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Beam quality correction factors for KAP meters for lightlyand heavily filtered X-ray beams

Herrnsdorf, L. LU and Petersson, H. LU (2016) In Radiation Protection Dosimetry 169(1). p.347-352
Abstract
Kerma-area product (KAP) meters have a pronounced energy dependence when measuring air KAP for lightly filtered X-ray beams (RQR). Today, it is also common with more heavily filtered beams. In this work, the energy dependence for lightly as well as heavily filtered beams (RQC) was investigated for several KAP meter models. The relative energy dependence of the readings of an external and an internal KAP meter was determined relative to an ionisation chamber, which had been calibrated at the primary standards laboratory. As a complement to the measurements, the sensitivity of a KAP meter for various X-ray beam qualities was modelled using Monte Carlo simulations of photon transport and absorption. The result showed a variation in relative... (More)
Kerma-area product (KAP) meters have a pronounced energy dependence when measuring air KAP for lightly filtered X-ray beams (RQR). Today, it is also common with more heavily filtered beams. In this work, the energy dependence for lightly as well as heavily filtered beams (RQC) was investigated for several KAP meter models. The relative energy dependence of the readings of an external and an internal KAP meter was determined relative to an ionisation chamber, which had been calibrated at the primary standards laboratory. As a complement to the measurements, the sensitivity of a KAP meter for various X-ray beam qualities was modelled using Monte Carlo simulations of photon transport and absorption. The result showed a variation in relative energy dependence of up to 30 %for KAP meters for RQC beam qualities compared with RQR qualities. A reduced sensitivity of KAP meters for heavily filtered beams in comparison with lightly filtered ones was found, and it is important that the beam-specific radiation quality correction factors are applied to correct the registered KAP values. (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
in
Radiation Protection Dosimetry
volume
169
issue
1
pages
6 pages
publisher
Oxford University Press
external identifiers
  • pmid:26994096
  • wos:000383492100055
  • scopus:84978929579
ISSN
0144-8420
DOI
10.1093/rpd/ncw042
language
English
LU publication?
yes
id
2d7eef2d-f359-465f-b11d-0ed60d288f98
date added to LUP
2016-09-08 16:50:41
date last changed
2025-01-12 11:06:55
@article{2d7eef2d-f359-465f-b11d-0ed60d288f98,
  abstract     = {{Kerma-area product (KAP) meters have a pronounced energy dependence when measuring air KAP for lightly filtered X-ray beams (RQR). Today, it is also common with more heavily filtered beams. In this work, the energy dependence for lightly as well as heavily filtered beams (RQC) was investigated for several KAP meter models. The relative energy dependence of the readings of an external and an internal KAP meter was determined relative to an ionisation chamber, which had been calibrated at the primary standards laboratory. As a complement to the measurements, the sensitivity of a KAP meter for various X-ray beam qualities was modelled using Monte Carlo simulations of photon transport and absorption. The result showed a variation in relative energy dependence of up to 30 %for KAP meters for RQC beam qualities compared with RQR qualities. A reduced sensitivity of KAP meters for heavily filtered beams in comparison with lightly filtered ones was found, and it is important that the beam-specific radiation quality correction factors are applied to correct the registered KAP values.}},
  author       = {{Herrnsdorf, L. and Petersson, H.}},
  issn         = {{0144-8420}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{347--352}},
  publisher    = {{Oxford University Press}},
  series       = {{Radiation Protection Dosimetry}},
  title        = {{Beam quality correction factors for KAP meters for lightlyand heavily filtered X-ray beams}},
  url          = {{http://dx.doi.org/10.1093/rpd/ncw042}},
  doi          = {{10.1093/rpd/ncw042}},
  volume       = {{169}},
  year         = {{2016}},
}