Abstract
This paper compares the performance of four different Tissue-Equivalent proportional counters (TEPC)
first in standard radiation fields, with gamma and neutron sources, then in the mixed and complex/
intense neutron and photon stray radiation field of a scanning proton therapy facility. The paper focuses
on the dead time correction and introduces a new spectra processing methodology to enable the
comparison of the four TEPCs while accounting for their different gas filling and gain, lineal energy range
of the spectrum and the analysis methodology. Measurements with 137Cs and/or 60Co gamma sources
demonstrate variable low-LET threshold for each TEPC while data acquired with a 252Cf neutron source
show comparable response of the four TEPCs for high-LET particles. Meanwhile, in the scattered field of
proton therapy, microdosimetric spectra measured at different positions and orientations around the
patient show a majority of high-LET events at the smallest angle with respect to the beam axis while low-
LET particles were mainly dominant at 90 from the beam axis. The introduced processing methodology
led to good overlapping of microdosimetric spectra for the four systems.
Details
Original language | English |
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Pages (from-to) | 42-52 |
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Number of pages | 10 |
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Journal | Radiation Measurements |
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Volume | 96 |
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DOIs | |
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Publication status | Published - 1 Jan 2017 |
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