US3567943A - Radioactive plating for radioactive foils - Google Patents

Radioactive plating for radioactive foils Download PDF

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Publication number
US3567943A
US3567943A US654328A US3567943DA US3567943A US 3567943 A US3567943 A US 3567943A US 654328 A US654328 A US 654328A US 3567943D A US3567943D A US 3567943DA US 3567943 A US3567943 A US 3567943A
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US
United States
Prior art keywords
radioactive
gold
foil
plating
core
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
US654328A
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English (en)
Inventor
Clarence W Wallhausen
Walter F Buck
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NUCLEAR RADIATION DEVELOPMENTS
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NUCLEAR RADIATION DEVELOPMENTS
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Filing date
Publication date
Application filed by NUCLEAR RADIATION DEVELOPMENTS filed Critical NUCLEAR RADIATION DEVELOPMENTS
Application granted granted Critical
Publication of US3567943A publication Critical patent/US3567943A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • G21G4/06—Radioactive sources other than neutron sources characterised by constructional features

Definitions

  • the field to which this invention pertains is that of radioactive foils and similar products comprising a radioactive core on which is disposed a metallic sealing layer as a safeguard against contamination.
  • the improvement of the invention resides in a protective plating disposed over the sealing layer comprising an alloy of gold and from 0.10 to 25 .0 per cent by weight of cobalt, cadmium, nickel, copper or silver.
  • Platings of palladium not only tend to flake from the foil but they are difficult to deposit in uniformly thick layers. Also, chipping and cracking of palladium platings is not uncommon when the foil is out.
  • the initial steps in fabricating the radioactive product of the invention in the form of a foil are known in this art.
  • the radioactive core is formed, for example, by mixing or coprecipitating a radioactive salt and a gold powder. This particulate radioactive mixture is then compressed into a solid block by heat and pressure and rolled into a radioactive sheet.
  • Gold foil may be laminated to each side of the radioactive sheet by a rolling process and a backing foil of silver or gold is usually laminated in the same manner to contribute strength. Together these components form a foil which may have an overall thickness of about .005 inch with the silver backing being the thickest of the layers.
  • foil strip of laminated construction having an interior radioactive layer covered on each side with a sealing layer of gold with a relatively heavy surfacing of silver on one side of the foil to serve as a reinforcing backing element.
  • Such foils find widespread industrial use in static eliminators, as discharge-stabilizing elements in electron tubes and as radiation sources in beta and gamma gauges, in photometry, emergency marking devices, and so on.
  • foils of this sort are more satisfactory if a plating of a protective metal is electrodeposited over its exposed surface, particularly to render the otherwise exposed gold and silver of the foil resistant to abrasion, corrosion, oxidation and other forms of chemical or physical attack which results in removal of radioactive material.
  • Palladium has been the most common plating metal for guarding against contamination of this: sort.
  • the present invention is predicated on the discovery that a substantial improvement over palladium plating can be achieved by employing as the plating metal an alloy of gold and from 0.10 to 250 per cent by weight of cobalt, cadmium, nickel, copper or silver.
  • the plating alloy should consist ofgold and from 0.1 to 4.0 per cent by weight of cobalt or cadmium.
  • These preferred plating alloys exhibit a hardness range comparable to that'of palladium.
  • Cobalt and cadmium in the small amounts noted above are preferable. in the gold plating alloy because they do not chip, crack, or peel and they are exceptionally resistant to corrosion.
  • radioactive core layer 10 is enveloped on both surfaces by plating layers 12 and 14 of the gold alloy of the present invention and backing foil 16 is laminated to .the surface of protective plating 14.
  • gold foil sealing films 1:8 and 20 forming a first sealing layer about radioactive core 10.
  • the palladium plating becomes visibly scratched and in some places broken through whereas the gold alloy plating is simply worn down smoothly.
  • the gold alloy plating tends to seal off the exposed cut edge more satisfactorily than the conventional palladium plating and hence permits less radioactive contamination.
  • the reason for this is the markedly superior malleability of the gold alloy as compared to palladium which permits it to deform over the cut edge and decrease the exposed area of radioactive material.
  • the palladium plated foil evidences a loosening of its layers while the gold alloy plated foil resists the effects quite well.
  • the gold alloy plating maybe applied to either or both sides of the foil whether or not a silver backing layer is employed.
  • platinum may be used instead of gold or silver in the inner layers of the foil, but not of course for the improved protecting plating.
  • an improved protective plating disposed over said core comprising an alloy of gold and from about 0.10 to 25.0 per cent by weight of an element selected from the group consisting of cobalt, cadmium, nickel, copper and silver.
  • a radioactive product according to claim 1 wherein the plating alloy consists essentially of gold and from 0.1 to 4.0 per cent by weight of cobalt or cadmium.
  • a radioactive product according to claim 1 wherein a metallic sealing layer is disposed over the core and the protective plating is disposed over the sealing layer.
  • a radioactive product according to claim 3 in the form of a foil wherein the core is a sheet and the sealing layerris laminated to and covers the opposite sides of the core sheet,
  • a radioactive product according to claim 4 which also includes a silver or gold backing layer laminated to and reinforcing the remainder of foil.
  • a radioactive foil comprising a radioactive core sheet on the opposite sides of which are laminated at least one gold sealing layer and a silver or gold backing layer, an improved protective plating covering the exterior of the foil comprising an alloy of gold and from 0.1 to 4.0 percent by weight of cobalt or cadmium.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Laminated Bodies (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
US654328A 1967-07-19 1967-07-19 Radioactive plating for radioactive foils Expired - Lifetime US3567943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US65432867A 1967-07-19 1967-07-19

Publications (1)

Publication Number Publication Date
US3567943A true US3567943A (en) 1971-03-02

Family

ID=24624404

Family Applications (1)

Application Number Title Priority Date Filing Date
US654328A Expired - Lifetime US3567943A (en) 1967-07-19 1967-07-19 Radioactive plating for radioactive foils

Country Status (8)

Country Link
US (1) US3567943A (enrdf_load_stackoverflow)
JP (1) JPS4940531B1 (enrdf_load_stackoverflow)
BE (1) BE716234A (enrdf_load_stackoverflow)
CH (1) CH483701A (enrdf_load_stackoverflow)
DE (1) DE1764365B1 (enrdf_load_stackoverflow)
ES (1) ES354445A1 (enrdf_load_stackoverflow)
FR (1) FR1567763A (enrdf_load_stackoverflow)
GB (1) GB1187158A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710537A (en) * 1969-03-28 1973-01-16 Cerberus Ag Method for sealing the cutting or separation surfaces of radioactive foils
US3787321A (en) * 1971-07-01 1974-01-22 Atomic Energy Commission Californium-palladium metal neutron source material
US3873651A (en) * 1972-05-12 1975-03-25 Atomic Energy Commission Freeze drying method for preparing radiation source material
US4119847A (en) * 1976-10-28 1978-10-10 Schlumberger Technology Corporation Calibrator for radioactivity well logging tools
US6475644B1 (en) 1998-11-18 2002-11-05 Radiovascular Systems, L.L.C. Radioactive coating solutions methods, and substrates
US6508754B1 (en) 1997-09-23 2003-01-21 Interventional Therapies Source wire for radiation treatment
US6876712B1 (en) 1994-06-08 2005-04-05 Interventional Therapies, L.L.C. Flexible source wire for localized internal irradiation of tissue
CN113436775A (zh) * 2021-06-23 2021-09-24 中国核动力研究设计院 一种无衬底超薄镍-63放射源的制备方法

Family Cites Families (4)

* 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
DE1023155B (de) * 1956-06-22 1958-01-23 Chininfabrik Braunschweig Buch Radioaktive Perle
DE1016855B (de) * 1956-07-27 1957-10-03 Chininfabrik Braunschweig Buch Verfahren zur Herstellung geschlossener radioaktiver Praeparate
DE1222591B (de) * 1960-12-24 1966-08-11 Akad Wissenschaften Ddr Verfahren zur Herstellung geschlossener radioaktiver Praeparate mit Thallium 204

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710537A (en) * 1969-03-28 1973-01-16 Cerberus Ag Method for sealing the cutting or separation surfaces of radioactive foils
US3787321A (en) * 1971-07-01 1974-01-22 Atomic Energy Commission Californium-palladium metal neutron source material
US3873651A (en) * 1972-05-12 1975-03-25 Atomic Energy Commission Freeze drying method for preparing radiation source material
US4119847A (en) * 1976-10-28 1978-10-10 Schlumberger Technology Corporation Calibrator for radioactivity well logging tools
US6876712B1 (en) 1994-06-08 2005-04-05 Interventional Therapies, L.L.C. Flexible source wire for localized internal irradiation of tissue
US6508754B1 (en) 1997-09-23 2003-01-21 Interventional Therapies Source wire for radiation treatment
US6475644B1 (en) 1998-11-18 2002-11-05 Radiovascular Systems, L.L.C. Radioactive coating solutions methods, and substrates
CN113436775A (zh) * 2021-06-23 2021-09-24 中国核动力研究设计院 一种无衬底超薄镍-63放射源的制备方法

Also Published As

Publication number Publication date
BE716234A (enrdf_load_stackoverflow) 1968-11-04
CH483701A (fr) 1969-12-31
DE1764365B1 (de) 1971-05-19
JPS4940531B1 (enrdf_load_stackoverflow) 1974-11-02
GB1187158A (en) 1970-04-08
FR1567763A (enrdf_load_stackoverflow) 1969-05-16
ES354445A1 (es) 1970-06-01

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