The biophysical properties of 3.9 GeV nitrogen ions. II. Microdosimetry

R. C. Rodgers, John F Dicello, W. Gross

Research output: Contribution to journalArticle

Abstract

The distributions in lineal energy of the events produced by 3.9 GeV nitrogen ions incident on a phantom have been measured at several depths with both walled and wall less proportional counters. Upstream from the Bragg peak, the distributions are narrow, reflecting the almost monoenergetic character of the radiation, while beyond the peak the distributions are broad. The dose mean lineal energy increases from about 20 keV/μm on entrance to almost 200 keV/μm at the peak, with most of the increase occurring in the last few millimeters before the peak. The distributions in LET calculated from the data are compared to corresponding distributions for 14.6 MeV neutrons and 90 MeV π- mesons and show that at the Bragg peak a much higher proportion of the nitrogen ion dose is delivered at LET values above 100 keV/μm than by either of the other radiations. The wall effect is found to increase the measured dose mean lineal energy by about 25% in the upstream region but it drops to about 10% at 3 mm from the Bragg peak.

Original languageEnglish (US)
Pages (from-to)12-23
Number of pages12
JournalRadiation Research
Volume54
Issue number1
StatePublished - 1973
Externally publishedYes

Fingerprint

Linear Energy Transfer
nitrogen ions
Nitrogen
Mesons
Ions
Radiation
ions
energy
Neutrons
nitrogen
dosage
upstream
proportional counters
radiation
entrances
proportion
mesons
neutrons

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Radiation

Cite this

The biophysical properties of 3.9 GeV nitrogen ions. II. Microdosimetry. / Rodgers, R. C.; Dicello, John F; Gross, W.

In: Radiation Research, Vol. 54, No. 1, 1973, p. 12-23.

Research output: Contribution to journalArticle

@article{8753a82d8fe340e7baca2d0b9b0fe899,
title = "The biophysical properties of 3.9 GeV nitrogen ions. II. Microdosimetry",
abstract = "The distributions in lineal energy of the events produced by 3.9 GeV nitrogen ions incident on a phantom have been measured at several depths with both walled and wall less proportional counters. Upstream from the Bragg peak, the distributions are narrow, reflecting the almost monoenergetic character of the radiation, while beyond the peak the distributions are broad. The dose mean lineal energy increases from about 20 keV/μm on entrance to almost 200 keV/μm at the peak, with most of the increase occurring in the last few millimeters before the peak. The distributions in LET calculated from the data are compared to corresponding distributions for 14.6 MeV neutrons and 90 MeV π- mesons and show that at the Bragg peak a much higher proportion of the nitrogen ion dose is delivered at LET values above 100 keV/μm than by either of the other radiations. The wall effect is found to increase the measured dose mean lineal energy by about 25{\%} in the upstream region but it drops to about 10{\%} at 3 mm from the Bragg peak.",
author = "Rodgers, {R. C.} and Dicello, {John F} and W. Gross",
year = "1973",
language = "English (US)",
volume = "54",
pages = "12--23",
journal = "Radiation Research",
issn = "0033-7587",
publisher = "Radiation Research Society",
number = "1",

}

TY - JOUR

T1 - The biophysical properties of 3.9 GeV nitrogen ions. II. Microdosimetry

AU - Rodgers, R. C.

AU - Dicello, John F

AU - Gross, W.

PY - 1973

Y1 - 1973

N2 - The distributions in lineal energy of the events produced by 3.9 GeV nitrogen ions incident on a phantom have been measured at several depths with both walled and wall less proportional counters. Upstream from the Bragg peak, the distributions are narrow, reflecting the almost monoenergetic character of the radiation, while beyond the peak the distributions are broad. The dose mean lineal energy increases from about 20 keV/μm on entrance to almost 200 keV/μm at the peak, with most of the increase occurring in the last few millimeters before the peak. The distributions in LET calculated from the data are compared to corresponding distributions for 14.6 MeV neutrons and 90 MeV π- mesons and show that at the Bragg peak a much higher proportion of the nitrogen ion dose is delivered at LET values above 100 keV/μm than by either of the other radiations. The wall effect is found to increase the measured dose mean lineal energy by about 25% in the upstream region but it drops to about 10% at 3 mm from the Bragg peak.

AB - The distributions in lineal energy of the events produced by 3.9 GeV nitrogen ions incident on a phantom have been measured at several depths with both walled and wall less proportional counters. Upstream from the Bragg peak, the distributions are narrow, reflecting the almost monoenergetic character of the radiation, while beyond the peak the distributions are broad. The dose mean lineal energy increases from about 20 keV/μm on entrance to almost 200 keV/μm at the peak, with most of the increase occurring in the last few millimeters before the peak. The distributions in LET calculated from the data are compared to corresponding distributions for 14.6 MeV neutrons and 90 MeV π- mesons and show that at the Bragg peak a much higher proportion of the nitrogen ion dose is delivered at LET values above 100 keV/μm than by either of the other radiations. The wall effect is found to increase the measured dose mean lineal energy by about 25% in the upstream region but it drops to about 10% at 3 mm from the Bragg peak.

UR - http://www.scopus.com/inward/record.url?scp=0015884124&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0015884124&partnerID=8YFLogxK

M3 - Article

C2 - 4699789

AN - SCOPUS:0015884124

VL - 54

SP - 12

EP - 23

JO - Radiation Research

JF - Radiation Research

SN - 0033-7587

IS - 1

ER -