US3710537A - Method for sealing the cutting or separation surfaces of radioactive foils - Google Patents

Method for sealing the cutting or separation surfaces of radioactive foils Download PDF

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Publication number
US3710537A
US3710537A US00019241A US3710537DA US3710537A US 3710537 A US3710537 A US 3710537A US 00019241 A US00019241 A US 00019241A US 3710537D A US3710537D A US 3710537DA US 3710537 A US3710537 A US 3710537A
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US
United States
Prior art keywords
foil
radioactive
melting point
cutting
noble metal
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 - Lifetime
Application number
US00019241A
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English (en)
Inventor
G Purt
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.)
Cerberus AG
Original Assignee
Cerberus 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 Cerberus AG filed Critical Cerberus AG
Application granted granted Critical
Publication of US3710537A publication Critical patent/US3710537A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
    • B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
    • B23K35/3006—Ag as the principal constituent
    • 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
    • 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
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G4/00—Radioactive sources
    • G21G4/04—Radioactive sources other than neutron sources

Definitions

  • the present invention relates to an improved method for sealing or closing the cutting or separation surfaces of radioactive foils which are covered at both sides with metallic non-active protective layers.
  • Radioactive foils are advantageously employed, in all instances, where there is desired a surface contact radioactive radiation.
  • radioactive foils are used which employ for the active material AmO RaS, RaSO or similar substances, in a thin surface contact form.
  • the surfaces of these foils are covered with a thin metallic protective layer, for instance formed of gold, silver, palladium, or other noble metals as well as combinations of such layers, in order to protect against contamination and damage.
  • a metallic supporting surface for instance formed of silver.
  • these foils are then cut or stamped to the desired size, with the result that at the end or side surfaces the radioactive material is open to the surroundings, resulting in a contamination danger.
  • Another, more specific object of the present invention is to provide a positive and economical technique or method for covering the cutting or separation surfaces of radioactive foils which are covered at both sides with a metallic layer of material in order to protect against radioactive contamination.
  • the inventive method contemplates the steps of heating the radioactive foil for at least 10 minutes to at least 60 percent of the absolute temperature of the melting point of the lowest melting metal from which the protective-or support layer for the foil is formed.
  • FIG. 1 is a longitudinal sectional view of an example of a radioactive foil which is cut from stripor bandshaped material and the cutting edges of which have been closed according to the inventive method;
  • FIG. 2 is a cross-sectional view of the structure shown in FIG. 1.
  • the invention relies upon the fact that at approximately 60 percent of the absolute temperature of the melting point of a metal the surface mobility of the metal atoms is already so large that an appreciable migration of material occurs along the surface. With sufficiently long heating time, so much inactive material surface migrates or moves to the cutting edges that there results a solid, uniform and sufficiently thick protective layer. Since the melting point of radioactive compounds is generally greater than the melting point of the noble metals used as the protective-or support layers, with the inventive process, the radioactive materials are not influenced or adversely affected.
  • FIGS. 1 and 2 depict in longitudinal section and in cross-sectional view, respectively, an exemplary embodiment of radioactive foil which has been cut from stripor band-shaped material Le. a laminate formed of the radioactive foil bonded between the covering layers and the cutting or separation edges of which have been sealed according to the inventive method.
  • a core 1 consisting of americium oxide embedded in gold is covered at one side or face with a gold layer 2 and at the other side or face with a silver layer 3.
  • the layer thicknesses amount to only several (microns i.e. 1/l000mm.).
  • the protective layers 2 and 3 extend past the active core 1 and can be tightly closed very easily, for instance by rolling.
  • the active material at the cutting or separation surfaces appears at the surface.
  • silver material migrates from the support layer 3 to the cutting edges that the latter are covered with a thin silver layer 4, as shown, which effectively prevents contamination of the surroundings.
  • radioactive preparations for instance substantially ring-shaped or circularshaped foils, which have been stamped out of radioactive bands covered at both sides.
  • a method of covering the cutting or separation surfaces of a radioactive foil covered at each side with a respective layer of material formed of at least one noble metal having a melting point lower than the melting point of said radioactive foil in order to protect against radioactive contamination comprising the step of heating the radioactive foil for at least ten minutes to a temperature from 60 percent of the absolute temperature of the melting point of that one of said noble metals having the lowest melting point to below the melting point of said noble metal.
  • a method of sealing the cut end surfaces of a radioactive foil laminated between a pair of covering layers comprising the steps of providing a laminate formed of a radioactive foil bonded to each side between a respective covering layer of material formed of at least one noble metal having a melting point lower than the melting point of said radioactive foil, cutting the laminate into a desired size and shape to thereby form exposed cut end surfaces of the radioactive foil, and sealing such cut end surfaces of the radioactive foil to protect against contamination by heating the laminate for at least ten minutes in order to raise the temperature of the radioactive foil to a value which is from 60% of the absolute temperature of the melting point of the noble metal of the covering layer possessing the lowest melting point material to below the melting point of said noble metal to cause surface migration of such lowest melting point noble metal towards the cut end surfaces of the radioactive foil, and depositing through such surface migration the migrated material of the lowest melting point noble metal about such cut end surfaces of the radioactive foil to seal the latter so as to prevent contamination.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Laminated Bodies (AREA)
  • Ceramic Products (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
US00019241A 1969-03-28 1970-03-13 Method for sealing the cutting or separation surfaces of radioactive foils Expired - Lifetime US3710537A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH474669A CH486106A (de) 1969-03-28 1969-03-28 Verfahren zum Verschliessen der Schnittflächen radioaktiver Folien

Publications (1)

Publication Number Publication Date
US3710537A true US3710537A (en) 1973-01-16

Family

ID=4281789

Family Applications (1)

Application Number Title Priority Date Filing Date
US00019241A Expired - Lifetime US3710537A (en) 1969-03-28 1970-03-13 Method for sealing the cutting or separation surfaces of radioactive foils

Country Status (5)

Country Link
US (1) US3710537A (de)
JP (1) JPS4928880B1 (de)
CH (1) CH486106A (de)
DE (1) DE2011328A1 (de)
GB (1) GB1249789A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3833843B2 (ja) * 1999-04-06 2006-10-18 Ｎｅｃディスプレイソリューションズ株式会社 画像補正方法及び画像補正装置並びに陰極線管ディスプレイ装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476644A (en) * 1947-09-27 1949-07-19 United States Radium Corp Radioactive metallic foil products
US3115702A (en) * 1959-11-12 1963-12-31 Johnson Matthey Co Ltd Production of composite metal sheet or strip
US3188732A (en) * 1960-01-14 1965-06-15 Westinghouse Electric Corp Diffusion-bonding of metal members
US3478416A (en) * 1967-02-15 1969-11-18 North American Rockwell Bonding of beryllium members
US3567943A (en) * 1967-07-19 1971-03-02 Nuclear Radiation Developments Radioactive plating for radioactive foils

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476644A (en) * 1947-09-27 1949-07-19 United States Radium Corp Radioactive metallic foil products
US3115702A (en) * 1959-11-12 1963-12-31 Johnson Matthey Co Ltd Production of composite metal sheet or strip
US3188732A (en) * 1960-01-14 1965-06-15 Westinghouse Electric Corp Diffusion-bonding of metal members
US3478416A (en) * 1967-02-15 1969-11-18 North American Rockwell Bonding of beryllium members
US3567943A (en) * 1967-07-19 1971-03-02 Nuclear Radiation Developments Radioactive plating for radioactive foils

Also Published As

Publication number Publication date
DE2011328A1 (de) 1970-10-08
JPS4928880B1 (de) 1974-07-30
GB1249789A (en) 1971-10-13
CH486106A (de) 1970-02-15

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