GB442389A - Improvements in or relating to electrical devices for automatically interrupting radiation - Google Patents

Improvements in or relating to electrical devices for automatically interrupting radiation

Info

Publication number
GB442389A
GB442389A GB31776/34A GB3177634A GB442389A GB 442389 A GB442389 A GB 442389A GB 31776/34 A GB31776/34 A GB 31776/34A GB 3177634 A GB3177634 A GB 3177634A GB 442389 A GB442389 A GB 442389A
Authority
GB
United Kingdom
Prior art keywords
grid
discharge tube
condenser
switch
radiation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB31776/34A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHF Mueller AG
Original Assignee
CHF Mueller AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHF Mueller AG filed Critical CHF Mueller AG
Publication of GB442389A publication Critical patent/GB442389A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J47/00—Tubes for determining the presence, intensity, density or energy of radiation or particles
    • H01J47/02—Ionisation chambers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/15—Instruments in which pulses generated by a radiation detector are integrated, e.g. by a diode pump circuit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/38—Exposure time
    • H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube
    • H05G1/44—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube in which the switching instant is determined by measuring the amount of radiation directly

Abstract

442,389. Discharge apparatus. MULLER AKT.-GES., C. H. F., 24, R÷ntgenstrasse, Hamburg, Germany. Nov. 5, 1934, No. 31776. Convention date, Nov. 6, 1933. [Class 39 (i)] [See also Group XX] A device for automatically determining the duration of radiation comprises a vacuum discharge tube controlling the switching on and off of the radiation, the charge on the grid of the discharge tube being determined by the charge of a condenser which discharges through an ionization chamber, the characterizing feature being that the condenser is negatively charged through the grid and cathode of the vacuum discharge tube. In Fig. 2 the switch 11 is operated by the current through the discharge tube 6 which has an anode 10, a grid 8, and a cathode 5. A switch 12 connects the cathode either to the negative end of a source of voltage 3 whereby the condenser 2 is charged negatively via the grid 8 ; or to the grid through the condenser 2 whereby a negative charge is imparted to the grid. As the radiation ionizes the gas in the chamber 1 the charge leaks away and the current through the discharge tube gradually increases until the switch 11 is operated to interrupt radiation. In Fig. 3 the ionization chamber functions as the condenser and is also made integral with the discharge tube. The condenser is charged from the transformer secondary 19, rectifier 20 and rheostat 23, and by connection of the switch 12 to the tapping 24, the electrode 17 and grid 18 are made negative with respect to the cathode 22. The flow of current through the discharge tube 14 brings about a potential drop in a resistance 26 whereby the grid of the triode 29 is made positive, the anode current of which operates the relay switch 32. In order to lengthen the surface leakage path and improve the insulation, the ionization chamber is provided with a support extending inwardly and surrounded by a hood shaped inner electrode. An interfused metal ring connects the two walls that support the electrodes and this ring is connected to a point having a negative potential, e.g. the end of the resistance 23. Specification 339,215, [Class 98 (i)], is referred to.
GB31776/34A 1933-11-06 1934-11-05 Improvements in or relating to electrical devices for automatically interrupting radiation Expired GB442389A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM125511D DE632374C (en) 1933-11-06 1933-11-06 Device with a capacitor that is charged via the grid and the cathode of an electron relay and discharged via an ionization chamber influenced by radiation

Publications (1)

Publication Number Publication Date
GB442389A true GB442389A (en) 1936-02-07

Family

ID=7330755

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31776/34A Expired GB442389A (en) 1933-11-06 1934-11-05 Improvements in or relating to electrical devices for automatically interrupting radiation

Country Status (5)

Country Link
US (1) US2122222A (en)
DE (1) DE632374C (en)
FR (1) FR780848A (en)
GB (1) GB442389A (en)
NL (1) NL40886C (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE762277C (en) * 1937-03-25 1954-06-08 Licentia Gmbh Device for measuring the intensity of a stream of slow neutrons by means of an ionization chamber
US2465377A (en) * 1938-11-24 1949-03-29 Banque Pour Entpr S Electr Gas-sensing control means with gas-discharge device
US2588789A (en) * 1945-05-22 1952-03-11 Atomic Energy Commission Neutron detector
US2624847A (en) * 1945-09-04 1953-01-06 William P Jesse Ballistic electrometer
US2536991A (en) * 1945-09-18 1951-01-02 Ernest O Wollan Radiation detector
US2451908A (en) * 1946-03-07 1948-10-19 Canadian Radium And Uranium Co Method and apparatus for detecting changes in dimensions
US2479271A (en) * 1946-11-21 1949-08-16 Francis R Shonka Ionization chamber circuit
US2546500A (en) * 1947-01-22 1951-03-27 Raytheon Mfg Co Electrical circuits
US2574000A (en) * 1947-03-27 1951-11-06 Victoreen Instr Company Ionization and vacuum tube chamber
US2601583A (en) * 1947-05-26 1952-06-24 Charles O Ballou Radiation measuring instrument
US2692339A (en) * 1947-09-02 1954-10-19 Nat Res Dev Gamma-ray detector
US2521315A (en) * 1947-10-04 1950-09-05 Victoreen Instr Company Geiger tube
CH277888A (en) * 1948-07-14 1951-12-17 Walter Dr Graffunder Arrangement to warn of abnormal radioactive radiation.
US2549058A (en) * 1949-01-07 1951-04-17 James M Constable Portable radiation detector
US2609511A (en) * 1949-10-25 1952-09-02 Jr Edward F Wright Sensitive pulse amplifier counter
US2666890A (en) * 1950-07-27 1954-01-19 Bendix Aviat Corp Apparatus for testing geiger tubes
US3011059A (en) * 1952-05-07 1961-11-28 Beckman Instruments Inc Triggering and measuring circuit for radiation integration and other purposes
DE958041C (en) * 1952-05-20 1957-02-14 Telefunken Gmbh AC-controlled relay arrangement
US2728861A (en) * 1952-12-31 1955-12-27 Floyd M Glass Radiation pocket screamer
US2859353A (en) * 1954-06-16 1958-11-04 Cox Raymond John Circuits for current measurments
US2938197A (en) * 1954-09-14 1960-05-24 Automatic Fire Alarm Company Automatic alarm transmitter
US3110011A (en) * 1960-09-02 1963-11-05 Jr Benard Burson Electronic canceller for automobile turn indicators
US3483379A (en) * 1967-11-24 1969-12-09 Field Emission Corp Automatic x-ray exposure control having a detector whose response is correlated with the x-ray absorption properties of the x-ray film
US3666950A (en) * 1969-09-30 1972-05-30 Westinghouse Electric Corp Integral multi-sensor radiation detector
US5179582A (en) * 1992-04-20 1993-01-12 S&S Inficon Inc. Exposure control circuit for X-ray generation

Also Published As

Publication number Publication date
NL40886C (en) 1937-06-15
FR780848A (en) 1935-05-04
US2122222A (en) 1938-06-28
DE632374C (en) 1936-07-07

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