Method for purifying 226Ra-containing solution, method for producing 226Ra target, and method for producing 225Ac

Patent metadata

Field	Value
Publication number	US-12179149-B2
Application number	US-202017622390-A
Country	US
Kind code	B2
Filing date	Jun 25, 2020
Priority date	Jul 2, 2019
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

An object of the present invention is to provide a method for purifying efficiently and easily a 226 Ra-containing solution obtained when 225 Ac is produced from a 226 Ra target, a method for producing a 226 Ra target by using the purified 226 Ra-containing solution obtained by the above purification method, and a method for producing 225 Ac including these above methods. The method for purifying a 226 Ra-containing solution according to the present invention is characterized by including an adsorption step (R1) of allowing 226 Ra ions to adsorb onto a carrier having a function of selectively adsorbing divalent cations by bringing a 226 Ra-containing solution (a) into contact with the carrier under an alkaline condition; and an elution step (R2) of eluting the 226 Ra ions from the carrier under an acidic condition.

First claim

The invention claimed is:

1. A method for purifying a 226 Ra-containing solution, comprising the steps:
(R1) of allowing a 226 Ra ion to adsorb onto a carrier having a function of selectively adsorbing a divalent cation by bringing a 226 Ra-containing solution (a) into contact with the carrier under an alkaline condition; and
(R2) of eluting the 226 Ra ion from the carrier under an acidic condition.

2. The method for purifying a 226 Ra-containing solution according to claim 1 , wherein
the carrier has a divalent cation-exchange group.

3. The method for purifying a 226 Ra-containing solution according to claim 1 , wherein
the carrier has an iminodiacetic acid group.

4. The method for purifying a 226 Ra-containing solution according to claim 1 , further comprising a step (R3) of performing anion exchange by passing a solution containing a 226 Ra ion eluted in the elution step (R2) through an anion exchange resin.

5. The method for purifying a 226 Ra-containing solution according to claim 1 , wherein
the 226 Ra-containing solution (a) is obtained by separating an 225 Ac component from a solution in which a 226 Ra target irradiated with at least one kind selected from a charged particle, a photon, and a neutron by using an accelerator has been dissolved.

6. The method for purifying a 226 Ra-containing solution according to claim 1 , wherein
the carrier is charged in a tube.

7. A method for producing a 226 Ra target, comprising the steps:
(R4) of preparing an electrodeposition liquid by using a purified 226 Ra-containing solution (b) obtained by the purification method according to claim 1 ; and
(R5) of electrodepositing a 226 Ra-containing substance on a substrate by using the electrodeposition liquid.

8. The method for producing a 226 Ra target according to claim 7 , further comprising
a purification method comprising the steps:
(R6) of allowing a 226 Ra ion to adsorb onto a carrier having a function of selectively adsorbing a divalent cation by bringing a 226 Ra-containing solution (c) after the electrodeposition step (R5) into contact with the carrier under an alkaline condition; and
(R7) of eluting the 226 Ra ion from the carrier under an acidic condition, wherein
a purified 226 Ra-containing solution (d) obtained by the purification method is mixed with the purified 226 Ra-containing solution (b), and an electrodeposition liquid is prepared in the electrodeposition liquid preparation step (R4).

9. The method for producing a 226 Ra target according to claim 8 , further comprising a step
(R8) of performing anion exchange by passing a solution containing a 226 Ra ion eluted in the elution step (R7) through an anion exchange resin.

Assignees

• Nihon Mediphysics Co Ltd

Inventors

• Honda Yoshio
• Yano Shinya

Classifications

• G21G2001/0094

  Other isotopes not provided for in the groups listed above · CPC title

• C25D3/54

  of metals not provided for in groups C25D3/04 - C25D3/50 · CPC title

• B01D2253/206

  Ion exchange resins · CPC title

• B01D15/424

  Elution mode · CPC title

• B01D15/363

  Anion-exchange · CPC title