Production of Th229 for medical applications: Excitation functions of low-energy protons on Th232 targets

Griswold, Justin R.; Jost, Carola U.; Stracener, Daniel W.; Bruffey, Stephanie H.; Denton, David L.; Garland, Marc A.; Heilbronn, Lawrence; Mirzadeh, Saed

doi:10.1103/PhysRevC.98.044607

Title: Production of ${}^{229}{Th}$ for medical applications: Excitation functions of low-energy protons on ${}^{232}{Th}$ targets

Journal Article · Fri Oct 12 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.98.044607· OSTI ID:1479792

^[1]; Jost, Carola U. ^[1];

^[2];

^[2]; Denton, David L. ^[2]; Garland, Marc A. ^[3]; Heilbronn, Lawrence ^[4];

^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); USDOE, Office of Nuclear Physics, Washington, D.C. (United States)
Univ. of Tennessee, Knoxville, TN (United States)

As a part of a general program to evaluate production routes for ²²⁹Th, we studied production of ²²⁹Th via proton-induced reactions on ²³²Th targets bombarded with low-energy protons, E_p ≤ 40MeV. The reported excitation functions include those for proton-induced reactions on natural thorium yielding to ^{228,229,230&232}Pa isotopes; ²³²Th(p,xn) reactions, where x=1, 3, 4, and 5, at proton energy ranges of 12–40 MeV. Although the data for ²³²Th(p,n)²²⁸Pa, ²³²Th(p,3n)²³⁰Pa, and ²³²Th(p,5n)²³²Pa reactions were deduced by direct analysis of the thorium foils after irradiation, the data for ²³²Th(p,4n)²²⁹Pa were obtained by radiochemical techniques. The half-life of ²²⁹Pa was evaluated and determined to be 1.55 ± 0.01 d. Further, the α-branching ratio, α/(α + EC) of ²²⁹Pa was evaluated to be 0.53 ± 0.10% by allowing ²²⁹Pa to decay for ~7d, then chemically extracting and quantifying the ²²⁵Ac (t_1/2 = 10.0±0.1d) from ²²⁹Pa samples. In addition, we report the effective production cross section of ²²⁹Th in a thick ²³²Th target in the proton energy range of 23–33 MeV. The peak of the excitation function for the ²³²Th(p,4n)²²⁹Pa reaction occurs at 162 ± 14 mb and E_p=29.7±0.5MeV. This is only slightly larger than the effective cross section for the ²³²Th(p,x)²²⁹Th reaction (obtained from a thick target experiment). This data indicates that the ²³²Th(p,4n)²²⁹Pa reaction is the major reaction pathway for the cumulative ²³²Th(p,x)²²⁹Th reaction cross section in this energy range. The measured cross sections were compared with theoretical cross sections using the simulation codes Particle and Heavy Ion Transport code System (PHITS) and Monte Carlo Neutral Particle 6 (MCNP6). Furthermore, at proton energy ranges of 12–33 MeV, the cumulative excitation function predicted by PHITS for the reactions leading to ²²⁹Th was in close agreement with the experimental function, whereas the function predicted by MCNP6 was a factor of two higher at the peak of the excitation function.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1479792

Alternate ID(s):: OSTI ID: 1477541

Journal Information:: Physical Review C, Vol. 98, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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