GB661814A - An improved apparatus for demonstrating the presence of supernormal radioactive radiation - Google Patents
An improved apparatus for demonstrating the presence of supernormal radioactive radiationInfo
- Publication number
- GB661814A GB661814A GB18626/49A GB1862649A GB661814A GB 661814 A GB661814 A GB 661814A GB 18626/49 A GB18626/49 A GB 18626/49A GB 1862649 A GB1862649 A GB 1862649A GB 661814 A GB661814 A GB 661814A
- Authority
- GB
- United Kingdom
- Prior art keywords
- condenser
- thyratron
- ionization chamber
- july
- fed
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/12—Provision for actuation of an alarm
- G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
661,814. Detecting radio-activity. GRAFFUNDER, W. H. July 14, 1949 [July 14, 1948; Feb. 1, 1949 and May 14, 1949], Nos. 18626/49; 18627/49, 18628/49. Class 40 (iii). A warning is operated when radio-activity in a particular region exceeds a mean adjustable level. Voltage pulses from an A.C. fed Geiger- Muller counter or ionization chamber may be used to charge a condenser in parallel with a leakage resistance so that if the condenser voltage exceeds an adjustable mean value a thyratron is triggered to operate a relay. A further relay may discharge the condenser so that the condenser is recharged if the radiation level does not fall and the apparatus gives periodic warnings. To lengthen the counter output pulses they may be applied to an A.C. fed thyratron before being integrated in the condenser, the thyratron firing at each pulse and remaining conductive until its plate voltage passes below zero. If an ionization chamber is used the chamber may be operated at a high potential but connected only intermittently to the amplifying circuit. The ionization chamber may be provided with a cover to retain radioactive dust, this cover being permeable to X-rays. It may for example be made of " Cellophane " (Registered Trade Mark) sheets or leaves, possibly supported by wire gauze.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH268313T | 1948-07-14 | ||
| CH271838T | 1949-02-01 | ||
| CH277888T | 1949-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB661814A true GB661814A (en) | 1951-11-28 |
Family
ID=25730999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18626/49A Expired GB661814A (en) | 1948-07-14 | 1949-07-14 | An improved apparatus for demonstrating the presence of supernormal radioactive radiation |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH277888A (en) |
| DE (1) | DE969251C (en) |
| FR (1) | FR990438A (en) |
| GB (1) | GB661814A (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE366858C (en) * | 1921-01-12 | 1923-01-12 | Wilhelm Hammer Dr | Device for measuring the dose of rays (x-ray, radium, light rays, etc.) |
| AT98599B (en) * | 1921-04-02 | 1924-11-25 | Siegmund Ing Strauss | Device for measuring ionization currents generated by X-rays. |
| GB339781A (en) * | 1928-12-24 | 1930-12-18 | Westinghouse Lamp Company | |
| DE576207C (en) * | 1930-09-21 | 1933-05-08 | Physikalisch Tech Werkstaetten | Device for measuring weak electrical currents by means of an electrometer designed as a relay, the moving part of which hits a contact when a certain voltage is reached |
| DE632374C (en) * | 1933-11-06 | 1936-07-07 | C H F Mueller Akt Ges | 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 |
| DE683329C (en) * | 1936-10-17 | 1939-11-04 | Physikalisch Tech Werkstaetten | Dosimeter for X-rays |
| DE740694C (en) * | 1942-02-24 | 1943-10-27 | Siemens Reiniger Werke Ag | Ionometric measuring device with a large ionization chamber |
-
1949
- 1949-05-14 CH CH277888D patent/CH277888A/en unknown
- 1949-07-08 FR FR990438D patent/FR990438A/en not_active Expired
- 1949-07-10 DE DEP3481D patent/DE969251C/en not_active Expired
- 1949-07-14 GB GB18626/49A patent/GB661814A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH277888A (en) | 1951-12-17 |
| FR990438A (en) | 1951-09-21 |
| DE969251C (en) | 1950-10-26 |
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