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Updated: May 19, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Proton-induced cross sections relevant to production of 225Ac and 223Ra in natural thorium targets below 200 MeV
J W Weidner1, S G Mashnik, K D John
1Los Alamos National Laboratory, Los Alamos, NM 87545, USA. john.weidner@us.army.mil
Abstract:
Cross sections for (223,)(225)Ra, (225)Ac and (227)Th production by the proton bombardment of natural thorium targets were measured at proton energies below 200 MeV. Our measurements are in good agreement with previously published data and offer a complete excitation function for (223,)(225)Ra in the energy range above 90 MeV. Comparison of theoretical predictions with the experimental data shows reasonable-to-good agreement. Results indicate that accelerator-based production of (225)Ac and (223)Ra below 200 MeV is a viable production method.
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