203Tl ( p, 3n ) 201Pb
201Pb has a halflife of 9.33 h. Chemical separation is done to remove the Pb from the target Tl. The Pb decays to produce the desired 201Tl.
Also produced by the reaction 203Tl ( d , 4n ) 201Pb
Also produced by deuterons on Hg (Table of Isotopes, 7th Edition, Wiley & Sons, New York, Edited by: Liederer and Shirley, p 1292).