US3845310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety system for target irradiating device
Assignee: Thales SA
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Filing: 1972-04-05
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Granted: 1974-10-29
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Expires: 1992-04-05
Abstract
Abstract A safety system for switching off an irradiation system when the desired irradiation dose has been exceeded, comprises two ionisation chambers through which a particle beam issued from the radiation source propagates, each chamber supplying a radiation monitor. Those monitors supply two parallel connected comparators which operate contact breakers connected in series in a safety circuit controlling the irradiation system.
Inventors
- 👤 C Perraudin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/29; G01T7/00; G01T7/12; G01T7/125
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A safety system for preventing the irradiation of a target by a particle beam from rising above a predetermined reference level, said system comprising: two ionization chambers positioned on the propagation path of said beam, for providing signals proportional to the instantaneous radiation propagation therethrough, said chambers having respective outputs; two monitoring systems respectively connected to said outputs, each monitoring system comprising means for measuring the output signal applied thereto from one of said chambers; and means for switching off said beam upon one of said signals exceeding a value corresponding to said predetermined reference radiation level.
Claim 2
Dependent Claim
97 words
A safety system for preventing the irradiation of a target by a particle beam from rising above a predetermined reference level, said system comprising: two ionization chambers positioned on the propagation path of said beam, for providing signals proportional to the instantaneous radiation propagation therethrough, said chambers having respective outputs; two monitoring systems respectively connected to said outputs, each monitoring system comprising means for measuring the output signal applied thereto from one of said chambers; and means for switching off said beam upon one of said signals exceeding a value corresponding to said predetermined reference radiation level.
Claim 3
Dependent Claim
60 words
A system as claimed in claim 1, wherein said means for switching off said beam comprises means for comparing the respective output signals of said monitoring systems to a predetermined signal level and further means controlled by said comparing means for switching off said beam upon the difference between said output signals of said monitoring systems exceeding a predetermined value.
Claim 4
Dependent Claim
25 words
A system as claimed in claim 2, wherein each of said monitoring systems comprises a series amplifier and integrator means, quantizing means and counting means.
Claim 5
Dependent Claim
30 words
A system as claimed in claim 3, wherein said means respectively controlled by said monitoring systems and said means controlled by said comparing system are all connected in series circuit.
Claim 6
Dependent Claim
36 words
A system as claimed in claim 4, further comprising means for checking the operation of said counting means, and further switching off means, controlled by said checking means And connected in series in said series circuit.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |