Nuclear photoactivation cross sections for short-lived isomeric states excited with a 6 MeV linac

J. A. Anderson, C. D. Eberhard, M. J. Byrd, J. J. Carroll, C. B. Collins, E. C. Scarbrough, P. P. Antich

Research output: Contribution to journalArticle

11 Scopus citations


Photoactivation cross sections for short-lived (T 1 2 < 20 s) isomeric states in 167Er, 79Br, 191Ir, 183W, 197Au, 77Se, 137Ba and 89Y were determined using bremsstrahlung from a 6 MeV medical therapy linac. A portable NaI(Tl) spectrometer and pneumatic transfer system was designed to avoid impacting normal use of the linac. Comparison with data obtained at the PITHON flash X-ray source (1.5 MeV endpoint energy) indicates that cross sections for populating these isomers through gateway states in the range 1.5-6 MeV are more than three orders of magnitude greater than corresponding cross sections below 1.5 MeV. The results are significant for the development of photoactivation techniques to measure short (<100 ns), nonreproducible bremsstrahlung pulses.

Original languageEnglish (US)
Pages (from-to)452-454
Number of pages3
JournalNuclear Inst. and Methods in Physics Research, B
Issue numberPART 1
StatePublished - Apr 2 1989


ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this