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Review
, 4 (3), 177-85

Astatine-211: Production and Availability

Affiliations
Review

Astatine-211: Production and Availability

Michael R Zalutsky et al. Curr Radiopharm.

Abstract

The 7.2-h half life radiohalogen (211)At offers many potential advantages for targeted α-particle therapy; however, its use for this purpose is constrained by its limited availability. Astatine-211 can be produced in reasonable yield from natural bismuth targets via the (209)Bi(α,2n)(211)At nuclear reaction utilizing straightforward methods. There is some debate as to the best incident α-particle energy for maximizing 211At production while minimizing production of (210)At, which is problematic because of its 138.4-day half life α-particle emitting daughter, (210)Po. The intrinsic cost for producing (211)At is reasonably modest and comparable to that of commercially available (123)I. The major impediment to (211)At availability is attributed to the need for a medium energy α-particle beam for its production. On the other hand, there are about 30 cyclotrons in the world that have the beam characteristics required for (211)At production.

Figures

Fig. (1)
Fig. (1)
Simplified scheme illustrating double-branched decay of 211At.
Fig. (2)
Fig. (2)
Excitation functions for α-particle-induced reactions on natural bismuth targets; A) 209Bi(α,2n)211At reaction and B) 209Bi(α,3n)210At reaction. Cyclotron Produced Radionuclides: Physical Characteristics and Production Methods, Technical Reports Series Number 468, International Atomic Energy Agency: Vienna, 2009, pp. 33-40 with permission from the IAEA.

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