GB439728A - Orthoscopic diaphragms for roentgen ray working - Google Patents
Orthoscopic diaphragms for roentgen ray workingInfo
- Publication number
- GB439728A GB439728A GB2517/35A GB251735A GB439728A GB 439728 A GB439728 A GB 439728A GB 2517/35 A GB2517/35 A GB 2517/35A GB 251735 A GB251735 A GB 251735A GB 439728 A GB439728 A GB 439728A
- Authority
- GB
- United Kingdom
- Prior art keywords
- needles
- screen
- screens
- lead
- ray
- 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
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
- G21K1/025—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
439,728. R÷ntgen - ray screens. SIEMENS - REINIGER - WERKE AKT.- GES., 31, Karlstrasse, Berlin. Jan. 25, 1935, Nos. 2517 and 2518. Convention dates, Feb. 5, 1934 and Dec. 28, 1934. [Class 98 (i)] An orthoscopic screen for intercepting secondary radiation comprises an assembly of minute solid or tubular rods or needles, as of prismatic, cylindrical, truncated pyramidal, or conical form, made of ray-impermeable material such as lead, distributed irregularly but approximately uniformly over the area of the screen, the lengths of the rods or needles being substantially normal to the screen and directed towards a common point or line at a finite or infinite distance from the screen. Such a screen may be formed by cutting a disc of wood across the grain and filling its vessels as with metal, an alloy, or a lead compound ; or by perforating a plate with minute holes and filling them as with lead ; or by strewing pre-formed needles on a plate as of metal coated with a binding medium as of gelatin, erecting the needles by an electric field, warming the binder, cooling it again to fix the needles in erected position, and filling the interspaces with a ray-permeable liquid which sets ; or by pressing molten metal or alloy, or a paste containing lead, through the holes of perforated plate, hardening the extruded needles, and applying a filler; or by electrodeposition of needles on a metal plate and applying a filler ; or by forming by extrusion one or more fine wires as of lead coated with a binder as of gelatin, cutting into short lengths, assembling these in parallel juxtaposition and uniting them by heat, pressure, or application of a binder. Screens may also be formed by embedding needles e, Figs. 2 and 3, made for example of tungsten powder in a cellulose ester binder, transversely and irregularly in a carrier strip a as of unsized calendered paper, which may be coiled or doubled upon itself. The middle portion b of the coiled diaphragm may be a small disc cut eccentrically from another similar coil. Each face of the finished screen may be coated with waterproof varnish. The above methods produce screens with parallel elements, but curved screens may also be formed, as by bending in a steam bath a wooden screen produced as above. If such a screen is bent into the form of a spherical cap a, as shown in Fig. 1, screens of disc or other form may be produced from it by parallel cuts, as at f. The needles b are directed by the bending operation towards the position c of the ray-source. Reference is made to the movement of the screen during the radiographic exposure.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE439728X | 1934-02-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB439728A true GB439728A (en) | 1935-12-12 |
Family
ID=6507345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2517/35A Expired GB439728A (en) | 1934-02-05 | 1935-01-25 | Orthoscopic diaphragms for roentgen ray working |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB439728A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1107260A2 (en) * | 1999-11-30 | 2001-06-13 | Philips Corporate Intellectual Property GmbH | X-ray absorbing grid |
WO2005057255A2 (en) * | 2003-12-10 | 2005-06-23 | Koninklijke Philips Electronics N.V. | Collimator |
EP3574834A1 (en) * | 2018-05-30 | 2019-12-04 | Siemens Healthcare GmbH | Anti-scatter grid for a medical x-ray device |
-
1935
- 1935-01-25 GB GB2517/35A patent/GB439728A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1107260A2 (en) * | 1999-11-30 | 2001-06-13 | Philips Corporate Intellectual Property GmbH | X-ray absorbing grid |
EP1107260A3 (en) * | 1999-11-30 | 2004-05-19 | Philips Intellectual Property & Standards GmbH | X-ray absorbing grid |
WO2005057255A2 (en) * | 2003-12-10 | 2005-06-23 | Koninklijke Philips Electronics N.V. | Collimator |
WO2005057255A3 (en) * | 2003-12-10 | 2005-07-28 | Koninkl Philips Electronics Nv | Collimator |
EP3574834A1 (en) * | 2018-05-30 | 2019-12-04 | Siemens Healthcare GmbH | Anti-scatter grid for a medical x-ray device |
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