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The  nat Cr( p ,  xn )-process is a very efficient route for production of  52g Mn ( T  1/2  = 5.59 d). Based on measurements of distribution coefficients with different media and ion-exchange resins, an optimized chromatographic separation of radiomanganese from  nat Cr with the resin Amberlite CG400 was developed. With this system  nat Cr is eluted first with an acetic acid/methanol 1:1 mixture at room temperature and  52g Mn thereafter with 3 M HCl at 50 ℃. Within a separation time of 4 h the method yielded 99.5% of the n.c.a.  52g Mn in 2–3 mL of 3 M HCl. An ICP-MS analysis revealed a chromium impurity of 0.07 mg (0.014%) in the n.c.a.  52g Mn solution, making this separation method suitable for the production of  52g Mn for medical applications like positron emission tomography (PET).

Optimized separation procedure for production of no-carrier-added radiomanganese for positron emission tomography