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Cyclotron production and radiochemical separation of 55Co and 58mCo from 54Fe 58Ni and 57Fe targets

机译:回旋加速器生产和从54Fe58Ni和57Fe靶中分离55Co和58mCo的放射化学

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摘要

This work presents the production with a cyclotron of the positron emitter 55Co via the 54Fe(d,n) and 58Ni(p,α) reactions and the Auger electron emitter 58mCo via the 57Fe(d,n) reaction after high current (40 μA p and 60 μA d) irradiation on electroplated targets. High specific activity radionuclides (up to 55.6 GBq/μmol 55Co and 31.8 GBq/μmol 58mCo) with high radionuclidic purity (99.995% 55Co from 54Fe, 98.8% 55Co from 58Ni, and 98.7% 58mCo from 57Fe at end of bombardment, EoB), in high activity concentration (final separated radionuclide in < 0.6 mL) and with almost quantitative overall activity separation yield (> 92%) were obtained after processing of the irradiated targets with novel radiochemical separation methods based on HCl dissolution and the resin N,N,N′,N′-tetrakis-2-ethylhexyldiglycolamide (DGA, branched). One hour long irradiations using 38–65, 110–214 and 59–78 mg of enriched 54Fe (99.93%), 58Ni (99.48%) and 57Fe (95.06%), respectively, electroplated over a 1.0 cm2 surface, yielded 582 ± 66 MBq 55Co, 372 ± 14 MBq 55Co and 810 ± 186 MBq 58mCo, respectively, decay corrected to EoB. The separation methods allow for the recovery of the costly enriched target materials, which were reconstituted into metallic targets after novel electroplating methods, with an overall recycling efficiency of 93 ± 4% for iron. The produced radionuclides were used to radiolabel the angiogenesis marker antibody TRC105 conjugated to the chelator NOTA as a demonstration of their quality.
机译:这项工作介绍了正电子发射器 55 Co的回旋加速器通过 54 Fe(d,n)和 58 Ni(p,在电镀靶上施加大电流(40μAp和60μAd)后,通过 57 Fe(d,n)反应进行α)反应和俄歇电子发射体 58m Co 。高比活度放射性核素(高达55.6 GBq /μmol 55 Co和31.8 GBq /μmol 55m Co)和高放射性核素纯度(99.995% 55 来自 54 Fe的Co,来自 58 Ni的98.8% 55 Co和来自的98.7% 58m Co轰击结束后,以高活性浓度(最终分离出的放射性核素含量<0.6 mL)中的57 Fe,最后分离出的总活性分离产率(> 92%)几乎是定量的(总分离活性> 92%) HCl溶解和树脂N,N,N',N'-四-2-乙基己基二甘醇酰胺(DGA,支链)的放射性化学分离方法。使用38–65、110–214和59–78 mg富集的 54 Fe(99.93%), 58 Ni(99.48%)和 57 Fe(95.06%)分别电镀在1.0 cm 2 表面上,产生58 2 ±66 MBq 55 Co分别为372±14 MBq 55 Co和810±186 MBq 58m Co衰减到EoB。分离方法可以回收成本高昂的靶材,这些靶材经过新颖的电镀方法后可以重新制成金属靶材,铁的总体回收效率为93±4%。产生的放射性核素用于放射性标记与螯合剂NOTA偶联的血管生成标记抗体TRC105,以证明其质量。

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