DE2446381A1 - Medical gamma ray source with uranium shielding - has protective coating resisting attack of shielding by nitrous gases - Google Patents

Medical gamma ray source with uranium shielding - has protective coating resisting attack of shielding by nitrous gases

Info

Publication number
DE2446381A1
DE2446381A1 DE19742446381 DE2446381A DE2446381A1 DE 2446381 A1 DE2446381 A1 DE 2446381A1 DE 19742446381 DE19742446381 DE 19742446381 DE 2446381 A DE2446381 A DE 2446381A DE 2446381 A1 DE2446381 A1 DE 2446381A1
Authority
DE
Germany
Prior art keywords
uranium
shielding
gamma ray
nitrous gases
nickel
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.)
Pending
Application number
DE19742446381
Other languages
German (de)
Inventor
Helmuth Ing Grad Haubold
Arnold Dipl Chem Dr Spang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19742446381 priority Critical patent/DE2446381A1/en
Publication of DE2446381A1 publication Critical patent/DE2446381A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/02—Selection of uniform shielding materials
    • G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
    • G21F1/085—Heavy metals or alloys
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/12—Laminated shielding materials

Abstract

A radition shield for surrounding a gamma ray source is made of uranium; the uranium surface is protected by a coating which resists attack from nitrous gases. Pref. coatings are: a quartz layer applied over the nicket coating of the uranium; a gold layer applied over the nickel coating; or aluminium, esp. eloxadised aluminium. Used as gamma ray sources for medicinal use. The corrosive attack of the uranium, which occurs even if it is nickel-coated, is found to be radiation-induced and to be favoured by high humidity. Its immediate cause is nitrous gases produced by radiolysis. Quartz must be applied under vacuum. Gold is applied electrolytically. Aluminium is also applied electrolytically, omitting the nickel coating.

Description

Strahlenschutzmantel aus Uran Die Erfindung bezieht sich auf einen Strahlenschutzmantel für eine Gammastrahlenquelle aus Uran und soll die Korrosionsanfälligkeit solcher Strahlenschutzmäntel vermindern. Radiation protection jacket made of uranium The invention relates to a Radiation protective jacket for a gamma ray source made of uranium and is intended to reduce susceptibility to corrosion reduce such radiation protection coats.

In der medizinischen Strahlenanwendung werden hoch angereicher-.In the medical application of radiation are highly enriched.

te Gammastrahlenquellen verwendet. Da solche Gammastrahlenquellen in der Strahlentherapie meist auf vorgegebenen Bahnen um einen auf einer Lagerungsplatte liegenden Patienten herumgeführt werden müssen, ist es erforderlich, den Strahlenschutzmantel für die Ganmastrahlenquellen so klein und handlich wie möglich zu gestalten. Erschwerend kommt hinzu, daß der Strahlenpegel bereits in urmittelbarer Nachbarschaft des Strahlenschutzmantels auf einen für das Bedienungspersonal zulässigen Wert reduziert sein muß. Aus diesen Erfordernissen heraus ist man bestrett, die der Gammastrahlen'quelle unmittelbar benachbarten Teile der Strahlenschutzverkleidung aus einem stark absorbierenden Schwerme-tall, wie z.B. Uran, anzufertigen. Dabei ist es bekannt, die aus Uran angefertigten Teile der Strahlenschutzverkleidung mit einer Nickelschicht zum Schutz der Uranoberfläche vor Korrosion zu versehen. Bei der Wartung von in Betrieb befindlichen Anlagen hat es sich jedoch immer wieder gezeigt, daß auch die vernickelten Oberflächen korrosiv angegriffen werden.te gamma ray sources used. Because such gamma ray sources in radiation therapy mostly on predetermined paths around one on a positioning plate lying patients must be led around, it is necessary to wear the radiation protection jacket for the Ganma radiation sources as small and handy as possible. Aggravating In addition, the radiation level is already in the immediate vicinity of the radiation protection jacket must be reduced to a value permissible for the operating personnel. From these Requirements are to be met, those of the source of gamma rays directly adjacent parts of the radiation protection cladding made of a highly absorbent To manufacture heavy metals such as uranium. It is known that those made from uranium Parts of the radiation protection cladding with a nickel layer to protect the uranium surface before To provide corrosion. In the maintenance of systems that are in operation, it has However, it has been shown time and again that the nickel-plated surfaces are also corrosive to be attacked.

Der Erfindung liegt die Aufgabe zugrunde, Maßnahmen gegen den korrosiven Angriff der aus Uran gefertigten Teile der Strahlenschutzverkleidung zu ergreifen. Aufgrund von langwierigen Versuchen konnte festgestellt werden, daß der korrosive Angriff strahleninduziert ist. Darüber hinaus zeigte es sich, daß er außerdem durch eine hohe relative Luftfeuchte begünstigt wird.The invention has for its object to take measures against the corrosive Attack the parts of the radiation protection cladding made of uranium. On the basis of lengthy tests it was found that the corrosive Attack is radiation-induced. In addition, it turned out that he was also through a high relative humidity is favored.

Bei einem Strahlenschutzmantel der eingangs genannten Art wurde daher erfindungsgemäß auf der Uranoberfläche eine gegen nitrose Gase beständige Schutzschicht aufgebracht. Es hat sich nämlich gezeigt, daß durch Radiolyse nitrose Gase entstehen, die für die Korrosion der Nickelschicht verantwortlich sind. Deshalb ist die Korrosion der Strahlenschutzverkleidung auch nur durch eine regen diese nitrosen Gase beständige Oberfläche zu verhindern.In the case of a radiation protection jacket of the type mentioned above, according to the invention a protective layer resistant to nitrous gases on the uranium surface upset. It has been shown that radiolysis produces nitrous gases, which are responsible for the corrosion of the nickel layer. That's why the corrosion The radiation protection cladding is resistant to these nitrous gases only through a rain To prevent surface.

Eine gegen nitrose Gase beständige Oberfläche erhält man, wenn man in Ausgestaltung der Erfindung die Schutzschicht aus einer auf der vernickelten Uranoberf]äche aufgebrachten Quarsschicht bestehen läßt. Die Aufbringung der Quarzschicht muß jedoch unter Vakuum erfolgen und. erfordert aufwendige Anlagen.A surface resistant to nitrous gases is obtained if one In an embodiment of the invention, the protective layer consists of one on the nickel-plated Uranium surface applied quars layer can exist. The application of the quartz layer however, must be done under vacuum and. requires complex systems.

In einer anderen Ausgestaltung der Erfindung kann die Schutzschicht aus einer auf der veraickelten Uranoberfläche aufgebrauen Goldschicht bestehen. Damit ist der weitere Vorteil verbunden, daß die Schutzschicht galvanisch aufgetragen werden Kann.In another embodiment of the invention, the protective layer consist of a gold layer roughened on the coated uranium surface. This has the further advantage that the protective layer is applied galvanically can be.

Eine besonders zweckmäßige Ar-t, Uran-teile gegen nitrose Gase zu schützen, ist es, sie mit einer Aluminiumschicht zu versehen. Diese Aluminiumschicht läßt sich galvanisch aufbringen.A particularly useful way to protect uranium parts against nitrous gases protect them, is to provide them with a layer of aluminum. These The aluminum layer can be applied galvanically.

Sie hat den weiteren Vorteil, daß sie die Nickelschicht entbehrlich macht. Sie eröffnet darüber hinaus die Möglichkeit, in einem weiteren Arbeitsgang oxydiert zu werden. Die dabei entstehende Eloxalschicht ist nicht nur gegen nitrose Gase stabil, sondern außerdem sehr widerstandsfähig gegen Abrieb.It has the further advantage that the nickel layer can be dispensed with power. It also opens up the possibility of a further work step to be oxidized. The resulting anodized layer is not only against nitrous oxide Gases stable, but also very resistant to abrasion.

Dieser Eigenschaft kommt dann besondere Bedeutung zu, wenn, wie z.B. beim Auswechseln der Strahlenquelle, Teile gegeneinander verschoben werden müssen.This property is of particular importance when, e.g. When changing the radiation source, parts have to be moved against each other.

Claims (5)

PatentansprücheClaims 1. Strahlenschutzmantel für eine Gammastrahlenquelle aus Uran, d a d u r c h g e k e n n z e i c h n e t , daß auf der Uranoberfläche eine gegen nitrose Gase beständige Schutzschicht aufgebracht ist. 1. Radiation protection jacket for a gamma radiation source made of uranium, d a d u r c h g e k e n n n z e i c h n e t that on the uranium surface a counter protective layer resistant to nitrous gases is applied. 2. Steahlenschutzmantel1 nach Anspruch 1, dadurch ge -kennzeichnet, daß die Schutzschicht aus einer auf der vernickelten Uranoberfläche aufgebrachten Quarzschicht besteht.2. Steahlenschutzmantel1 according to claim 1, characterized -characterized, that the protective layer of a applied to the nickel-plated uranium surface Quartz layer. 3. Strahlenschutzmantel nach Anspruch 1, dadurch gekennzeichnet, daß die Schutzschicht aus einer auf der vernickelten Uranoberfläche aufgebrachten Goldschicht besteht. 3. Radiation protection jacket according to claim 1, characterized in that that the protective layer of a applied to the nickel-plated uranium surface Gold layer. 4. Strahlenschutzmantel nach Anspruch 1, dadurch gekennzeichnet, daß die Schutzschicht aus Aluminium besteht. 4. Radiation protection jacket according to claim 1, characterized in that that the protective layer consists of aluminum. 5. Strahlenschutzmantel nach Anspruch 4, dadurch gekennzeichnet, daß die Aluminiumschicht eloxiert ist. 5. Radiation protection jacket according to claim 4, characterized in that that the aluminum layer is anodized.
DE19742446381 1974-09-27 1974-09-27 Medical gamma ray source with uranium shielding - has protective coating resisting attack of shielding by nitrous gases Pending DE2446381A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19742446381 DE2446381A1 (en) 1974-09-27 1974-09-27 Medical gamma ray source with uranium shielding - has protective coating resisting attack of shielding by nitrous gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742446381 DE2446381A1 (en) 1974-09-27 1974-09-27 Medical gamma ray source with uranium shielding - has protective coating resisting attack of shielding by nitrous gases

Publications (1)

Publication Number Publication Date
DE2446381A1 true DE2446381A1 (en) 1976-04-15

Family

ID=5926988

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19742446381 Pending DE2446381A1 (en) 1974-09-27 1974-09-27 Medical gamma ray source with uranium shielding - has protective coating resisting attack of shielding by nitrous gases

Country Status (1)

Country Link
DE (1) DE2446381A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146778A2 (en) * 1983-12-22 1985-07-03 Nukem GmbH Container for final radioactive waste disposal
WO1996036972A1 (en) * 1995-05-16 1996-11-21 Metallveredlung Gmbh & Co. Kg Process for producing shielding components to absorb the neutrons generated in the nuclear reaction of radioactive materials

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146778A2 (en) * 1983-12-22 1985-07-03 Nukem GmbH Container for final radioactive waste disposal
EP0146778A3 (en) * 1983-12-22 1985-12-27 Nukem Gmbh Container for final radioactive waste disposal
WO1996036972A1 (en) * 1995-05-16 1996-11-21 Metallveredlung Gmbh & Co. Kg Process for producing shielding components to absorb the neutrons generated in the nuclear reaction of radioactive materials

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