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

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

doi:10.2307/3574884

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

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

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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 language	English (US)
Pages (from-to)	231-239
Number of pages	9
Journal	Radiation Research
Volume	74
Issue number	2
DOIs	https://doi.org/10.2307/3574884
State	Published - 1978

ASJC Scopus subject areas

Biophysics
Radiation
Radiology Nuclear Medicine and imaging

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title = "α-Particle induced radical production in anthracene beyond the Bragg peak",

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.",

author = "Hu, {H. T.} and S. Arnold and M. Pope",

year = "1978",

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AU - Hu, H. T.

AU - Arnold, S.

AU - Pope, M.

PY - 1978

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N2 - 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.

AB - 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.

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JF - Radiation Research

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ER -

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

Abstract

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