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Patent US4415237A successfully refreshed from Google Patents.
US4415237A
Expired / Lapsed
US
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Radiation dosimeter
Assignee: ENERGY United States, Department of
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Filing: 1981-09-01
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Granted: 1983-11-15
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Expires: 2001-09-01
Abstract
Abstract A radiation detector readout circuit is provided which produces a radiation dose-rate readout from a detector even though the detector output may be highly energy dependent. A linear charge amplifier including an output charge pump circuit amplifies the charge signal pulses from the detector and pumps the charge into a charge storage capacitor. The discharge rate of the capacitor through a resistor is controlled to provide a time-dependent voltage which when integrated provides an output proportional to the dose-rate of radiation detected by the detector. This output may be converted to digital form for readout on a digital display.
Inventors
- 👤 Richard J. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:17
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A radiation dosimeter, comprising: an ionizing radiation detector which produces output signals at an output thereof in response to the charge collected due to the occurance of ionizing events within the sensitive region of said detector; a charge amplifier means for detecting and amplifying said signals at said output of said detector which are proportional to said collected charge; a charge storage capacitor connected to the output of said amplifier means; a resistor connected in parallel with said capacitor for controlling the discharge rate of said capacitor at a selected value; and an integrator means connected to the output of said charge amplifier means for time averaging the discharge current of said capacitor to generate an output signal at an output thereof proportional to the radiation dose-rate detected by said detector.
Claim 2
Dependent Claim
131 words
A radiation dosimeter, comprising: an ionizing radiation detector which produces output signals at an output thereof in response to the charge collected due to the occurance of ionizing events within the sensitive region of said detector; a charge amplifier means for detecting and amplifying said signals at said output of said detector which are proportional to said collected charge; a charge storage capacitor connected to the output of said amplifier means; a resistor connected in parallel with said capacitor for controlling the discharge rate of said capacitor at a selected value; and an integrator means connected to the output of said charge amplifier means for time averaging the discharge current of said capacitor to generate an output signal at an output thereof proportional to the radiation dose-rate detected by said detector.
Claim 3
Dependent Claim
46 words
The dosimeter as set forth in claim 1 wherein said charge amplifier means includes a variable threshold voltage discriminator means for rendering said amplifier means less sensitive to detected photons below about 60 Kev, thereby providing linear dose-rate measurements for detected photons above about 60 Kev.
Claim 4
Dependent Claim
63 words
The dosimeter as set forth in claim 2 wherein said charge amplifier means and said integrator means includes a charge feedback amplifier connected to said detector, a differentiator connected to the output of said charge feedback amplifier, a charge pump amplifier connected between the output of said differentiator and said capacitor, and a dual-slope charge integrator connected to the output of said capacitor.
Claim 5
Dependent Claim
33 words
The dosimeter as set forth in claim 3 further including an analog-to-digital converter connected to the output of said integrator and a digital readout means connected to the output of said analog-to-digital converter.
Claim 6
Dependent Claim
15 words
The dosimeter as set forth in claim 4 wherein said detector is a CdTe detector.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |