METHOD FOR PURIFYING 226Ra-CONTAINING SOLUTION, METHOD FOR PRODUCING 226Ra TARGET, AND METHOD FOR PRODUCING 225Ac

Patent metadata

Field	Value
Publication number	US-2022367081-A1
Application number	US-202017622390-A
Country	US
Kind code	A1
Filing date	Jun 25, 2020
Priority date	Jul 2, 2019
Publication date	Nov 17, 2022
Grant date	—

Abstract

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

First claim

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.

10 - 11 . (canceled)

12 . A tube used for purifying a 226 Ra-containing solution, in which a carrier having a function of selectively adsorbing a divalent cation or an anion exchange resin is charged.

Assignees

• Nihon Mediphysics Co Ltd

Inventors

• Honda Yoshio
• Yano Shinya

Classifications

• G21G2001/0089

  Actinium · CPC title

• G21G2001/0094

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

• C25C1/22

  of metals not provided for in groups C25C1/02 - C25C1/20 · CPC title

• B01D2253/206

  Ion exchange resins · CPC title

• C01F15/00

  Compounds of thorium · CPC title