Comparisons of LET distributions for protons with energies between 50 and 200 MeV determined using a spherical Tissue-Equivalent Proportional Counter (TEPC) and a position-sensitive silicon spectrometer (RRMD-III)

T. B. Borak, T. Doke, T. Fuse, S. Guetersloh, L. Heilbronn, K. Hara, M. Moyers, S. Suzuki, P. Taddei, K. Terasawa, C. J. Zeitlin

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Experiments have been performed to measure the response of a spherical tissue-equivalent proportional counter (TEPC) and a silicon-based LET spectrometer (RRMD-III) to protons with energies ranging from 50-200 MeV. This represents a large portion of the energy distribution for trapped protons encountered by astronauts in low-Earth orbit. The beam energies were obtained using plastic polycarbonate degraders with a monoenergetic beam that was extracted from a proton synchrotron. The LET spectrometer provided excellent agreement with the expected LET distribution emerging from the energy degraders. The TEPC cannot measure the LET distribution directly. However, the frequency mean value of lineal energy, ȳf, provided a good approximation to LET. This is in contrast to previous results for high-energy heavy ions where ȳf underestimated LET, whereas the dose-averaged lineal energy, ȳD, provided a good approximation to LET.

Original languageEnglish
Pages (from-to)687-692
Number of pages6
JournalRadiation Research
Volume162
Issue number6
DOIs
Publication statusPublished - 2004 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Radiation
  • Radiology Nuclear Medicine and imaging

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