Abstract
Photospallation cross sections of 232Th with bremsstrahlung beams of 0.25, 0.30 and 0.35 GeV maximum energies have been determined for 209At (66, 87 and 280 μb), 210At (74, 98 and 230 μb) and 121Rn (28, 40 and 130 μb). These yields are an order of magnitude lower than predicted by the Rudstam CDMD formula, possibly as a consequence of the rather thick Cu converter that was used. Irradiation of UO 2 at 0.3 GeV resulted in cross sections for 209At: 15.8 μb and for 210At: 17.9 μb. Cumulative photofission cross sections have been determined for A = 135 at 0.25 GeV (1.96 mb) and at 0.35 GeV (2.53 mb). Half-lives were measured for 207Po (6.7 h) and 211Rn (14.6 h).
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