Production of 211At by a vertical beam irradiation method

We produced 211At by irradiating the semi-sealed encapsulated Bi target with an external vertical beam. At 28.5 MeV, the yield of 211At was 22 MBq/μA h (600 μCi/μA h). 211At was recovered by dry distillation, and 80% of the produced 211At was successfully obtained in dry Na211At form within 2 h from the end of bombardment (EOB). The radionuclidic purity of 211At was >99% at 5 h from EOB.