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Home , Cadmium hydroxide

US008043584B2

(12) Ulllted States Patent (10) Patent N0.: US 8,043,584 B2

Lin et al. 45 Date of Patent: Oct. 25 a 2011

(54) METHOD OF RECYCLING CD-112 ISOTOPE (58) Field of Classi?cation Search ...... 423/11, 423/1014104, 491, 566.1, 594.18, 2; 205/281, (75) Inventors: Wuu-Jyh Lin, Taoyuan County (TW); 205/282, 369 s0ng_Un Tang, Taoyuan County (TW) See application ?le for complete search history.

(73) Assignee: Atomic Energy Council - Institute of (56) References Cited “r Energy Research’ Taoyuan FOREIGN PATENT DOCUMENTS

JP 2009-007633 * 1/2009 ( * ) Notice: Subject to any disclaimer, the term of this * cited by examiner patent is extended or adjusted under 35 U.S.C. 154(b) by 338 days. Primary Examiner * Steven B05 (74) Attorney, Agent, or Firm * Jackson IPG PLLC; (21) Appl. N0.: 11/812,984 Demian K, Jackson (22) Filed: Jun. 22, 2007 (57) ABSTRACT (65) Prior Publication D ata Cd-l 12 isotope is recycled from a Cd-l 12 chemical separated solution or a remainder of an electroplating solution having a Us 2011/0108429 A1 May 12, 2011 Cd-l 12 target. The present invention recycles Cd-112 isotope With a loW cost, a high purity and a high recycle rate. The (51) Int- Cl- recycled Cd-112 isotope can be easily stored. And, the C22B 17/00 (2006-01) Cd-112 isotope can be used as an imaging agent in nuclear (52) US. Cl...... 423/2; 423/11; 423/101; 423/102; medicine_ 423/103; 423/104; 423/491; 423/566.1; 423/594.18; 205/281; 205/282; 205/369 9 Claims, 2 Drawing Sheets

Obtammg a CdS ______/1 1 prec|p|tat|on

Formlng a CdCl2 12 so|ut|onI h-\_'__/

Obtammg a Cd(OH)2 -~___/13 preclpltatlon

Recycllng Cd-112 14 .isotope \J US. Patent Oct. 25, 2011 Sheet 1 012 US 8,043,584 B2

Obtaining a CdS precipitation i Forming a CdCl2 solution

Obtainingi a c<1(o|-i)2 \/13 precipitation i Recycling Cd-112 isotope US. Patent Oct. 25, 2011 Sheet 2 of2 US 8,043,584 B2

Obtaining a mixed solution \_/ 21

Obtainingi a Cd(OH)2 22 precipitation i Recycling (Dd-112 23 isotope -~\_/

FIG.2 US 8,043,584 B2 1 2 METHOD OF RECYCLING CD-112 ISOTOPE according to the present invention, taken in conjunction With the accompanying draWings, in Which FIELD OF THE INVENTION FIG. 1 and FIG. 2 are the vieWs shoWing the ?rst preferred embodiment and the second preferred embodiment according The present invention relates to recycling Cd-l l2 isotope; to the present invention. more particularly, relates to obtaining a (Cd(OH)2) precipitation by reacting a hydroxide With a DESCRIPTIONS OF THE PREFERRED chemical separated solution of a Cd-l 12 target or a remainder EMBODIMENTS of an electroplating solution having a Cd-l 12 target and thus recycling Cd-ll2 isotope through ?ltrating and rinsing the The folloWing descriptions of the preferred embodiments reacted solution having the Cd(OH)2 precipitation. are provided to understand the features and the structures of the present invention. DESCRIPTION OF THE RELATED ART Please refer to FIG. 1, Which is a vieW shoWing a ?rst preferred embodiment according to the present invention. As In-l l l isotope has a nuclear characteristic of trapping elec shoWn in the ?gures, the present invention is a method of tron and releasing tWo y-radiation characteristic energy spec recycling Cd-l l2 isotope, comprising the folloWing steps: trum. Because it has a short half life and a proper energy, the (al) Obtaining a CdS precipitation l l : A sul?de solution is In-l ll isotope is Widely used in a nuclear single photon added to a remainder of an electroplating solution having a emission computeriZed tomography (SPECT) to diagnose Cd-l 12 target to obtain a precipitation of cadmium sul?de human body diseases and aid in bio-researches. (CdS), Where the sul?de solution is a solution of sodium Some labeled compounds of In-l 11, like lllInCl3, lllIn 20 sul?de (Na2S). bleomysin and 1 1 lIn-DTPA octreotide, are used to diagnose a (bl) Forming a CdCl2 solution 12: is local tumor of an organ. Lipophilic complex compound added to the precipitation of CdS to form a solution of cad of lllIn-oxine can label leukocytes for imaging a gathering mium chloride (CdCl2). and diagnosing nidus of an in?ammation. Complex com (cl) Obtaining a Cd(OH)2 precipitation 13: A hydroxide pounds made of 111In together With monoclonal antibody, 25 solution is added to the CdCl2 solution to obtain a precipita platelet, globulin or recombinant tissue plasminogen activa tion of cadmium hydroxide (Cd(OH)2), Where the hydroxide tor (yt-PA) and Fab, (Fab')2 (immunoglobulin fragments) are solution is a solution of (Na(OH)) or a potential imaging agents neWly developed With excellent solution of (K(OH)). applications for scanning myocardial infarction and throm (dl) Recycling Cd-l l2 isotope 14: The Cd(OH)2 precipi bus and for doing bio-researches concerning thrombin and tation is moved into a semi-automatic vacuum ?ltration sys renal functions. 30 tem to be ?ltrated and rinsed for recycling Cd-l l2 isotope. In-l 11 is generally obtained from 112Cd(p,2n), 1 11Cd Please refer to FIG. 2, Which is a vieW shoWing a second (p,n), ”“’Cd(p,xn), 110Cd(d,n) or 109Ag(a,2n), Where the ?rst preferred embodiment. As shoWn in the ?gures, the present one has the best production by using a solid 112Cd target invention is a method of recycling Cd-l l2 isotope, compris having a high isotope enrichment With a proper target thick ing the folloWing steps: ness (~l 00 um) and a proper proton beam energy (~22 MeV). 35 (a2) Obtaining a mixed solution 21: A chemical separated For fabricating lllIn-DTPA octreotide for nuclear medi solution of a Cd-l 12 target and a cadmium bromide (CdBr2) cine through a cyclotron, Cd-l l2 isotope is required. HoW solution are mixed to obtain a mixed solution. ever, the Cd-l l2 isotope is not easy to be obtained and its cost (b2) Obtaining a Cd(OH)2 precipitation 13: A hydroxide is high. Hence, the prior art does not ful?ll all users’ requests solution is added to the mixed solution to obtain a precipita 40 tion of Cd(OH)2, Where the hydroxide solution is a solution of on actual use. Na(OH) or a solution of K(OH). SUMMARY OF THE INVENTION (c2) Recycling Cd-l l2 isotope 14: The Cd(OH)2 precipi tation is moved into a semi-automatic vacuum ?ltration sys tem to be ?ltrated and rinsed for recycling Cd-l l2 isotope. The main purpose of the present invention is to recycle The Cd-ll2 isotope recycled by the above tWo embodi Cd-l l2 isotope With a loW cost, a high recycle rate and a high ments can be calcined to obtain a solid (CdO); purity. or can be added With a solution of cyanide and an alkaline To achieve the above purpose, the present invention is a solution to obtain an electroplating solution having a Cd-l 12 method of recycling Cd-l l2 isotope, Where Cd-l l2 isotope is target, Where the Cd-l l2 isotope can be easily stored. The recycled through steps of: (al) adding a sul?de solution into recycle rate of Cd-l l2 isotope through using the present a remainder of an electroplating solution having a Cd-l 12 50 invention is more than 98% With a purity rate more than 99%. target to obtain a precipitation of cadmium sul?de (CdS); (bl) To sum up, the present invention is a method of recycling adding hydrochloric acid into the CdS precipitation to obtain Cd-l l2 isotope, Where Cd-l l2 isotope is recycled With a a solution of (CdCl2); (cl) adding a solu recycle rate more than 98% and a purity rate more than 99%; tion of hydroxide into the CdCl2 solution to obtain a Cd(OH)2 and, thus, a cost for purchasing Cd-l 12 is reduced and further precipitation; and (d1) ?ltrating and rinsing the Cd(OH)2 55 a cost for a nuclear medicine is loWered as Well. precipitation; or, through steps of: (a2) mixing a chemical The preferred embodiments herein disclosed are not separated solution of a Cd-l 12 target and a cadmium bromide intended to unnecessarily limit the scope of the invention. (CdBr2) solution to obtain a mixed solution; (b2) adding a Therefore, simple modi?cations or variations belonging to solution of a hydroxide into the mixed solution to obtain a the equivalent of the scope of the claims and the instructions Cd(OH)2 precipitation; and (c2) ?ltrating and rinsing the 60 disclosed herein for a patent are all Within the scope of the present invention. Cd(OH)2 precipitation. Accordingly, a novel method of recy cling Cd-l l2 isotope is obtained. What is claimed is: 1. A method of recycling a Cd-l l2 isotope, comprising BRIEF DESCRIPTIONS OF THE DRAWINGS steps of: adding a sul?de solution to an electroplating solution hav The present invention Will be better understood from the ing said Cd-l l2 isotope as a target to obtain a precipitate folloWing detailed descriptions of the preferred embodiments of cadmium sul?de; US 8,043,584 B2 3 4 adding hydrochloric acid to said precipitate of CdS to 6. A method of recycling a Cd-l l2 isotope, comprising obtain a solution of cadmium chloride; steps of: adding a solution of hydroxide to said solution of CdCl2 to mixing a solution of said Cd-l l2 isotope as a target and a obtain a precipitate of cadmium hydroxide; and cadmium bromide solution to obtain a mixed solution; ?ltering and rinsing saidprecipitate of Cd(OH)2 to separate 5 adding a solution of a hydroxide to said mixed solution to out said Cd-l l2 isotope. obtain a precipitate of Cd(OH)2; and 2. The method according to claim 1, ?ltering and rinsing saidprecipitate of Cd(OH)2 to separate Wherein said sul?de solution is a solution of sodium sul out said Cd-l l2 isotope. ?de. 7. The method according to claim 6, 3. The method according to claim 1, Wherein said solution of hydroxide is selected from the Wherein said solution of hydroxide is selected from the group consisting of a solution of NaOH and a solution of group consisting of a solution of sodium hydroxide and KOH. a solution of potassium hydroxide. 8. The method according to claim 6, 4. The method according to claim 1, Wherein said Cd-l 12 is calcined to obtain solid CdO. Wherein said Cd-l 12 is calcined to obtain solid cadmium 9. The method according to claim 6, oxide. Wherein said Cd-l l2 isotope is added to a solution of 5. The method according to claim 1, cyanide and an alkaline solution to obtain an electroplat Wherein said Cd-l 12 is added to a solution of cyanide and ing solution having said Cd-l l2 isotope. an alkaline solution to obtain an electroplating solution having said Cd-l l2 isotope. * * * * *