Claims
- 1. An ionization device, cylindrical in shape, comprising:a mechanical base; an ionization chamber having an anode formed by a central rod in current-carrying material and a cathode in current-carrying material around the anode, both connected to two elements of said mechanical base, said ionization chamber being removable; two cylindrical end shields in non-magnetic and insulating material centered on the anode and arranged at right angles to the anode at both ends, said cylindrical end shields being provided with openings, the cathode being formed of a wire spooled on the outer rim of said two cylindrical end shields; and pin plugs arranged on the lower end shield, suitable for insertion into sockets arranged on a contact-holder unit of said mechanical base, the lower extremity of the anode and two ends of the wire forming the cathode being connected to said pin plugs.
- 2. An ionization device according to claim 1, in which the base is provided at its two extremities—upper and lower respectively—with a contact-holder unit and a connector, the sockets being connected by conducting wires to connector lugs.
- 3. An ionization device according to claim 2, in which a cylindrical protective shield for the chamber is fixed on the upper part of the base.
- 4. An ionization device according to claim 1, in which the anode is in stainless steel.
- 5. An ionization device according to claim 1, in which the two end shields are in Teflon.
- 6. An ionization device according to claim 1 in which the end shields are in ceramics.
- 7. An ionization device according to claim 1, in which the two end shields (36, 37) are in mixed material—ceramics+Teflon.
- 8. An ionization device according to claim 1, in which the cathode comprises a platinum wire.
- 9. An ionization device according to claim 8, in which the platinum wire has a diameter of 0.05 mm.
- 10. An activity measuring channel of a β radiation gas emitter comprising an ionization device according claim 1, a pre-amplification unit assembled just behind the ionization device, an electronic signal processor and a connecting cable between the pre-amplification unit and the electronic processor.
- 11. A measuring channel according to claim 10, in which the pre-amplification unit comprises an analog to digital converter.
- 12. A measuring channel according to claim 10 which is a tritium measuring channel.
- 13. Implementation process of the ionization device according to claim 1, in which a heater current is circulated in the cathode during measurement.
- 14. Implementation process of the ionization device according to claim 1, in which a heater current is circulated in the cathode at the time of decontamination vacuum baking, the temperature being above 400° C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
99 04962 |
Apr 1999 |
FR |
|
Parent Case Info
This application is a national phase of PCT/FR00/01001 which was filed on Apr. 18, 2000, and was not published in English.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/FR00/01001 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/63948 |
10/26/2000 |
WO |
A |
US Referenced Citations (4)
Non-Patent Literature Citations (1)
Entry |
Overhoff Technology Corporation, “Tritum and Other Radiogas Monitors”. |