US4408164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensation circuit for radiation detectors
Assignee: Department of National Defence
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Filing: 1981-09-01
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Granted: 1983-10-04
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Expires: 2001-09-01
Abstract
Abstract A compensation circuit for gamma-radiation detectors in which the pulses are sorted into different channels based on their amplitude. Pulse dividers are provided in the lower energy channels reducing the pulse count in these channels by an amount which is a function of the average energy of pulses received by that channel. The adjusted pulse count rates in each channel are then added to give a signal proportional to the dose rate independent of the radiation energy.
Inventors
- 👤 Phillip C. East
- 👤 Malcolm S. McGowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:31
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/026; H; H03; H03K; H03K5/00; H03K5/156; H03K5/22; H03K5/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
A signal processing circuit for use with a proportional radiation detector comprising: circuit means defining a plurality of different channels; logic means coupled to pulses from said detector to direct said pulse to one of said channels according to the amplitude of said pulse so that each channel receives a different range of pulse amplitudes; pulse-dividing means in each channel except the channel receiving pulses in the highest range, each said pulse-dividing means reducing the number of pulses at the respective channel output by a factor which is a function of the average amplitude of the pulses received by that channel; summing means connected to the output of each channel to provide an output pulse train whereby the count rate of the output pulse train is indicative of the dose rate of radiation incident on the detector.
Claim 2
Dependent Claim
137 words
A signal processing circuit for use with a proportional radiation detector comprising: circuit means defining a plurality of different channels; logic means coupled to pulses from said detector to direct said pulse to one of said channels according to the amplitude of said pulse so that each channel receives a different range of pulse amplitudes; pulse-dividing means in each channel except the channel receiving pulses in the highest range, each said pulse-dividing means reducing the number of pulses at the respective channel output by a factor which is a function of the average amplitude of the pulses received by that channel; summing means connected to the output of each channel to provide an output pulse train whereby the count rate of the output pulse train is indicative of the dose rate of radiation incident on the detector.
Claim 3
Dependent Claim
59 words
A circuit as set out in claim 1 wherein said logic means includes a comparator in each channel adapted to receive pulses from said detector at one of its inputs, biasing means connected to the other input of each comparator whereby the comparator switches in response to a pulse having an amplitude exceeding the minimum assigned to the channel.
Claim 4
Dependent Claim
70 words
A circuit as set out in claim 2 wherein said logic means further includes a NOR gate in each channel, except the channel receiving pulses in the highest range, one input of the NOR gate being coupled to the output of the respective comparator and the other input of the NOR gate being coupled to the output of the comparator of the channel of next higher range via an inverter.
Claim 5
Dependent Claim
51 words
A circuit as set out in claim 3 further including pulse-shaping means in each channel having pulse-dividing means and responsive thereto, a NAND gate, the output of each pulse-shaping means and the output of the channel receiving pulses in the highest range being coupled to the inputs of said NAND gate.
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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |