Patent US3908128A successfully refreshed from Google Patents.
US3908128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved radiation sensing device
Assignee: Siemens Gammasonics Inc
•
Filing: 1973-09-12
•
Granted: 1975-09-23
•
Expires: 1993-09-12
Abstract
Abstract A radiation sensing device including a collimator, a disc-shaped scintillation crystal in close proximity thereto, photomultiplier tubes for viewing the scintillations and circuitry for locating the scintillation in the crystal. A diode or other non-linear compensation means is biased by an A.C. and D.C. source and thereby corrects for distortion and non-uniformity of the field.
Inventors
- 👤 Joseph B Richey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:19
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1642; A; A61; A61B; A61B6/00; A61B6/42; A61B6/4208; A61B6/4258
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A radiation sensing device comprising: means for forming a visible response from radiation; means for converting the visible response from radiation to electrical impulses, the means for forming being substantially adjacent to the means for converting thereby causing distortion of the relation of the electrical impulses to the location of the radiation; and means for operating on the electrical impulses to create a signal which gives an indication of the relative location of the radiation including; means for correcting distortion including a non-linear response device which gives an output which is not directly proportional to the input signal, the means for correcting further including a non-linear device having an input and an output and a varying biasing means operatively connected to the non-linear device to vary the output thereof.
Claim 2
Dependent Claim
129 words
A radiation sensing device comprising: means for forming a visible response from radiation; means for converting the visible response from radiation to electrical impulses, the means for forming being substantially adjacent to the means for converting thereby causing distortion of the relation of the electrical impulses to the location of the radiation; and means for operating on the electrical impulses to create a signal which gives an indication of the relative location of the radiation including; means for correcting distortion including a non-linear response device which gives an output which is not directly proportional to the input signal, the means for correcting further including a non-linear device having an input and an output and a varying biasing means operatively connected to the non-linear device to vary the output thereof.
Claim 3
Dependent Claim
20 words
The radiation sensing device of claim 1 wherein a substantially constant biasing means is also applied to the nonlinear device.
Claim 4
Dependent Claim
33 words
The radiation sensing device of claim 2 wherein the non-linear device is a diode, the varying biasing means is a varying voltage and the substantially constant biasing means is a constant biasing voltage.
Claim 5
Dependent Claim
32 words
The radiation sensing device of claim 3 wherein the diode is operatively connected to a series resistor, the diode and resistor being in parallel with the output from the diode bias device.
Claim 6
Dependent Claim
74 words
The radiation sensing device of claim 1 wherein the means for converting includes at least three substantially parallel photomultiplier tubes substantially adjacent to and on one side of the means for forming in order that the photomultiplier tubes receive the maximum amount of radiation, view common radiation and give electrical responses as a result thereof; and the means for forming includes a collimator on the other side of a scintillator from the photomultiplier tubes.
Claim 7
Dependent Claim
39 words
The radiation sensing device of claim 5 which further includes a means for permitting limited current around the diode at a voltage below the threshold value of the diode in order to improve resolution of the radiation sensing device.
Claim 8
Dependent Claim
21 words
The radiation sensing device of claim 6 wherein the means for permitting current is a resistor in parallel With the diode.
Claim 9
Dependent Claim
48 words
The radiation sensing device of claim 1 wherein the non-linear device is a transistor operatively connected to the means for converting having base, collector and emitter, the varying biasing means is a varying voltage applied to the base and a D.C. biasing means is applied to the base.
Claim 10
Dependent Claim
28 words
The radiation sensing device of claim 8 wherein the bias voltage is applied to the base and series resistors are operatively connected to the base, collector and emitter.
Claim 11
Dependent Claim
66 words
The radiation sensing device of claim 9 wherein the means for converting includes at least three substantially parallel photomultiplier tubes on one side of the means for forming in order that the photomultiplier tubes receive radiation, view common radiation and give electrical responses as a result thereof; and the means for forming includes a collimator on the other side of a scintillator from the photomultiplier tubes.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |