SE7812025L - IONIZATION CHAMBER - Google Patents

IONIZATION CHAMBER

Info

Publication number
SE7812025L
SE7812025L SE7812025A SE7812025A SE7812025L SE 7812025 L SE7812025 L SE 7812025L SE 7812025 A SE7812025 A SE 7812025A SE 7812025 A SE7812025 A SE 7812025A SE 7812025 L SE7812025 L SE 7812025L
Authority
SE
Sweden
Prior art keywords
chamber
radioactive material
air
support
radioactive
Prior art date
Application number
SE7812025A
Other languages
Unknown language ( )
Swedish (sv)
Inventor
J Mallory
Z Turlej
Original Assignee
Isotec Ind Ltd
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 Isotec Ind Ltd filed Critical Isotec Ind Ltd
Publication of SE7812025L publication Critical patent/SE7812025L/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
    • H01J41/08—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of radioactive substances, e.g. alphatrons

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Measurement Of Radiation (AREA)

Abstract

In an electronic smoke sensing and alarm device, a dual ionization chamber arrangement comprises a single source of radioactive material and first and second chambers separated by a common electrically conductive electrode. A portion of the radioactive material ionizes the air in the first chamber and another portion of the radioactive material ionizes the air in the second chamber. This arrangement provides an accurate control on the current flow through each chamber. A single source 36 of radioactive material, eg. Americium 241 or Nickel 63, may be disposed on a support 38 which is located on the partition 16 separating the two chambers 28 and 30 so that approximately the same amount of radioactive material is exposed in each chamber. The source and its support may be various shapes. Alternatively, the partition itself may be made up of a radioactive substance. <IMAGE>
SE7812025A 1978-04-19 1978-11-22 IONIZATION CHAMBER SE7812025L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA301,975A CA1109570A (en) 1978-04-19 1978-04-19 Dual ionization chamber

Publications (1)

Publication Number Publication Date
SE7812025L true SE7812025L (en) 1979-10-20

Family

ID=4111341

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7812025A SE7812025L (en) 1978-04-19 1978-11-22 IONIZATION CHAMBER

Country Status (4)

Country Link
CA (1) CA1109570A (en)
DE (1) DE2851820A1 (en)
GB (1) GB2019642B (en)
SE (1) SE7812025L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3041137C2 (en) * 1980-10-31 1984-09-20 Siemens AG, 1000 Berlin und 8000 München Capacitive gas detector
US20120146798A1 (en) * 2009-07-08 2012-06-14 Michael Dziekan Method of utilizing ionization chambers to detect radiation and aerosolized radioactive particles

Also Published As

Publication number Publication date
DE2851820A1 (en) 1979-10-31
GB2019642A (en) 1979-10-31
GB2019642B (en) 1982-12-15
CA1109570A (en) 1981-09-22

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