors and determining source of highest radiation emanating from a surface area such as the screen of a color television set
Assignee: United States Department of Health and Human Services
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Filing: 1968-06-11
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Granted: 1971-03-09
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Expires: 1988-06-11
Abstract
Abstract A method and apparatus for detecting radiation is disclosed, the method and apparatus having particular utility in determining Xray emission from a surface area such as the screen of a television set. A multiple detector radiation measuring instrument is provided having a plurality of radiation sensors thereon. Novel circuitry is disclosed such that a readout is provided representing the radiation sensor having the highest output, this output signaling the presence of undesired radiation from some location on the screen surface. All except one of the plurality of radiation detectors or sensors are capable of being disabled such that the undesired source of radiation can be localized on the screen surface.
Inventors
- 👤 Richard K Stoms
- 👤 Edward Kuerze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:14
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
24 words
A radiation measurement instrument as defined in claim 1, further including means to disable all except one of said plurality of radiation detector means.
Claim 2
Dependent Claim
30 words
A radiation measurement instrument as defined in claim 2, wherein said radiation detector means comprises Geiger-Mueller tubes and wherein said readout means comprises a meter including electrical circuit means therefor.
Claim 3
Dependent Claim
140 words
A radiaTion sensor unit comprising: power supply means; a Geiger-Mueller tube; circuit means including a series capacitor for connecting said Geiger-Mueller tube to said power supply means; shunt resistor means placed in parallel circuit arrangement across said series capacitor; and voltage amplifying means coupled to said series capacitor and shunt resistor means whereby the output of the Geiger-Mueller tube is integrated by the capacitor and read as a voltage value, said voltage amplifying means comprising a field-effect transistor having an input gate coupled to said capacitor and two output electrodes; a transistor having a base electrode and an output circuit path; means connecting one of said output electrodes of said field-effect transistor to said base electrode of said transistor; and means connecting the other of said output electrodes of said field-effect transistor to said output circuit path of said transistor.
Claim 4
Dependent Claim
126 words
A radiation measuring instrument comprising: a plurality of radiation sensing unit means, each radiation sensing unit means producing an output in response to radiation impinging thereon; interconnection circuit means for interconnecting said plurality of radiation sensing unit means, said circuit means selecting the radiation sensing unit means having the highest output and producing a signal voltage in response thereto; Current generator means for producing a reference voltage; an electric meter; and means for coupling said electric meter with said interconnection circuit means and said current generator means such that said electric meter gives a reading upon an unbalance of said signal voltage with said reference voltage whereby the outputs of the other radiation sensing unit means of said plurality are effectively disconnected from said circuit means.
Claim 5
Dependent Claim
22 words
A radiation measuring instrument as defined in claim 5, further including electrical means for adjusting the effective sensitivity of said electric meter.
Claim 6
Dependent Claim
49 words
A radiation measuring instrument as defined in claim 6, further including a high voltage supply means connected to each of said plurality of radiation sensing unit means, and switch means for disconnecting said high voltage supply means from all except one of said plurality of radiation sensing unit means.
Claim 7
Dependent Claim
49 words
A radiation measuring instrument as defined in claim 7, further including audio alarm means coupled with said interconnection circuit means, said audio alarm means producing an audio signal in response to said signal voltage, the frequency of said audio signal being proportional to the level of said signal voltage.
Claim 8
Dependent Claim
30 words
A radiation measuring instrument as defined in claim 7, further including electrical means for adjusting the time rate of response of said electric meter to changes in said signal voltage.
Claim 9
Dependent Claim
58 words
A radiation measuring instrument as defined in claim 9, wherein each said radiation sensing unit means comprises a Geiger-Mueller tube; circuit means including a series capacitor for connecting said Geiger-Mueller tube across said high voltage supply means; shunt resistor means placed in parallel circuit arrangement across said series capacitor; and voltage amplifying means coupled to said series capacitor.
Claim 10
Independent Claim
103 words
A method of detecting and measuring undesired radiation emanating from a surface, such as the surface of a television screen, said method comprising the steps of: providing a number of radiation detectors; placing the radiation detectors adjacent the radiating surface and moving the radiation detectors across the radiating surface such that the entire radiating surface is surveyed; detecting the presence of undesired radiation from the surface by monitoring the radiation detector having the highest output; and localizing the specific source of the undesired radiation on the radiating surface by surveying the radiating surface with a single one of the plurality of radiation detectors.
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 |