EP0513515B1 - Shielding system, in particular for a gammagraphy device - Google Patents

Shielding system, in particular for a gammagraphy device Download PDF

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Publication number
EP0513515B1
EP0513515B1 EP19920105745 EP92105745A EP0513515B1 EP 0513515 B1 EP0513515 B1 EP 0513515B1 EP 19920105745 EP19920105745 EP 19920105745 EP 92105745 A EP92105745 A EP 92105745A EP 0513515 B1 EP0513515 B1 EP 0513515B1
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EP
European Patent Office
Prior art keywords
shielding body
coupling
tube
channel
gammagraphy
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.)
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Application number
EP19920105745
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German (de)
French (fr)
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EP0513515A3 (en
EP0513515A2 (en
Inventor
Karl Weinlich
Rainer Dr. Link
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ISOTOPEN-TECHNIK DR SAUERWEIN GmbH
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ISOTOPEN-TECHNIK DR SAUERWEIN GmbH
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Publication of EP0513515A2 publication Critical patent/EP0513515A2/en
Publication of EP0513515A3 publication Critical patent/EP0513515A3/en
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    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21FPROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F5/00Transportable or portable shielded containers
    • G21F5/02Transportable or portable shielded containers with provision for restricted exposure of a radiation source within the container
    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21FPROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00Shielding characterised by the composition of the materials
    • G21F1/02Selection of uniform shielding materials
    • G21F1/08Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals

Definitions

  • the invention relates to a shielding body for a gamma imaging device with a radiator which can be extended from a shielding body, a coupling for an extension tube and a channel in the shielding body which prevents radiation from escaping when the radiator is retracted.
  • Such gammagraphy devices are used for the safe handling of radioactive emitters, for example in the non-destructive radiation test of workpieces. These devices not only have to ensure safe protection of the operating personnel against radioactive radiation when the emitter has moved back into the shielding body, they also have to enable safe remote control when the emitter is extended from the shielding body into the area of a workpiece. To achieve this, gammagraphy devices are known that guarantee a high degree of safety through complex radiation protection and a semi or fully automatic operation. However, these devices are complex and accordingly heavy and complicated to use.
  • the invention is therefore based on the object of providing an easy-to-use shielding body for a gammagraphy device which, despite adequate radiation protection, ensures low weight and a high level of security against incorrect operation.
  • a helically twisted channel is arranged in the shielding body for guiding a movable radiator.
  • the channel can be made more compact compared to, for example, S-shaped channels known from US Pat. No. 3,593,594, as a result of which the shielding body becomes smaller and lighter.
  • the shielding body can at least partially consist of tungsten powder compressed with a heat-resistant binder; it can also consist, for example, of an essentially spherical part made of a high-density material, for example depleted uranium with an essentially diametrically extending channel and a channel located in front of the channel exit essential cylindrical part consist of tungsten powder compressed with a heat-resistant binder with the axially offset and spatially twisted channel arranged therein.
  • the uranium ball provides a uniform shielding of the beam in all directions when it has moved back to the center of the ball.
  • the cylindrical part made of tungsten powder in front of the duct outlet serves to shield the duct outlet and for this purpose receives the twisted duct, so that reliable shielding is also ensured in this area.
  • the cylindrical part consists of tungsten powder compressed with a heat-resistant binder
  • the twisted channel can be produced in a simple manner from a tube embedded in the tungsten powder and protruding into a diametrical bore in the uranium ball.
  • the gammagraphy device can be provided with a safety lock to prevent the radiator from being extended without a connected extension hose and / or without a connected remote control for the radiator.
  • the safety lock can consist of a locking slide for the spotlight which can be displaced transversely to the channel axis, an axially displaceable locking block which can be coupled to the movement of the spotlight and which releases the locking slide in the retracted position of the spotlight, and at least one locking block actuated by the coupling of the extension tube , the locking slide with the release hose not released, the lock.
  • the locking slide can have a transverse bore for the locking stone and at least one transverse bore for the bolt as well as a shoulder in the bore for the locking stone which interacts with a notch in an actuating tube.
  • the radiator can be arranged on a cable guided through the locking stone and the actuating tube and can be arranged in a head that is somewhat thickened relative to the bore in the actuating tube.
  • the coupling for the remote control can be arranged opposite to the coupling for the extension hose on the gammagraphy device; they actuate axially displaceable locking pins, which interact with the locking slide, via coupling sleeves in the sense of unlocking when the extension tube is properly coupled and the operator is coupled.
  • the gammagraphy device has a cylindrical housing 1 which is closed at both ends by an end plate 2.
  • An intermediate plate 3 is arranged in the central region of the housing 1.
  • the Gammagraphy device is provided with a carrying handle 4 and a foot 5 in order to be able to handle it easily.
  • a spherical part 6 of a shielding body 23 made of depleted uranium is arranged between one of the end plates 2 and the intermediate plate 3.
  • the uranium ball 6 has cylindrical extensions 7 which engage in corresponding approaches of the end plate 2 and the intermediate plate 3 and hold the uranium ball 6.
  • a diametrical bore extends from a part 8 of smaller diameter and a part 9 of larger diameter reaching to the center of the uranium ball 6.
  • a cylindrical part 10 of the shielding body 23 adjoins the cylindrical extension 7 with the diametrical bore 9 of larger diameter, which consists of a tube piece 11 made of tungsten powder 12 compressed with a heat-resistant binder.
  • the pipe section 11 is screwed to the intermediate plate 3 and the end plate 2.
  • a helically bent tube 13 is embedded, which serves as a channel 37 for extending a gamma emitter 18.
  • One end of the tube 13 protrudes from the cylindrical Part 10 out and into the hole 9 of larger diameter in the uranium ball 6. In this way, the channel 37 goes directly into the diametrical bore 8 of smaller diameter in the uranium ball 6.
  • a coupling 14 for an extension hose with a coupling sleeve 15 and a coupling 16 for remote control with a coupling sleeve 17 are arranged.
  • the remote control can be coupled via the coupling 16 with an articulated connection 20 to a gamma emitter 18 arranged in a radiator holding head 19.
  • a flexible cable 21 of the remote control extends into the area of the coupling 16 and can be coupled to the articulated connection 20 when the coupling 16 is connected.
  • An axially displaceable actuating tube 22 is arranged in the bore 8, the inner diameter of which is large enough to allow the articulated connection 20 and the flexible cable 21 to be displaced axially. However, the diameter of the radiator holding head 19 is so large that it cannot be retracted into the actuating tube 22.
  • both a bolt in the form of a pin 28 and a bolt in the form of a pin 38 are engaged in corresponding bores 33, 34 of the locking slide 24.
  • a shoulder 36 engages behind a notch 35 in a transverse bore 32 in the locking slide 24 in the actuating tube 22 and in the articulated connection 20 of the radiator holding head 19; it thereby prevents the gamma emitter 18 from unintentionally coming out of the channel 37.
  • the extension hose is coupled to the gammagraphy device via the coupling 14 and the remote control via the coupling 16, the coupling sleeves 15 and 17 effect this by means of a pin 31, a lever 30 and a connection 29 Withdrawing the bolt 28 and moving the bolt 38, which thus emerge from the bores 33, 34 in the locking slide 24.
  • the unlocked locking slide 24 can be moved laterally until it reaches the position shown in FIG. 6. In this position, a transverse bore 32 in the locking slide 24 is aligned with the locking block 26, while the shoulder 36 from the area of the notch 35 in the articulated connection 20 and the actuating tube 22 is moved out.
  • the locking block 26 comes under the action of a compression spring 27 into the region of the transverse bore 32 and holds the locking slide 24 in the unlocked position.
  • the gamma emitter 18 in the emitter holder head 19 can now be moved by means of the articulated connection 20 and the flexible cable 21 of the remote control coupled therewith through the channel 37 and the coupling 14 into the extension tube until it reaches the area where the non-destructive material testing takes place to be carried out.
  • the gamma emitter 18 can be moved back into the shielding body 23 in the reverse manner, after which there is again a locking according to FIG. 5.
  • the couplings 14, 15 can be released from the gammagraphy device, which can now be transported to another location.

Description

Die Erfindung betrifft einen Abschirmkörper für ein Gammagraphie-Gerät mit einem aus einem Abschirmkörper ausfahrbaren Strahler, einer Kupplung für einen Ausfahrschlauch und einem ein Austreten von Strahlung im eingefahrenen Zustand des Strahlers verhindernden Kanal im Abschirmkörper.The invention relates to a shielding body for a gamma imaging device with a radiator which can be extended from a shielding body, a coupling for an extension tube and a channel in the shielding body which prevents radiation from escaping when the radiator is retracted.

Derartige Gammagraphie-Geräte dienen dem sicheren Umgang mit radioaktiven Strahlern beispielsweise bei der zerstörungsfreien Durchstrahlungsprüfung von Werkstücken. Diese Geräte müssen nicht nur einen sicheren Schutz des Bedienungspersonals gegen radioaktive Strahlung gewährleisten, wenn der Strahler in den Abschirmkörper zurückgefahren ist, sondern sie müssen auch eine sichere Fernbedienung beim Ausfahren des Strahlers aus dem Abschirmkörper bis in den Bereich eines Werkstücks ermöglichen. Um dies zu erreichen, sind Gammagraphie-Geräte bekannt, die ein hohes Maß an Sicherheit durch einen aufwendigen Strahlungsschutz sowie ein halb- oder vollautomatisches Betätigen gewährleisten. Diese Geräte sind indessen aufwendig gebaut und dementsprechend schwer sowie kompliziert in der Handhabung.Such gammagraphy devices are used for the safe handling of radioactive emitters, for example in the non-destructive radiation test of workpieces. These devices not only have to ensure safe protection of the operating personnel against radioactive radiation when the emitter has moved back into the shielding body, they also have to enable safe remote control when the emitter is extended from the shielding body into the area of a workpiece. To achieve this, gammagraphy devices are known that guarantee a high degree of safety through complex radiation protection and a semi or fully automatic operation. However, these devices are complex and accordingly heavy and complicated to use.

Der Erfindung liegt daher die Aufgabe zugrunde, einen einfach zu handhabenden Abschirmkörper für ein Gammagraphie-Gerät zu schaffen, der trotz eines ausreichenden Strahlenschutzes ein geringes Gewicht und eine hohe Sicherheit gegen fehlerhafte Bedienung gewährleistet.The invention is therefore based on the object of providing an easy-to-use shielding body for a gammagraphy device which, despite adequate radiation protection, ensures low weight and a high level of security against incorrect operation.

Ausgehend von dieser Aufgabenstellung wird vorgeschlagen, daß im Abschirmkörper zur Führung eines verfahrbaren Strahlers erfindungsgemäß ein schraubenförmig verwundener Kanal angeordnet ist. Auf diese Weise kann durch den Ausfahrkanal des Abschirmkörpers keinerlei Strahlung austreten und ist an jeder Stelle des Kanals ausreichend Abschirmmasse vorhanden. Der Kanal läßt sich im Vergleich zu beispielsweise aus der US-Patentschrift 3 593 594 bekannten S-förmigen Kanälen kompakter ausführen, wodurch der Abschirmkörper kleiner und leichter wird.Based on this task, it is proposed that a helically twisted channel is arranged in the shielding body for guiding a movable radiator. In this way, no radiation can escape through the extension channel of the shielding body and sufficient shielding mass is available at every point of the channel. The channel can be made more compact compared to, for example, S-shaped channels known from US Pat. No. 3,593,594, as a result of which the shielding body becomes smaller and lighter.

Der Abschirmkörper kann wenigstens teilweise aus mit einem hitzebeständigen Bindemittel verdichteten Wolframpulver bestehen; er kann auch aus einem beispielsweise im wesentlichen kugelförmigen Teil aus einem Material hoher Dichte, beispielsweise abgereichertem Uran mit einem im wesentlichen diametral verlaufenden Kanal und einem vor dem Kanalausgang befindlichen, im wesentlichen zylindrischen Teil aus mit einem hitzebeständigen Bindemittel verdichtetem Wolframpulver mit dem darin angeordneten, axial versetzten und räumlich verwundenen Kanal bestehen. Die Urankugel ergibt eine in alle Richtungen gleichmäßig starke Abschirmung des Strahles, wenn dieser bis in den Kugelmittelpunkt zurückgefahren ist. Der vor den Kanalausgang befindliche zylindrische Teil aus Wolframpulver dient zum Abschirmen des Kanalausgangs und nimmt zu diesem Zweck den verwundenen Kanal auf, so daß auch in diesem Bereich eine sichere Abschirmung gewährleistet ist.The shielding body can at least partially consist of tungsten powder compressed with a heat-resistant binder; it can also consist, for example, of an essentially spherical part made of a high-density material, for example depleted uranium with an essentially diametrically extending channel and a channel located in front of the channel exit essential cylindrical part consist of tungsten powder compressed with a heat-resistant binder with the axially offset and spatially twisted channel arranged therein. The uranium ball provides a uniform shielding of the beam in all directions when it has moved back to the center of the ball. The cylindrical part made of tungsten powder in front of the duct outlet serves to shield the duct outlet and for this purpose receives the twisted duct, so that reliable shielding is also ensured in this area.

Da das zylindrische Teil aus mit einem hitzebeständigen Bindemittel verdichtetem Wolframpulver besteht, läßt sich der verwundene Kanal in einfacher Weise aus einem in das Wolframpulver eingebetteten, in eine diametrale Bohrung in der Urankugel hineinragenden Rohr herstellen.Since the cylindrical part consists of tungsten powder compressed with a heat-resistant binder, the twisted channel can be produced in a simple manner from a tube embedded in the tungsten powder and protruding into a diametrical bore in the uranium ball.

Um eine fehlerhafte Bedienung auszuschließen, kann das erfindungsgemäße Gammagraphie-Gerät eine Sicherheitsverriegelung gegen ein Ausfahren des Strahlers ohne angeschlossenen Ausfahrschlauch und/oder ohne angeschlossene Fernbedienung für den Strahler versehen sein.In order to rule out incorrect operation, the gammagraphy device according to the invention can be provided with a safety lock to prevent the radiator from being extended without a connected extension hose and / or without a connected remote control for the radiator.

Im einzelnen kann die Sicherheitsverriegelung aus einem quer zur Kanalachse verschiebbaren Verriegelungsschieber für den Strahler in seiner eingefahrenen Stellung, einem axial verschiebbaren, mit der Bewegung des Strahlers kuppelbaren, den Verriegelungsschieber in der eingefahrenen Stellung des Strahlers freigebenden Verriegelungsstein und wenigstens einem durch die Kupplung des Ausfahrschlauchs betätigten, den Verriegelungsschieber bei nicht gekuppeltem Ausfahrschlauch freigebenden Riegel bestehen.Specifically, the safety lock can consist of a locking slide for the spotlight which can be displaced transversely to the channel axis, an axially displaceable locking block which can be coupled to the movement of the spotlight and which releases the locking slide in the retracted position of the spotlight, and at least one locking block actuated by the coupling of the extension tube , the locking slide with the release hose not released, the lock.

Der Verriegelungsschieber kann eine Querbohrung für den Verriegelungsstein und wenigstens eine Querbohrung für den Riegel sowie einen mit einer Einkerbung in einem Betätigungsrohr zusammenwirkenden Absatz in der Bohrung für den Verriegelungsstein aufweisen.The locking slide can have a transverse bore for the locking stone and at least one transverse bore for the bolt as well as a shoulder in the bore for the locking stone which interacts with a notch in an actuating tube.

Des weiteren kann der Strahler an einem durch den Verriegelungsstein und das Betätigungsrohr geführten Kabel angeordnet und in einem gegenüber der Bohrung im Betätigungsrohr etwas verdickten Kopf angeordnet sein. Beim Zurückfahren des Strahlers wird auf diese Weise das Betätigungsrohr axial verschoben, nimmt den Verriegelungsstein mit und bewirkt ein Verriegeln des Strahlers durch den Verriegelungsschieber.Furthermore, the radiator can be arranged on a cable guided through the locking stone and the actuating tube and can be arranged in a head that is somewhat thickened relative to the bore in the actuating tube. When driving back the actuating tube of the spotlight is axially displaced in this way, takes the locking block with it and causes the spotlight to be locked by the locking slide.

Gleichzeitig wird damit gewährleistet und angezeigt, daß der Strahler eingefahren ist.At the same time, this ensures and indicates that the spotlight is retracted.

Die Kupplung für die Fernbedienung kann entgegengesetzt zur Kupplung für den Ausfahrschlauch am Gammagraphie-Gerät angeordnet sein; sie betätigen axial verschiebbare, mit dem Verriegelungsschieber zusammenwirkende Verriegelungsstifte über Kupplungsmuffen im Sinne eines Entriegelns bei ordnungsgemäß gekuppeltem Ausfahrschlauch und gekuppelter bedienung.The coupling for the remote control can be arranged opposite to the coupling for the extension hose on the gammagraphy device; they actuate axially displaceable locking pins, which interact with the locking slide, via coupling sleeves in the sense of unlocking when the extension tube is properly coupled and the operator is coupled.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des näheren erläutert. In der Zeichnung zeigen:

Fig. 1
einen Querschnitt durch einen erfindungsgemäßen Abschirmkörper für ein Gammagraphie-Gerät;
Fig. 2
einen Längsschnitt durch das zylindrische Teil aus verdichtetem Wolframpulver;
Fig. 3
einen Querschnitt durch das zylindrische Teil;
Fig. 4
einen gegenüber der Fig. 2 um 90° versetzten Längsschnitt durch das zylindrische Teil;
Fig. 5
einen schematischen Längsschnitt durch ein Gammagraphie-Gerät im verriegelten Zustand;
Fig. 6
einen schematischen Längsschnitt durch das Gammagraphie-Gerät im entriegelten Zustand mit zurückgefahrenem Strahler; und
Fig. 7
einen schematischen Längsschnitt durch das Gammagraphie-Gerät im entriegelten Zustand mit vorgefahrenem Strahler.
The invention is explained below with reference to an embodiment shown in the drawing. The drawing shows:
Fig. 1
a cross section through a shielding body according to the invention for a gammagraphy device;
Fig. 2
a longitudinal section through the cylindrical part made of compressed tungsten powder;
Fig. 3
a cross section through the cylindrical part;
Fig. 4
a 90 ° offset with respect to FIG. 2 longitudinal section through the cylindrical part;
Fig. 5
a schematic longitudinal section through a gammagraphy device in the locked state;
Fig. 6
a schematic longitudinal section through the gammagraphy device in the unlocked state with the radiator retracted; and
Fig. 7
a schematic longitudinal section through the gammagraphy device in the unlocked state with the radiator moved forward.

Das erfindungsgemäße Gammagraphie-Gerät weist ein zylindrisches Gehäuse 1 auf, das an beiden Enden mit einer Stirnplatte 2 verschlossen ist. Im mittleren Bereich des Gehäuses 1 ist eine Zwischenplatte 3 angeordnet. Das Gammagraphie-Gerät ist mit einem Traggriff 4 und einem Fuß 5 versehen, um es problemlos handhaben zu können.The gammagraphy device according to the invention has a cylindrical housing 1 which is closed at both ends by an end plate 2. An intermediate plate 3 is arranged in the central region of the housing 1. The Gammagraphie device is provided with a carrying handle 4 and a foot 5 in order to be able to handle it easily.

Zwischen einer der Stirnplatten 2 und der Zwischenplatte 3 ist ein aus abgereichertem Uran bestehendes kugelförmiges Teil 6 eines Abschirmkörpers 23 angeordnet. Die Urankugel 6 besitzt zylindrische Fortsätze 7, die in entsprechende Ansätze der Stirnplatte 2 und der Zwischenplatte 3 eingreifen und die Urankugel 6 halten. Zwischen den zylindrischen Fortsätzen 7 erstreckt sich eine diametrale Bohrung aus einem bis zum Mittelpunkt der Urankugel 6 reichenden Teil 8 kleineren und einem Teil 9 größeren Durchmessers. An dem zylindrischen Fortsatz 7 mit der diametralen Bohrung 9 größeren Durchmessers schließt sich ein zylindrisches Teil 10 des Abschirmkörpers 23 an, das aus einem Rohrstück 11 aus mit einem hitzebeständigen Bindemittel verdichtetem Wolframpulver 12 besteht. Das Rohrstück 11 ist mit der Zwischenplatte 3 und der Stirnplatte 2 verschraubt. In das Wolframpulver 12 ist ein schraubenförmig gebogenes Rohr 13 eingebettet, das als Kanal 37 zum Ausfahren eines Gammastrahlers 18 dient. Ein Ende des Rohrs 13 ragt aus dem zylindrischen Teil 10 heraus und in die Bohrung 9 größeren Durchmessers in der Urankugel 6 hinein. Auf diese Weise geht der Kanal 37 direkt in die diametrale Bohrung 8 kleineren Durchmessers in der Urankugel 6 über.Between one of the end plates 2 and the intermediate plate 3, a spherical part 6 of a shielding body 23 made of depleted uranium is arranged. The uranium ball 6 has cylindrical extensions 7 which engage in corresponding approaches of the end plate 2 and the intermediate plate 3 and hold the uranium ball 6. Between the cylindrical extensions 7, a diametrical bore extends from a part 8 of smaller diameter and a part 9 of larger diameter reaching to the center of the uranium ball 6. A cylindrical part 10 of the shielding body 23 adjoins the cylindrical extension 7 with the diametrical bore 9 of larger diameter, which consists of a tube piece 11 made of tungsten powder 12 compressed with a heat-resistant binder. The pipe section 11 is screwed to the intermediate plate 3 and the end plate 2. In the tungsten powder 12, a helically bent tube 13 is embedded, which serves as a channel 37 for extending a gamma emitter 18. One end of the tube 13 protrudes from the cylindrical Part 10 out and into the hole 9 of larger diameter in the uranium ball 6. In this way, the channel 37 goes directly into the diametrical bore 8 of smaller diameter in the uranium ball 6.

Im Bereich der Stirnplatten 2 sind eine Kupplung 14 für einen Ausfahrschlauch mit einer Kupplungsmuffe 15 und eine Kupplung 16 für eine Fernbedienung mit einer Kupplungsmuffe 17 angeordnet. Die im einzelnen nicht dargestellte Fernbedienung läßt sich über die Kupplung 16 mit einer gelenkigen Verbindung 20 mit einem in einem Strahlerhaltekopf 19 angeordneten Gammastrahler 18 kuppeln. Zu diesem Zweck reicht ein flexibles Kabel 21 der Fernbedienung bis in den Bereich der Kupplung 16 und läßt sich beim Verbinden der Kupplung 16 mit der gelenkigen Verbindung 20 kuppeln.In the area of the end plates 2, a coupling 14 for an extension hose with a coupling sleeve 15 and a coupling 16 for remote control with a coupling sleeve 17 are arranged. The remote control, not shown in detail, can be coupled via the coupling 16 with an articulated connection 20 to a gamma emitter 18 arranged in a radiator holding head 19. For this purpose, a flexible cable 21 of the remote control extends into the area of the coupling 16 and can be coupled to the articulated connection 20 when the coupling 16 is connected.

In der Bohrung 8 ist ein axial verschiebbares Betätigungsrohr 22 angeordnet, dessen Innendurchmesser groß genug ist, um ein axiales Verschieben der gelenkigen Verbindung 20 und des flexiblen Kabels 21 zu erlauben. Der Durchmesser des Strahlerhaltekopfes 19 ist jedoch so groß, daß dieser nicht in das Betätigungsrohr 22 hinein zurückgezogen werden kann.An axially displaceable actuating tube 22 is arranged in the bore 8, the inner diameter of which is large enough to allow the articulated connection 20 and the flexible cable 21 to be displaced axially. However, the diameter of the radiator holding head 19 is so large that it cannot be retracted into the actuating tube 22.

In den Fig. 2 bis 4 ist der Verlauf des Rohres 13 im zylindrischen Teil 10 in drei Schnitten dargestellt. Es ist ersichtlich, daß mit der räumlichen Verwindung des Rohres 13 und daraus folgend des Kanals 37 eine besondere Sicherheit gegen das Austreten von Gamma-Strahlen bei größtmöglicher Ausnutzung der Abschirmung gewährleistet ist.2 to 4, the course of the tube 13 in the cylindrical part 10 is shown in three sections. It can be seen that with the spatial twisting of the tube 13 and consequently the channel 37, a special security against the escape of gamma rays is ensured with the greatest possible use of the shielding.

Im Bereich der Kupplung 16 für die Fernbedienung ist ein quer zur Bewegungsrichtung des Gamma-Strahlers 18 verschiebbarer Verriegelungsschieber 24 angeordnet. Dieser Verriegelungsschieber wird, wie in Fig. 5 dargestellt, durch eine Druckfeder 25 in die dargestellte Stellung verschoben. In dieser Stellung ist der Gamma-Strahler 18 im Strahlerhaltekopf 19 gegen ein axiales Verschieben verriegelt, da weder eine Kupplung 14 für den Ausfahrschlauch noch eine Kupplung 16 für die Fernbedienung mit dem Gammagraphie-Gerät verbunden ist. Die Verriegelung ergibt sich dadurch, daß in dieser Stellung ein Verriegelungsstein 26 gegen die Wirkung einer Druckfeder 27 in eine Bohrung der Stirnplatte 2 verschoben ist, so daß der Verriegelungsschieber 24 in die dargestellte Lage gelangen kann. In dieser Lage sind sowohl ein Riegel in Gestalt eines Stiftes 28 als auch ein Riegel in Gestalt eines Stiftes 38 in entsprechende Bohrungen 33, 34 des Verriegelungsschiebers 24 eingerastet. Gleichzeitig hintergreift ein Absatz 36 in einer Querbohrung 32 im Verriegelungsschieber 24 eine Einkerbung 35 im Betätigungsrohr 22 und in der gelenkigen Verbindung 20 des Strahlerhaltekopfs 19; sie verhindert dadurch ein ungewolltes Heraustreten des Gamma-Strahlers 18 aus dem Kanal 37.In the area of the coupling 16 for the remote control, one can be moved transversely to the direction of movement of the gamma emitter 18 Locking slide 24 arranged. This locking slide is, as shown in Fig. 5, moved by a compression spring 25 in the position shown. In this position, the gamma radiator 18 is locked in the radiator holding head 19 against axial displacement, since neither a coupling 14 for the extension tube nor a coupling 16 for the remote control is connected to the gamma paragraph device. The locking results from the fact that in this position a locking block 26 is moved against the action of a compression spring 27 in a bore in the end plate 2, so that the locking slide 24 can get into the position shown. In this position, both a bolt in the form of a pin 28 and a bolt in the form of a pin 38 are engaged in corresponding bores 33, 34 of the locking slide 24. At the same time, a shoulder 36 engages behind a notch 35 in a transverse bore 32 in the locking slide 24 in the actuating tube 22 and in the articulated connection 20 of the radiator holding head 19; it thereby prevents the gamma emitter 18 from unintentionally coming out of the channel 37.

Werden nun, wie in Fig. 6 dargestellt, der Ausfahrschlauch über die Kupplung 14 und die Fernbedienung über die Kupplung 16 mit dem Gammagraphie-Gerät gekuppelt, so bewirken die Kupplungsmuffen 15 und 17 über einen Stift 31, einen Hebel 30 und eine Verbindung 29 das Zurückziehen des Riegels 28 und das Verschieben des Riegels 38, die damit aus den Bohrungen 33, 34 im Verriegelungsschieber 24 austreten. Nunmehr läßt sich der entriegelte Verriegelungsschieber 24 querverschieben, bis er in die in Fig. 6 dargestellte Lage gelangt. In dieser Lage fluchtet eine Querbohrung 32 im Verrlegelungsschieber 24 mit dem Verriegelungsstein 26, während der Absatz 36 aus dem Bereich der Einkerbung 35 in der gelenkigen Verbindung 20 und dem Betätigungsrohr 22 herausbewegt wird. Wird jetzt die gelenkige Verbindung 20 mittels des flexiblen Kabels 21 der Fernbedienung verschoben, gelangt der Verriegelungsstein 26 unter der Wirkung einer Druckfeder 27 in den Bereich der Querbohrung 32 und hält den Verriegelungsschieber 24 in der entriegelten Stellung fest. Der Gamma-Strahler 18 im Strahlerhalterkopf 19 läßt sich nunmehr mittels der gelenkigen Verbindung 20 und dem damit gekuppelten flexiblen Kabel 21 der Fernbedienung durch den Kanal 37 und die Kupplung 14 hindurch in den Ausfahrschlauch hineinbewegen, bis er in den Bereich gelangt, wo die zerstörungsfreie Werkstoffprüfung durchgeführt werden soll.If, as shown in FIG. 6, the extension hose is coupled to the gammagraphy device via the coupling 14 and the remote control via the coupling 16, the coupling sleeves 15 and 17 effect this by means of a pin 31, a lever 30 and a connection 29 Withdrawing the bolt 28 and moving the bolt 38, which thus emerge from the bores 33, 34 in the locking slide 24. Now the unlocked locking slide 24 can be moved laterally until it reaches the position shown in FIG. 6. In this position, a transverse bore 32 in the locking slide 24 is aligned with the locking block 26, while the shoulder 36 from the area of the notch 35 in the articulated connection 20 and the actuating tube 22 is moved out. If the articulated connection 20 is now moved by means of the flexible cable 21 of the remote control, the locking block 26 comes under the action of a compression spring 27 into the region of the transverse bore 32 and holds the locking slide 24 in the unlocked position. The gamma emitter 18 in the emitter holder head 19 can now be moved by means of the articulated connection 20 and the flexible cable 21 of the remote control coupled therewith through the channel 37 and the coupling 14 into the extension tube until it reaches the area where the non-destructive material testing takes place to be carried out.

Nach Beendigung der Prüfung läßt sich der Gamma-Strahler 18 in umgekehrter Weise in den Abschirmkörper 23 zurückfahren, wonach sich wieder eine Verriegelung entsprechend Fig. 5 ergibt. In diesem Zustand lassen sich die Kupplungen 14, 15 vom Gammagraphie-Gerät lösen, das sich nunmehr an einen anderen Einsatzort transportieren läßt.After completion of the test, the gamma emitter 18 can be moved back into the shielding body 23 in the reverse manner, after which there is again a locking according to FIG. 5. In this state, the couplings 14, 15 can be released from the gammagraphy device, which can now be transported to another location.

Claims (4)

  1. Shielding body (23) of a gammagraphy device having a helically twisted passage (37) therein for guidance of a travelling radiator (18).
  2. Shielding body according to claim 1, characterised in that it consists at least in part (10) of tungsten powder (12) consolidated by a heat resistant binder.
  3. Shielding body according to claim 2, characterised by including a substantially spherical part (6) of depleted uranium with a substantially diametrally extending passage (8, 9) therein and a substantially cylindrical part (10), located in front of the mouth of said passage, consisting of tungsten powder (12) consolidated with a heat resistant binder and having the helically twisted passage (37) therein.
  4. Shielding body according to claim 3, characterised in that the helically twisted passage (37) comprises a tube (13) projecting into a diametral bore (9) in the uranium sphere (6).
EP19920105745 1991-05-16 1992-04-03 Shielding system, in particular for a gammagraphy device Expired - Lifetime EP0513515B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4116022 1991-05-16
DE19914116022 DE4116022C2 (en) 1991-05-16 1991-05-16 Shielding body of a gammagraphy device

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EP0513515A2 EP0513515A2 (en) 1992-11-19
EP0513515A3 EP0513515A3 (en) 1993-12-01
EP0513515B1 true EP0513515B1 (en) 1997-07-16

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DE102011077637A1 (en) * 2011-06-16 2012-12-20 Endress + Hauser Gmbh + Co. Kg Source holder
CA3039810C (en) * 2016-10-11 2021-05-18 Source Production & Equipment Co., Inc. Delivering radiation

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US3039000A (en) * 1956-07-14 1962-06-12 Schwarzkopf Dev Co Radiation shield structures and their production
US3593594A (en) * 1968-10-04 1971-07-20 Technical Operations Inc Apparatus for manipulating radioactive material to and from a storage unit
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DE3313857A1 (en) * 1983-04-16 1984-10-25 Sauerwein, Kurt, Dr., 5657 Haan PIPE DIVERTER
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DE4116022C2 (en) 1995-03-23
DE4116022A1 (en) 1992-11-19
EP0513515A3 (en) 1993-12-01
EP0513515A2 (en) 1992-11-19

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