Patent Number: 
Section: claims

1. A method of recovering highly enriched 99mTc as a raw material for a radioactive medicine, comprising the steps of:forming a high concentration Mo(99Mo) solution which contains radionuclides 99Mo and 99mTc which is generated as the daughter nuclide of 99Mo, in formation of a high concentration Mo solution which contains radionuclide 99Mo as a raw material for a radioactive medicine;obtaining 99mTc in said high-concentration Mo(99Mo) solution adsorbed to activated carbon selectively by feeding said formed high concentration Mo(99Mo) solution to an adsorption column which has said activated carbon, desorbing and removing Mo(99Mo) remaining in said activated carbon with a Mo desorbent, and recovering 99mTc by desorption treatment of 99mTc remaining in said activated carbon with a desorbent;making secondary purification to remove Mo(99Mo) remaining in said recovered 99mTc by an alumina column-method; andre-forming a high concentration Mo(99Mo) solution which contains radionuclides 99Mo and 99mTc by recirculating and recovering said high concentration Mo(99Mo) solution after said desorbing and removing of Mo(99Mo), and generating 99mTc again in the re-formed high concentration Mo(99Mo) solution to a radiation-equilibrium state. 2. The method of recovering highly enriched 99mTc according to claim 1, further comprising the steps of:forming said high concentration Mo solution which contains 99Mo by directly dissolving Mo compound irradiated with neutron in a nuclear reactor with an alkaline solution; supplying said high concentration Mo solution to a plurality of Mo containers; enriching 99mTc with adsorption of the 99mTc by feeding said high concentration Mo solution stored in said plurality of Mo containers to said adsorption column containing said activated carbon; and then eluting and purifying 99mTc. 3. The method of recovering highly enriched 99mTc according to claim 1, whereinthe recovery of 99mTc by said desorption treatment is performed by removing the residual Mo(99Mo) adhered to said activated carbon by washing said activated carbon for adsorbing 99mTc with a relatively dilute alkaline solution, and further performing said desorption treatment of said activated carbon adsorbing 99mTc with a relatively high concentration alkaline solution relative to the alkaline concentration of the dilute alkaline solution. 4. The method of recovering highly enriched 99mTc according to claim 3, wherein99mTc is eluted and purified by treating said activated carbon with a NaOH solution of 0.05 mole (M) and more at 100° C. and more and at 5 atm and more. 5. The method of recovering highly enriched 99mTc according to claim 1, whereinthe recovery of 99mTc by said desorption treatment is performed by an electrochemical treatment of said activated carbon adsorbing 99mTc by using said activated carbon as a cathode. 6. A method for recovering highly enriched 99mTc as a raw material for a radioactive-medicine, comprising the steps of:forming a high concentration Mo solution which contains radioactive 99mTc as a raw material for a radioactive medicine;forming said high-concentration Mo solution which contains said radionuclides 99Mo and 99mTc which is generated as the daughter nuclide of 99Mo;feeding said formed high-concentration Mo(99Mo) solution to an adsorption column which has activated carbon, obtaining 99mTc in said high-concentration Mo(99Mo) solution adsorbed to said activated carbon selectively, and desorbing and removing Mo(99Mo) by washing Mo(99Mo) remaining in said activated carbon adsorbing 99mTc with a Mo desorbent;adsorbing, desorbing, and recovering 99mTc by desorption treatment of 99mTc remaining in the activated carbon with a 99mTc desorbent, after the desorbing and removing of Mo(99Mo) by washing Mo(99Mo) remaining in said activated carbon adsorbing 99mTc with a Mo desorbent;removing Mo(99Mo) remaining in said recovered 99mTc by an alumina column-method: andrecirculating and recovering said high concentration Mo(99Mo) solution, generating 99mTc again in the recirculated and recovered high concentration Mo(99Mo) solution to a radiation-equilibrium state, and re-forming a high concentration Mo solution containing radionuclides 99Mo and 99mTc to reuse said high concentration Mo(99Mo) solution after said desorbing and removing of Mo(99Mo). 7. A method for recovering highly enriched 99mTc as a raw material for a radioactive-medicine, comprising the steps of:forming a high concentration Mo solution which contains radionuclide 99Mo as a raw material for a radioactive-medicine by directly dissolving a large amount of Mo with an alkaline solution;forming said high concentration Mo solution which contains radionuclides 99Mo and 99mTc which is generated to a radiation-equilibrium state so as to be the daughter nuclide of 99Mo;obtaining 99mTc in said high-concentration Mo(99Mo) solution adsorbed to activated carbon selectively by feeding said formed high concentration Mo(99Mo) solution to an adsorption column which has said activated carbon, and desorbing Mo(99Mo) by washing Mo(99Mo) remaining in said activated carbon with a Mo desorbent;desorbing and recovering 99mTc to recover 99mTc by desorption treatment of 99mTc with a 99mTc desorbent from said activated carbon adsorbing 99mTc;removing Mo(99Mo) remaining in said recovered 99mTc by an alumina column-method; andcirculating and recovering said high-concentration Mo(99Mo) solution, generating 99mTc again in the circulated and recovered high-concentration Mo(99Mo) solution to a radiation-equilibrium condition, and re-forming a high concentration Mo solution containing radionuclides 99Mo and 99mTc to reuse said high concentration Mo(99Mo) solution after said desorbing of Mo(99Mo). 8. A method of recovering 99mTc enriched to the required concentration as radioactive medicines and raw materials for its labeled compound, comprising the steps of:forming a high concentration Na2Mo(99Mo)O4 solution of neutral pH in which a large amount of Mo(99Mo)O3 is dissolved with NaOH,obtaining 99mTc generated in the high concentration Na2Mo(99Mo)O4 solution adsorbed to activated carbon selectively,maintaining 99mTc adsorbed to the activated carbon while desorbing the Mo(99Mo) from the activated carbon, and recovering at least a trace of the 99mTc by desorption treatment of 99mTc remaining in the activated carbon with a 99mTc desorbent, andremoving Mo(99Mo) remaining in said recovered 99mTc by an alumina column-method.