US2452524A - Protective grid for geiger-mueller tubes - Google Patents

Protective grid for geiger-mueller tubes Download PDF

Info

Publication number
US2452524A
US2452524A US93A US9348A US2452524A US 2452524 A US2452524 A US 2452524A US 93 A US93 A US 93A US 9348 A US9348 A US 9348A US 2452524 A US2452524 A US 2452524A
Authority
US
United States
Prior art keywords
anode
window
grid
wire
geiger
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 - Lifetime
Application number
US93A
Inventor
Metten Herbert
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Priority to US93A priority Critical patent/US2452524A/en
Application granted granted Critical
Publication of US2452524A publication Critical patent/US2452524A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01J47/08—Geiger-Müller counter tubes

Definitions

  • This invention relates to ray counters, and particularly to Geiger-Mueller counters of the type having a thin metal window for admitting beta rays.
  • Such counters generally have an anode and cathode near the, metal window, which may cause arcing to the window with consequent damage thereto.
  • My invention comprises placing a wire or grid between the cathode and anode near the window and connected to the cathode to prevent arcing to the window.
  • Figure 1 is asectional. side view 01' the invention.
  • FIG. 2 is a view showing the cathode, anode and grid wire in plan view, just inside the win-
  • the glass envelope I has the two lead-in wires '2 and 3 sealed therethrough at one end, the lead-in wire 2 being bent transversely inside the tube, i.
  • the U-shaped wire 4, attached thereto supports the cylindrical metal cathode, the insulating glass beads 5 and 6 extending from the ends of-said wire, as shown, to the wires 1 and 8 welded't'o said cathode cylinder 9, which is further supported by the lead-in wire 3 welded thereto at a'diiferent point and in electrical contact with said cathode.
  • the lead-in wire 3 being protected by a glass bead around it up to a point near the cathode.
  • the support 'wire l0 extending from the bent portion ii orlead-in wire 2 extends into the oathode cylinder' BItermInating near the middle thereof in a flnewfre of about 0.006 inch diameter which acts as anode and terminates in a glass ball i2.
  • the cathode cylinder Just below this ball l2 may'.-, be placed a wire 13 to act as the protective grid 0! my invention.
  • a thin metal window preferably of thin aluminum metal about 0.0005 to 0.001 inch thick is sealed across the otherwise open end of glass tube l, with the aidioi' a metal ring it sealed around the outside edge or the tube l as shown with the aluminum soldered thereto by the solder lb.
  • the potential gradient between the anode wire and the grid wire should be just slightly-greater than that between the anode wire and the aluminum window, so that should an overloaded condition develop for any reason and produce arcing, the arc will occur between anode and grid rather than between anode and window. This protects the window, which might otherwise develop a leak on severe or prolonged arcing, the window being so thin.
  • Such a thin window is necessary for good transmission of beta rays. Because of the thinness of the window, the pressure of the gas filling inside the tube should be in the neighborhood of atmospheric.
  • a mesh or grid of wires can be used instead of a single wire if desired, as long as the beta ray transmission is not too much reduced thereby.
  • the wire or grid should not be so close to the anode that arcing will occur at the normal operating voltage of the tube.
  • grid in the appended claims is intended to mean a grid or mesh of several Wires, or merely a single wire.
  • a beta ray counter tube having an anode, a cathode, a gas filling and a thin metal window, a grid connected to said cathode and extending near said anode in proximity to said window.
  • a beta ray counter tube comprising an envelope open at one end, a thin metal window sealing said end, a cathode extending toward but spaced from said window, an anode extending toward but spaced from said window, and a grid near said anode in the vicinity of said window and electrically connected to said cathode.

Description

Oct. 26, 1948. M T N 2,452,524
PROTECTIVE GRID FOR GEIGER-MUELLER TUBES Filed Jan. 2, 1948 INVENTOR.
Herbert L latte ATTORNEY Patented Oct. 26, 1948 PROTECTIVE GRID FOR GEIGER-MUELLER TUBES Herbert Metten, Boston, Mass., assignor to Sylvania Electric Products Inc., Salem, Mass., a corporation of Massachusetts Application January 2, 1948, Serial No. 93
l Claims. (Cl. 250--27.5)
. I a E This invention relates to ray counters, and particularly to Geiger-Mueller counters of the type having a thin metal window for admitting beta rays.
Such counters generally have an anode and cathode near the, metal window, which may cause arcing to the window with consequent damage thereto.
My inventioncomprises placing a wire or grid between the cathode and anode near the window and connected to the cathode to prevent arcing to the window.
Manyobjects-features and advantages of the invention willbe apparent from the following specification taken in connection with the accompanying drawing n which:
Figure 1 is asectional. side view 01' the invention; and
Figure 2 is a view showing the cathode, anode and grid wire in plan view, just inside the win- In the figures, the glass envelope I has the two lead-in wires '2 and 3 sealed therethrough at one end, the lead-in wire 2 being bent transversely inside the tube, i. The U-shaped wire 4, attached thereto supports the cylindrical metal cathode, the insulating glass beads 5 and 6 extending from the ends of-said wire, as shown, to the wires 1 and 8 welded't'o said cathode cylinder 9, which is further supported by the lead-in wire 3 welded thereto at a'diiferent point and in electrical contact with said cathode. The lead-in wire 3 being protected by a glass bead around it up to a point near the cathode.
The support 'wire l0 extending from the bent portion ii orlead-in wire 2 extends into the oathode cylinder' BItermInating near the middle thereof in a flnewfre of about 0.006 inch diameter which acts as anode and terminates in a glass ball i2. In-;the cathode cylinder Just below this ball l2 may'.-, be placed a wire 13 to act as the protective grid 0! my invention.
A thin metal window, preferably of thin aluminum metal about 0.0005 to 0.001 inch thick is sealed across the otherwise open end of glass tube l, with the aidioi' a metal ring it sealed around the outside edge or the tube l as shown with the aluminum soldered thereto by the solder lb.
The potential gradient between the anode wire and the grid wire should be just slightly-greater than that between the anode wire and the aluminum window, so that should an overloaded condition develop for any reason and produce arcing, the arc will occur between anode and grid rather than between anode and window. This protects the window, which might otherwise develop a leak on severe or prolonged arcing, the window being so thin.
Such a thin window is necessary for good transmission of beta rays. Because of the thinness of the window, the pressure of the gas filling inside the tube should be in the neighborhood of atmospheric.
A mesh or grid of wires can be used instead of a single wire if desired, as long as the beta ray transmission is not too much reduced thereby. The wire or grid should not be so close to the anode that arcing will occur at the normal operating voltage of the tube.
The word grid in the appended claims is intended to mean a grid or mesh of several Wires, or merely a single wire.
What I claim is:
1. In a beta ray counter tube having an anode, a cathode, a gas filling and a thin metal window, a grid connected to said cathode and extending near said anode in proximity to said window.
2. A beta ray counter tube comprising an envelope open at one end, a thin metal window sealing said end, a cathode extending toward but spaced from said window, an anode extending toward but spaced from said window, and a grid near said anode in the vicinity of said window and electrically connected to said cathode.
3. The combination of claim 2, in which the grid is near enough to the 'anode to make the voltage gradient between it and the anode greater than that between the window and anode.
4. The combination or claim 2 in which the grid is spaced from the anode a distance too great for arcing at the tubes normal operating voltage, but a distance short enough to have a lower arcing voltage to the anode than has the win-- dow.-
. HERBERT ME'I'I'EN.
No references cited.
US93A 1948-01-02 1948-01-02 Protective grid for geiger-mueller tubes Expired - Lifetime US2452524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US93A US2452524A (en) 1948-01-02 1948-01-02 Protective grid for geiger-mueller tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US93A US2452524A (en) 1948-01-02 1948-01-02 Protective grid for geiger-mueller tubes

Publications (1)

Publication Number Publication Date
US2452524A true US2452524A (en) 1948-10-26

Family

ID=21689885

Family Applications (1)

Application Number Title Priority Date Filing Date
US93A Expired - Lifetime US2452524A (en) 1948-01-02 1948-01-02 Protective grid for geiger-mueller tubes

Country Status (1)

Country Link
US (1) US2452524A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622208A (en) * 1950-03-20 1952-12-16 Bernstein William Radioactive particle counting
US2654041A (en) * 1950-06-01 1953-09-29 Westinghouse Electric Corp Radiation counter
US2683221A (en) * 1951-06-12 1954-07-06 Atomic Energy Commission Particle and gamma-ray energy spectrometer
US3030539A (en) * 1959-09-25 1962-04-17 Ianni Elmo J Di Geiger-muller tube with low gamma to beta or alpha response ratio
US4409485A (en) * 1981-10-02 1983-10-11 The United States Of America As Represented By The Secretary Of The Navy Radiation detector and method of opaquing the mica window
US10207128B2 (en) * 2016-12-28 2019-02-19 Msa Technology, Llc Fall protection device and adjustment mechanism therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622208A (en) * 1950-03-20 1952-12-16 Bernstein William Radioactive particle counting
US2654041A (en) * 1950-06-01 1953-09-29 Westinghouse Electric Corp Radiation counter
US2683221A (en) * 1951-06-12 1954-07-06 Atomic Energy Commission Particle and gamma-ray energy spectrometer
US3030539A (en) * 1959-09-25 1962-04-17 Ianni Elmo J Di Geiger-muller tube with low gamma to beta or alpha response ratio
US4409485A (en) * 1981-10-02 1983-10-11 The United States Of America As Represented By The Secretary Of The Navy Radiation detector and method of opaquing the mica window
US10207128B2 (en) * 2016-12-28 2019-02-19 Msa Technology, Llc Fall protection device and adjustment mechanism therefor

Similar Documents

Publication Publication Date Title
US2452524A (en) Protective grid for geiger-mueller tubes
US2295569A (en) Gaseous electron discharge device
GB499897A (en) Improvements in auxiliary electrodes in electric discharge devices
US2660687A (en) Mercury vapor rectifier tube employing magnetic field
GB1141448A (en) Multiple-cathode x-ray triode tube
US1956396A (en) Trigger tube
US2479529A (en) Electron discharge device
US2109274A (en) Tube structure
US2707753A (en) Electron discharge device
US2477110A (en) Electrode structure and device containing the same
US2463577A (en) Gaseous discharge device
GB687261A (en) Improvements relating to electric discharge devices
US1632080A (en) Electric discharge device
US1945639A (en) Discharge tube
GB682556A (en) Improvements in or relating to methods and apparatus for mounting and firing getters
US2727187A (en) Electric discharge lamp
US1613612A (en) Electron-discharge device
US2452861A (en) Current converting tube
US2056861A (en) Electric discharge tube or incandescent lamp
US2640945A (en) Introduction of active materials into evacuated envelopes
US3130344A (en) Gas-filled electric discharge devices
US2040883A (en) Electronic tube
US2413175A (en) Trigatron tube
US2222669A (en) Electrode structure
US3223772A (en) Leakage inhibiting supporting structure