US3047434A - Solutions and methods for radioactive decontamination - Google Patents
Solutions and methods for radioactive decontamination Download PDFInfo
- Publication number
- US3047434A US3047434A US724501A US72450158A US3047434A US 3047434 A US3047434 A US 3047434A US 724501 A US724501 A US 724501A US 72450158 A US72450158 A US 72450158A US 3047434 A US3047434 A US 3047434A
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- United States
- Prior art keywords
- solution
- decontamination
- radioactive
- solutions
- acetic acid
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Classifications
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- 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
- G21F9/002—Decontamination of the surface of objects with chemical or electrochemical processes
Definitions
- This invention relates to solutions and methods for radioactive decontamination.
- Radioactive contaminants occur as unstable forms of the elements which in practical situations may be found in pure form but are usually found mixed in any of a wide variety of soils. Effective decontamination involves both stabilization and physical removal of the radioactive contaminant.
- An object of the invention is to provide improved solutions and methods for achieving this result.
- Another object is to provide highly effective solutions for decontamination when the radioactive contaminant is specifically identified; but the provision of solutions which are very effective evenvwhen the radioactive contaminant is not known, is also an object.
- Another object of the invention is to provide a solution, for general application to the problem of decontamination, sufiiciently effective to warrant its use for average cases, for those cases in which a variety of radioactive substances are present, and for first decontamination in preparation for specific contamination in special cases.
- Another important object is to provide a solution which is sufliciently inexpensive to make practical the decontamination of inexpensive hand tools such as pliers, screwdrivers, and the like which now must be disposed of, often after only a single usage.
- a radioactive contaminant comprising a mixture of a detergent liquid, an ion exchange agent soluble in said liquid to form ions charged oppositely of the radioactive contaminant, and adsorbent solids distributed in the liquid.
- a radioactive contaminant comprising a mixture of a detergent liquid, an ion exchange agent soluble in said liquid to form ions charged oppositely of the radioactive contaminant, and adsorbent solids distributed in the liquid.
- the detergent serves as the vehicle by which the exchange agent and adsorbent may move into association with one another and the surface to be cleaned, while the forces exerted by the substances accounts for that movement. Provision for cavitation action aids the movement and intermixing of the constituents of the solvent in addition to providing mechanical force for dislodging contaminants and soil from the article being cleaned and from one another.
- the individual functions of the detergent, ion exchange agent, and adsorbent, taken one at a time, are the functions associated with those names by chemists although the action by which the function is provided may not yet have been defined.
- the detergent through the applicaa 3,047,434 C3 Patented July e1, 1962 2 tion of hydrophilic, hydrophobic, lipophilic, or lipophobic forces or chelating action, overcomes the mechanical forces and affinities which bind the soil and contaminants to the articlebeing cleaned.
- the ion exchange agent having polarity opposed to the polarity of the charge associated with the instability or radioactivity of the contaminant, has an afinity for the contaminant and joins it to form a discreet particle.
- the integrity of the union of the exchange agent and contaminant is preserved by their adherence in combination to the adherent which in turn is prevented by the detergent from adherence to the article being cleaned.
- the ion exchange agent is selected in accordance with principles well known in the chemical art so that chemists having at least ordinary skill can select a proper agent.
- sulfides, carbonates, hydroxides and sulfates can be utilized.
- the sodium salts of these radicals are preferred in accordance with the invention and a positive ion from this group should be included if there exists a possibility that one of the contaminants is negative.
- the detergent advantageously includes a chelating agent.
- the detergent consist primarily of water.
- the detergent may comprise a mixture of water and ethylene diam-inc tetra acetic acid.
- silicates such as a colloidal cl-ay, talc, and fullers earth, chalk; sulfides of arsenic and antimony; diatomaceous earth; carbon black; and metallic oxides such as alumina, magnesia, iron oxide, and titanium and manganese dioxide.
- solutions made according to the invention may be augmented and hastened by mechanical agitation to insure that fresh solution reaches the surface to be decontaminated and by mechanical actions on the soil itself.
- a superior kind of such mechanical action is ultrasonic cavitation of the decontamination solution and the solution found to be most advantageous for general decontamination is entirely compatible with this kind of action.
- That solution comprises water, ethylene diamine tetra acetic acid, sodium sulfate, sodium hydroxide, manganese dioxide, and carbon black.
- a solution for radioactive decontamination comprising a mixture of water, ethylene diamine tetra acetic acid, sodium sulfate, sodium hydroxide, manganese dioxide, and carbon black.
- the decontamination method which comprises immersing a radioactively contaminated article in a solution comprised of water, ethylene diamine tetra acetic acid, sodium sulfate, sodium hydroxide, manganese dioxide,
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Detergent Compositions (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
This invention relates to solutions and methods for radioactive decontamination.
Radioactive contaminants occur as unstable forms of the elements which in practical situations may be found in pure form but are usually found mixed in any of a wide variety of soils. Effective decontamination involves both stabilization and physical removal of the radioactive contaminant. An object of the invention is to provide improved solutions and methods for achieving this result.
Previous decontamination methods have been based on an attempt to remove the soil from articles to be cleaned in the hope that its radioactive ingredients would be removed in the process. The process is practiced in the specific form required for the removal of the soil. On the other hand, this invention provides a decontamination solution capable of direct action on the radioactive contaminant although in practice it will remove most of the soils as well.
Another object is to provide highly effective solutions for decontamination when the radioactive contaminant is specifically identified; but the provision of solutions which are very effective evenvwhen the radioactive contaminant is not known, is also an object.
Another object of the invention is to provide a solution, for general application to the problem of decontamination, sufiiciently effective to warrant its use for average cases, for those cases in which a variety of radioactive substances are present, and for first decontamination in preparation for specific contamination in special cases.
Another important object is to provide a solution which is sufliciently inexpensive to make practical the decontamination of inexpensive hand tools such as pliers, screwdrivers, and the like which now must be disposed of, often after only a single usage.
These andother objects and advantages of the invention which will hereinafter be apparent, are realized by the provision of a radioactive contaminant comprising a mixture of a detergent liquid, an ion exchange agent soluble in said liquid to form ions charged oppositely of the radioactive contaminant, and adsorbent solids distributed in the liquid. Each of these ingredients has a specific individual function in the decontamination process, the effectiveness of each of which depends upon the function of the other whereby the invention contemplates solutions simultaneously containing all of these substances. The article to be decontaminated is immersed in the solution which advantageously is subjected to forces producing cavitation. 1
In addition to their functional interdependence there is a mechanical cooperation between the substances. The detergent serves as the vehicle by which the exchange agent and adsorbent may move into association with one another and the surface to be cleaned, while the forces exerted by the substances accounts for that movement. Provision for cavitation action aids the movement and intermixing of the constituents of the solvent in addition to providing mechanical force for dislodging contaminants and soil from the article being cleaned and from one another.
The individual functions of the detergent, ion exchange agent, and adsorbent, taken one at a time, are the functions associated with those names by chemists although the action by which the function is provided may not yet have been defined. The detergent, through the applicaa 3,047,434 C3 Patented July e1, 1962 2 tion of hydrophilic, hydrophobic, lipophilic, or lipophobic forces or chelating action, overcomes the mechanical forces and affinities which bind the soil and contaminants to the articlebeing cleaned.
The ion exchange agent, having polarity opposed to the polarity of the charge associated with the instability or radioactivity of the contaminant, has an afinity for the contaminant and joins it to form a discreet particle. The integrity of the union of the exchange agent and contaminant is preserved by their adherence in combination to the adherent which in turn is prevented by the detergent from adherence to the article being cleaned.
When the contaminant is identified, the ion exchange agent is selected in accordance with principles well known in the chemical art so that chemists having at least ordinary skill can select a proper agent. When the contaminants or some of them are not identified, sulfides, carbonates, hydroxides and sulfates can be utilized. The sodium salts of these radicals are preferred in accordance with the invention and a positive ion from this group should be included if there exists a possibility that one of the contaminants is negative.
To augment the action of the exchange agent, the detergent advantageously includes a chelating agent. In the interest of cost reduction as well as for its eflectiveness as a wetting agent in connection with most soils, it is preferred that the detergent consist primarily of water. Advantageously the detergent may comprise a mixture of water and ethylene diam-inc tetra acetic acid.
A wide variety of adsorbents have been used with good results including silicates such as a colloidal cl-ay, talc, and fullers earth, chalk; sulfides of arsenic and antimony; diatomaceous earth; carbon black; and metallic oxides such as alumina, magnesia, iron oxide, and titanium and manganese dioxide.
Of course, the action of solutions made according to the invention may be augmented and hastened by mechanical agitation to insure that fresh solution reaches the surface to be decontaminated and by mechanical actions on the soil itself.
A superior kind of such mechanical action is ultrasonic cavitation of the decontamination solution and the solution found to be most advantageous for general decontamination is entirely compatible with this kind of action. That solution comprises water, ethylene diamine tetra acetic acid, sodium sulfate, sodium hydroxide, manganese dioxide, and carbon black.
By way of example and not of limitation, since other solutions are possible and the relative quantities in this solution may be modified within the scope of the invention and the appended claims, a particularly effective solution for decontamination was made by the mixing of ingredients in the following proportions:
milliliters of water, 1 gram ethylene diamine tetra acetic acid, 0.2 gram sodium sulfate, 0.2 gram sodium hydroxide, 0.1 gram manganese dioxide and 0.1 gram carbon black. A soiled article having radioactive contaminants, especially radioactive cesium 134, was immersed in this solution.
Also, a similarly contaminated article was immersed in a like solution and the latter was activated to produce cavitation bythe action of ultrasonic energy with improved result.
I claim: I
1. A solution for radioactive decontamination comprising a mixture of water, ethylene diamine tetra acetic acid, sodium sulfate, sodium hydroxide, manganese dioxide, and carbon black.
2. The decontamination method which comprises immersing a radioactively contaminated article in a solution comprised of water, ethylene diamine tetra acetic acid, sodium sulfate, sodium hydroxide, manganese dioxide,
3 4 and carbon black, and subjecting said solution to ultra- 2,401,484 Jackson June 4, 1946 sonic vibration forces sufiicient to produce cavitation 2,607,738 Hardy Aug. 19, 1952 therein. 2,672,449 Snell Mar. 16, 1954 2,678,303 Bonewitz May 11, 1954 References Cried 1n the file of th1s patent 5 2,736,640 McGraW Feb- 28 1956 UNITED STATES PATENTS 2,739,882 Ellis Mar. 27, 1956 2,016,265 Doherty Oct. 1, 1935 2,802,758 Kearney Aug. 13, 1957 2,241,984 Cooper May 13, 1941 2,814,575 Lange NOV. 26, 1957
Claims (2)
1. A SOLUTION FOR RADIOACTIVE DECONTAMINATION COMPRISING A MIXTURE OF WATER, ETHYLENE DIAMINE TETRA ACETIC ACID, SODIUM SULFATE, SODIUM HYDROXIDE, MANFANESE DIOXIDE, AND CARBON BLACK.
2. THE DECONTAMINATION METHOD WHICH COMPRISES IMMERSING A RADIOACTIVELY CONTAMINATED ARTICLE IN A SOLUTION COMPRISES OF WATER ETHYLENE DIAMINE TETRA ACETIC ACID, SODIUM SULFATE, SODIUM HYDROXIDE MANGNASES DIOXIDE, AND CARBON BLACK AND SUBJECTING SAID SOLUTION TO ULTRASONIC VIBRATION FORCES SUFFICIENT TO PRODUCE CAVIATION THEREIN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US724501A US3047434A (en) | 1958-03-28 | 1958-03-28 | Solutions and methods for radioactive decontamination |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US724501A US3047434A (en) | 1958-03-28 | 1958-03-28 | Solutions and methods for radioactive decontamination |
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US3047434A true US3047434A (en) | 1962-07-31 |
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US724501A Expired - Lifetime US3047434A (en) | 1958-03-28 | 1958-03-28 | Solutions and methods for radioactive decontamination |
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Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3437521A (en) * | 1964-01-21 | 1969-04-08 | Purex Corp Ltd | Radioactive decontamination |
US3488219A (en) * | 1965-01-23 | 1970-01-06 | Collo Rhelncollodium Koln Gmbh | Method and means for removal of radioactive contaminants |
US4056112A (en) * | 1974-05-02 | 1977-11-01 | Calvin Calmon | Containment and removal of radioactive spills by depositing a crosslinked ion exchange composition in a dry form over region of spill |
US4659512A (en) * | 1983-12-21 | 1987-04-21 | Pedro B. Macedo | Fixation of dissolved metal species with a complexing agent |
US4681705A (en) * | 1985-10-15 | 1987-07-21 | Carolina Power & Light Company | Decontamination of radioactively contaminated liquids |
US4850380A (en) * | 1985-05-21 | 1989-07-25 | Pall Corporation | Entry/exit decontamination system using adsorbent powder |
US5292456A (en) * | 1992-03-20 | 1994-03-08 | Associated Universities, Inc. | Waste site reclamation with recovery of radionuclides and metals |
US5322644A (en) * | 1992-01-03 | 1994-06-21 | Bradtec-Us, Inc. | Process for decontamination of radioactive materials |
US5332532A (en) * | 1992-12-09 | 1994-07-26 | Waste Reduction By Waste Reduction, Inc. | Method for disposing of radioactively labeled animal carcasses |
US5434331A (en) * | 1992-11-17 | 1995-07-18 | The Catholic University Of America | Removal of radioactive or heavy metal contaminants by means of non-persistent complexing agents |
US6446277B1 (en) * | 1999-06-09 | 2002-09-10 | Prevor International | High-capacity method and system of chemical and/or radiological decontamination |
WO2006088826A2 (en) * | 2005-02-14 | 2006-08-24 | Total Separation Solutions, Llc | Conserving components of fluids |
US20060222574A1 (en) * | 2005-04-02 | 2006-10-05 | Kaye Gordon I | Apparatus and method for chemically reducing waste materials |
US20060247485A1 (en) * | 1996-04-22 | 2006-11-02 | Wilson Joseph H | System and method for treating infectious waste matter |
US20070038013A1 (en) * | 2001-01-24 | 2007-02-15 | Wilson Joseph H | System and method for treating infectious waste matter |
US20070185365A1 (en) * | 2006-02-07 | 2007-08-09 | Wright Karen E | Surface decontamination compositions and methods |
US20070197852A1 (en) * | 2006-02-10 | 2007-08-23 | Wilson Joseph H | Method and apparatus for treatment and disposal of waste material |
US20070193738A1 (en) * | 2005-02-14 | 2007-08-23 | Smith Kevin W | Treatment of cesium-containing fluids |
US20100069697A1 (en) * | 2006-05-01 | 2010-03-18 | Elmore Stephen C | Radioactive Material Sequestration |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2016265A (en) * | 1932-04-09 | 1935-10-01 | Standard Oil Dev Co | Cleaning composition |
US2241984A (en) * | 1941-05-13 | Glass washing composition | ||
US2401484A (en) * | 1940-08-03 | 1946-06-04 | Mine Safety Appliances Co | Composition for purification of air and a process of making same |
US2607738A (en) * | 1948-06-25 | 1952-08-19 | Monsanto Chemicals | Bleaching, sterilizing, disinfecting, and deterging compositions |
US2672449A (en) * | 1949-09-15 | 1954-03-16 | Foster D Snell Inc | Composition for cleaning metal |
US2678303A (en) * | 1950-09-07 | 1954-05-11 | Paul W Bonewitz | Water treating and cleaning composition |
US2736640A (en) * | 1954-12-01 | 1956-02-28 | Fmc Corp | Chemical polishing bath |
US2739882A (en) * | 1954-02-25 | 1956-03-27 | Raytheon Mfg Co | Surface treatment of germanium |
US2802758A (en) * | 1954-06-10 | 1957-08-13 | Detrex Corp | Method of cleaning |
US2814575A (en) * | 1954-08-13 | 1957-11-26 | Hodes Lange Corp | Method and apparatus for cleaning ampoules with the aid of ultrasonic vibration |
-
1958
- 1958-03-28 US US724501A patent/US3047434A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2241984A (en) * | 1941-05-13 | Glass washing composition | ||
US2016265A (en) * | 1932-04-09 | 1935-10-01 | Standard Oil Dev Co | Cleaning composition |
US2401484A (en) * | 1940-08-03 | 1946-06-04 | Mine Safety Appliances Co | Composition for purification of air and a process of making same |
US2607738A (en) * | 1948-06-25 | 1952-08-19 | Monsanto Chemicals | Bleaching, sterilizing, disinfecting, and deterging compositions |
US2672449A (en) * | 1949-09-15 | 1954-03-16 | Foster D Snell Inc | Composition for cleaning metal |
US2678303A (en) * | 1950-09-07 | 1954-05-11 | Paul W Bonewitz | Water treating and cleaning composition |
US2739882A (en) * | 1954-02-25 | 1956-03-27 | Raytheon Mfg Co | Surface treatment of germanium |
US2802758A (en) * | 1954-06-10 | 1957-08-13 | Detrex Corp | Method of cleaning |
US2814575A (en) * | 1954-08-13 | 1957-11-26 | Hodes Lange Corp | Method and apparatus for cleaning ampoules with the aid of ultrasonic vibration |
US2736640A (en) * | 1954-12-01 | 1956-02-28 | Fmc Corp | Chemical polishing bath |
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3437521A (en) * | 1964-01-21 | 1969-04-08 | Purex Corp Ltd | Radioactive decontamination |
US3488219A (en) * | 1965-01-23 | 1970-01-06 | Collo Rhelncollodium Koln Gmbh | Method and means for removal of radioactive contaminants |
US3487916A (en) * | 1965-01-23 | 1970-01-06 | Collo Rheincollodium Cologne G | Method and means for removal of radioactive contaminants |
US4056112A (en) * | 1974-05-02 | 1977-11-01 | Calvin Calmon | Containment and removal of radioactive spills by depositing a crosslinked ion exchange composition in a dry form over region of spill |
US4659512A (en) * | 1983-12-21 | 1987-04-21 | Pedro B. Macedo | Fixation of dissolved metal species with a complexing agent |
US4850380A (en) * | 1985-05-21 | 1989-07-25 | Pall Corporation | Entry/exit decontamination system using adsorbent powder |
US4681705A (en) * | 1985-10-15 | 1987-07-21 | Carolina Power & Light Company | Decontamination of radioactively contaminated liquids |
US5322644A (en) * | 1992-01-03 | 1994-06-21 | Bradtec-Us, Inc. | Process for decontamination of radioactive materials |
US5292456A (en) * | 1992-03-20 | 1994-03-08 | Associated Universities, Inc. | Waste site reclamation with recovery of radionuclides and metals |
US5434331A (en) * | 1992-11-17 | 1995-07-18 | The Catholic University Of America | Removal of radioactive or heavy metal contaminants by means of non-persistent complexing agents |
US5332532A (en) * | 1992-12-09 | 1994-07-26 | Waste Reduction By Waste Reduction, Inc. | Method for disposing of radioactively labeled animal carcasses |
US20060247485A1 (en) * | 1996-04-22 | 2006-11-02 | Wilson Joseph H | System and method for treating infectious waste matter |
US7910788B2 (en) | 1996-04-22 | 2011-03-22 | Digestor, Llc | System for treating infectious waste matter |
US20110040138A1 (en) * | 1996-04-22 | 2011-02-17 | Wilson Joseph H | System and method for treating infectious waste matter |
US6446277B1 (en) * | 1999-06-09 | 2002-09-10 | Prevor International | High-capacity method and system of chemical and/or radiological decontamination |
US20070038013A1 (en) * | 2001-01-24 | 2007-02-15 | Wilson Joseph H | System and method for treating infectious waste matter |
GB2437873A (en) * | 2005-02-14 | 2007-11-07 | Total Separation Solutions Llc | Conserving components of fluids |
US7568523B2 (en) | 2005-02-14 | 2009-08-04 | Total Separation Solutions, Llc | Treatment of cesium-containing fluids |
WO2006088826A3 (en) * | 2005-02-14 | 2007-01-25 | Total Separation Solutions Llc | Conserving components of fluids |
US20070193738A1 (en) * | 2005-02-14 | 2007-08-23 | Smith Kevin W | Treatment of cesium-containing fluids |
WO2006088826A2 (en) * | 2005-02-14 | 2006-08-24 | Total Separation Solutions, Llc | Conserving components of fluids |
GB2453063A (en) * | 2005-02-14 | 2009-03-25 | Total Separation Solutions Llc | A method of upgrading a caesium containing solution |
GB2437873B (en) * | 2005-02-14 | 2009-04-08 | Total Separation Solutions Llc | Conserving components of fluids |
US20090277633A1 (en) * | 2005-02-14 | 2009-11-12 | Smith Kevin W | Treatment of Cesium-Containing Fluids |
GB2453063B (en) * | 2005-02-14 | 2009-08-12 | Total Separation Solutions Llc | Conserving components of fluids |
US20060222574A1 (en) * | 2005-04-02 | 2006-10-05 | Kaye Gordon I | Apparatus and method for chemically reducing waste materials |
US20070185365A1 (en) * | 2006-02-07 | 2007-08-09 | Wright Karen E | Surface decontamination compositions and methods |
US7915472B2 (en) | 2006-02-07 | 2011-03-29 | Battelle Energy Alliance, Llc | Surface decontamination compositions and methods |
US20070197852A1 (en) * | 2006-02-10 | 2007-08-23 | Wilson Joseph H | Method and apparatus for treatment and disposal of waste material |
US20100069697A1 (en) * | 2006-05-01 | 2010-03-18 | Elmore Stephen C | Radioactive Material Sequestration |
US7799143B2 (en) * | 2006-05-01 | 2010-09-21 | George Mason Intellectual Properties, Inc. | Method for removing radionuclides from a radioactive material |
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