α-Particle induced radical production in anthracene beyond the Bragg peak

H. T. Hu, S. Arnold, M. Pope

Research output: Contribution to journalArticle

Abstract

Triplet excitons are used as a sensitive probe for the spatial distribution of paramagnetic defects (exciton sounding). Following α-particle (12-30 MeV) bombardment of an anthracene crystal, a remarkably long tail (supertail) of paramagnetic defects (free radicals) was found, extending into the crystal for a distance of about six times that of the Bragg peak. Evidence is presented that of all possible mechanisms for this supertail, only recoil protons can account quantitatively for the observed spatial distribution. A model calculation indicates that the proton-induced radical yield is about five times that for α particles. The limitations of this model are discussed.

Original languageEnglish (US)
Pages (from-to)231-239
Number of pages9
JournalRadiation Research
Volume74
Issue number2
DOIs
StatePublished - 1978

ASJC Scopus subject areas

  • Biophysics
  • Radiation
  • Radiology Nuclear Medicine and imaging

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