GB752971A - Improvements in and relating to control systems responsive to x-ray emission - Google Patents
Improvements in and relating to control systems responsive to x-ray emissionInfo
- Publication number
- GB752971A GB752971A GB20602/54A GB2060254A GB752971A GB 752971 A GB752971 A GB 752971A GB 20602/54 A GB20602/54 A GB 20602/54A GB 2060254 A GB2060254 A GB 2060254A GB 752971 A GB752971 A GB 752971A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ray
- relay
- capacitor
- thyratron
- rays
- 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
-
- 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
- H01J47/12—Neutron detector tubes, e.g. BF3 tubes
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- X-Ray Techniques (AREA)
Abstract
752,971. Controlling X-ray dosage. GENERAL ELECTRIC CO. July 14, 1954 [July 14, 1953], No. 20602/54. Class 40 (3). In a system for controlling X-ray dosage, means are provided for compensating for the operating time of the relay that terminates the exposure. As shown, the energization of relay 55 by starting button 59 is followed by that of relay 31 which energizes the X-ray tube 11. The rays after traversing the test or treated body 33 act on a fluorescent screen influencing a photo-cell or on a mercury sulphide or cadmium sulphide or selenide cell responsive directly to X-rays, either type of cell controlling the charging rate of a capacitor 52 which determines the instant of operation of a thyratron 45 the anode relay 48 of which releases 31 to extinguish the X-ray tube. Since a given relayoperating time represents different voltage changes according to the condenser charging rate, it is necessary to charge the condenser under the joint control of the X-ray-sensitive device and of an increasingly negative bias voltage. In the case assumed, the emission of X-rays is intermittent, and in consequence the charging current also is intermittent and the bias voltage must change intermittently. The X-ray-sensitive device 38 may be a photoelectric tube of the electron multiplier type with its end dynode connected to the grid 46 of thyratron 43 and to the capacitor 62 and its anode coupled to the input circuit of an amplifier V1 ... V4 the last valve of which acts as a switch and is conductive during each X-ray pulse and non-conductive in the intervals. As a result the charge on capacitor 52 depends jointly on the initial charge due to its connection to the point 75 before the operation of the start relay, on the number of positive pulses received from the photo-multiplier 38 and on an intermittently exponentially varying bias obtained by charging capacitor 60 via the switching tube V4. The possibility is mentioned of applying the exponentially-varying bias to the second grid of the thyratron 43.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US367937A US2909666A (en) | 1953-07-14 | 1953-07-14 | Interval timing apparatus and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB752971A true GB752971A (en) | 1956-07-18 |
Family
ID=23449228
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20602/54A Expired GB752971A (en) | 1953-07-14 | 1954-07-14 | Improvements in and relating to control systems responsive to x-ray emission |
| GB20601/54A Expired GB780982A (en) | 1953-07-14 | 1954-07-14 | Improvements in and relating to electric switching apparatus |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20601/54A Expired GB780982A (en) | 1953-07-14 | 1954-07-14 | Improvements in and relating to electric switching apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US2909666A (en) |
| JP (2) | JPS325672B1 (en) |
| DE (2) | DE1110769B (en) |
| FR (2) | FR1167459A (en) |
| GB (2) | GB752971A (en) |
| NL (1) | NL105205C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3573461A (en) * | 1969-04-01 | 1971-04-06 | Stig Arne Ohlsson | Method and apparatus for timing exposures in x-ray photography |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2958782A (en) * | 1958-01-13 | 1960-11-01 | Gen Electric | Electronic timer |
| US2993145A (en) * | 1958-04-30 | 1961-07-18 | Bell Telephone Labor Inc | Switching apparatus |
| US3046451A (en) * | 1958-10-01 | 1962-07-24 | Westinghouse Electric Corp | Switching circuit |
| US3152255A (en) * | 1959-07-24 | 1964-10-06 | Philips Corp | Device for measuring the X-ray radiations absorbed by a specimen |
| US3119932A (en) * | 1960-02-12 | 1964-01-28 | Philips Corp | Polyphase current switching device for an x-ray tube supply circuit |
| US3094618A (en) * | 1961-05-23 | 1963-06-18 | Picker X Ray Corp | X-ray tube protection mechanism |
| US3440422A (en) * | 1965-06-24 | 1969-04-22 | Picker Corp | Biplane x-ray image system |
| US3557371A (en) * | 1968-06-10 | 1971-01-19 | Scope Corp X | Method and apparatus for calibrating a cardiac x-ray synchronizer |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2473922A (en) * | 1949-06-21 | Breathing indicator | ||
| DE625011C (en) * | 1932-12-17 | 1936-02-01 | Bbc Brown Boveri & Cie | Electromagnetic alternating current protection |
| BE410041A (en) * | 1934-06-08 | |||
| US2150440A (en) * | 1936-06-10 | 1939-03-14 | Western Union Telegraph Co | Magnetic and resonator selector for carrier conveyers |
| DE691080C (en) * | 1936-11-04 | 1940-05-16 | Otto Muck | Device for switching an alternating current circuit |
| US2165048A (en) * | 1937-08-26 | 1939-07-04 | Westinghouse Electric & Mfg Co | Electric discharge apparatus |
| FR863046A (en) * | 1939-01-26 | 1941-03-21 | Thomson Houston Comp Francaise | Improvements to discharge device circuits |
| DE904916C (en) * | 1939-04-27 | 1954-02-25 | Aeg | Control method for high voltage electric tubes |
| US2282182A (en) * | 1939-09-07 | 1942-05-05 | Westinghouse Electric & Mfg Co | Amplifier circuit |
| US2361172A (en) * | 1940-07-31 | 1944-10-24 | Westinghouse Electric & Mfg Co | Electronic power factor relay overload protection |
| US2413020A (en) * | 1943-05-19 | 1946-12-24 | Photoswitch Inc | Electronic relay |
| US2401289A (en) * | 1943-07-22 | 1946-05-28 | Nasa | Photoelectric timer for roentgen photography |
| US2453486A (en) * | 1945-01-01 | 1948-11-09 | Picker X Ray Corp Waite Mfg | Electronic timer |
| US2422020A (en) * | 1945-03-27 | 1947-06-10 | Gen Electric | Electric control circuit |
| US2561085A (en) * | 1946-06-01 | 1951-07-17 | Westinghouse Electric Corp | Automatic exposure timer |
| US2573029A (en) * | 1946-09-12 | 1951-10-30 | Kelley Koett Mfg Company | X-ray apparatus |
| US2438303A (en) * | 1947-02-28 | 1948-03-23 | Simmon Brothers Inc | Device for making color prints |
| US2494218A (en) * | 1947-07-03 | 1950-01-10 | Picker X Ray Corp Waite Mfg | Stabilizer with condenser modulator |
| US2679598A (en) * | 1950-12-04 | 1954-05-25 | Westinghouse Electric Corp | X-ray apparatus |
| US2747104A (en) * | 1951-10-06 | 1956-05-22 | Gen Electric | Interval timing apparatus |
| DE951020C (en) * | 1951-11-25 | 1956-10-18 | Siemens Ag | Three-phase contactor for synchronous switch-off, the contacts of which are opened shortly before the current crosses zero in order to avoid switching lights |
-
1953
- 1953-07-14 US US367937A patent/US2909666A/en not_active Expired - Lifetime
- 1953-07-14 US US367947A patent/US2809296A/en not_active Expired - Lifetime
-
1954
- 1954-06-29 FR FR1167459D patent/FR1167459A/en not_active Expired
- 1954-07-09 DE DEG14842A patent/DE1110769B/en active Pending
- 1954-07-13 FR FR53987D patent/FR74415E/en not_active Expired
- 1954-07-13 DE DEG14876A patent/DE1010657B/en active Pending
- 1954-07-14 JP JP1471554A patent/JPS325672B1/ja active Pending
- 1954-07-14 NL NL189208A patent/NL105205C/en active
- 1954-07-14 GB GB20602/54A patent/GB752971A/en not_active Expired
- 1954-07-14 GB GB20601/54A patent/GB780982A/en not_active Expired
-
1960
- 1960-08-10 JP JP1336059U patent/JPS3519055Y1/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3573461A (en) * | 1969-04-01 | 1971-04-06 | Stig Arne Ohlsson | Method and apparatus for timing exposures in x-ray photography |
Also Published As
| Publication number | Publication date |
|---|---|
| US2809296A (en) | 1957-10-08 |
| DE1010657B (en) | 1957-06-19 |
| US2909666A (en) | 1959-10-20 |
| DE1110769B (en) | 1961-07-13 |
| FR74415E (en) | 1960-12-19 |
| NL105205C (en) | 1963-02-15 |
| JPS3519055Y1 (en) | 1960-08-10 |
| JPS325672B1 (en) | 1957-07-29 |
| FR1167459A (en) | 1958-11-25 |
| GB780982A (en) | 1957-08-14 |
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