Patent US4460830A successfully refreshed from Google Patents.
US4460830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable radiation measuring device
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
•
Filing: 1981-10-19
•
Granted: 1984-07-17
•
Expires: 2001-10-19
Abstract
Abstract The present invention relates to a portable radiation measuring device, comprising a detector adapted to deliver electrical signals whose amplitude spectrum depends biunivocally on the energy spectrum of a radiation which may be received by the detector, amplification means and electronic means for compensating the sensitivity of the detector as a function of the energy so as to render it identical to that of human tissues, producing an output signal which is in a constant ratio with the energy of said radiation which may be absorbed by human tissues and display means, connected to the amplification and compensation means, for displaying the dose of radiation received by the detector.
Inventors
- 👤 Robert Allemand
- 👤 Michel Laval
- 👤 Pierre Parot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:32
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/15; G01T1/02; G01T1/026
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
106 words
Portable radiation measuring device, comprising a detector adapted to deliver electrical signals whose amplitude spectrum depends in a one-to-one relationship on the energy spectrum of a radiation capable of being received by the detector, amplification means and electronic means for compensating the sensitivity of the detector as a function of the energy so as to render it identical to that of human tissues, producing an output signal which is in a constant ratio with the energy of said radiation which may be absorbed by human tissues, and display means connected to the amplification and compensation means, for displaying the dose of radiation received by the detector.
Claim 2
Dependent Claim
106 words
Portable radiation measuring device, comprising a detector adapted to deliver electrical signals whose amplitude spectrum depends in a one-to-one relationship on the energy spectrum of a radiation capable of being received by the detector, amplification means and electronic means for compensating the sensitivity of the detector as a function of the energy so as to render it identical to that of human tissues, producing an output signal which is in a constant ratio with the energy of said radiation which may be absorbed by human tissues, and display means connected to the amplification and compensation means, for displaying the dose of radiation received by the detector.
Claim 3
Dependent Claim
15 words
The portable device of claim 1, wherein the detector is a detector with semiconductor crystal.
Claim 4
Dependent Claim
15 words
The portable device of claim 2, wherein the semiconductor crystal is a cadmium telluride crystal.
Claim 5
Dependent Claim
14 words
The portable device of claim 2, wherein the semiconductor crystal is a silicon crystal.
Claim 6
Dependent Claim
22 words
The portable device of any one of claims 1 to 4, wherein it further comprises a nuclear filter constituting an absorbent screen.
Claim 7
Dependent Claim
19 words
The portable device of claim 5, wherein the absorbent screen is made of a material containing tin and lead.
Claim 8
Dependent Claim
24 words
The portable device of claim 1, wherein it comprises a sound alarm which triggers off for a given dose rate threshold of a radiation.
Claim 9
Dependent Claim
50 words
The portable device of claim 1, wherein the compensation means are of the digital type and comprise a shaping circuit ensuring amplitude-time conversion, whose output is connected to one of the inputs of an AND gate, and a clock, whose input is connected to the other input of said gate.
Claim 10
Dependent Claim
15 words
The portable device of claim 8, wherein the clock is a clock at fixed frequency.
Claim 11
Dependent Claim
15 words
The portable device of claim 8, wherein the clock is a clock with increasing frequency.
Claim 12
Dependent Claim
35 words
The portable device of claim 1, wherein the amplification and compensation means are of analog type and comprise a variable gain amplifier, whose output is connected via an appropriate electronic circuit to the display means.
Claim 13
Dependent Claim
20 words
The portable device of claim 1, wherein the display means comprise a scaler connected to a display via an adder.
Claim 14
Dependent Claim
46 words
The portable device of claim 9, wherein the display means comprises a scaler connected to a display via an adder, and wherein the fixed frequency clock is associated with a memory whose inputs are connected to the scaler and whose outputs are connected to the adder.
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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |