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In vivo measurement of pre-operational spallation source workers : Baseline body burden levels and detection limits of relevant gamma emitters using high-resolution gamma spectrometry

Raaf, Christopher L. LU ; Almén, Anja LU ; Johansson, Lena LU and Stenström, Kristina Eriksson LU (2019) In Journal of Radiological Protection 40(1). p.119-133
Abstract

As a measure to prepare for long-term internal dose monitoring of workers at the European Spallation Source (ESS) in Lund, Sweden, operated by the European Research Infrastructure Consortium (ERIC), as well as to enhance emergency preparedness against accidental releases, a series of in vivo measurements were conducted using a high-resolution HPGe detector with a 123% relative efficiency (1.332 MeV). This study describes the whole-body counting set-up, calibration procedure, and subsequent validation measurements using conventional NaI(Tl)-scanning-bed geometry on a selection of workers from the ESS. Detection limits for the relevant gamma emitters 7Be, 172Hf, and 182Ta were determined to be 65 Bq, 130... (More)

As a measure to prepare for long-term internal dose monitoring of workers at the European Spallation Source (ESS) in Lund, Sweden, operated by the European Research Infrastructure Consortium (ERIC), as well as to enhance emergency preparedness against accidental releases, a series of in vivo measurements were conducted using a high-resolution HPGe detector with a 123% relative efficiency (1.332 MeV). This study describes the whole-body counting set-up, calibration procedure, and subsequent validation measurements using conventional NaI(Tl)-scanning-bed geometry on a selection of workers from the ESS. Detection limits for the relevant gamma emitters 7Be, 172Hf, and 182Ta were determined to be 65 Bq, 130 Bq, and 22 Bq, respectively, using a 2400 s acquisition time. The baseline measurements suggest that care must be taken to ensure that the fluctuations in the presence of radon daughters 214Bi and 214Pb are minimised by, for example, ensuring a minimum air exchange between the measuring room and the ambient air, and by demanding that the measured subjects change clothes and shower before measurement. Furthermore, in a monitoring program for internal doses to spallation source workers, the presence of radionuclides originating from non-work-related sources (such as 226Ra from private water wells or 137Cs from intakes of Chernobyl contaminated foodstuffs), or radionuclides from previous work history (such as 60Co within the nuclear power industry), must be considered.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
detection limit, European research infrastructure consortium ERIC, European spallation source, high-resolution whole-body counting, occupational exposure
in
Journal of Radiological Protection
volume
40
issue
1
pages
15 pages
publisher
IOP Publishing
external identifiers
  • scopus:85080887233
  • pmid:31469088
ISSN
0952-4746
DOI
10.1088/1361-6498/ab3ec9
language
English
LU publication?
yes
id
5847df50-a272-4304-a5c6-c6360ba01457
date added to LUP
2020-03-19 15:21:55
date last changed
2021-02-17 05:55:38
@article{5847df50-a272-4304-a5c6-c6360ba01457,
  abstract     = {<p>As a measure to prepare for long-term internal dose monitoring of workers at the European Spallation Source (ESS) in Lund, Sweden, operated by the European Research Infrastructure Consortium (ERIC), as well as to enhance emergency preparedness against accidental releases, a series of in vivo measurements were conducted using a high-resolution HPGe detector with a 123% relative efficiency (1.332 MeV). This study describes the whole-body counting set-up, calibration procedure, and subsequent validation measurements using conventional NaI(Tl)-scanning-bed geometry on a selection of workers from the ESS. Detection limits for the relevant gamma emitters <sup>7</sup>Be, <sup>172</sup>Hf, and <sup>182</sup>Ta were determined to be 65 Bq, 130 Bq, and 22 Bq, respectively, using a 2400 s acquisition time. The baseline measurements suggest that care must be taken to ensure that the fluctuations in the presence of radon daughters <sup>214</sup>Bi and <sup>214</sup>Pb are minimised by, for example, ensuring a minimum air exchange between the measuring room and the ambient air, and by demanding that the measured subjects change clothes and shower before measurement. Furthermore, in a monitoring program for internal doses to spallation source workers, the presence of radionuclides originating from non-work-related sources (such as <sup>226</sup>Ra from private water wells or <sup>137</sup>Cs from intakes of Chernobyl contaminated foodstuffs), or radionuclides from previous work history (such as <sup>60</sup>Co within the nuclear power industry), must be considered.</p>},
  author       = {Raaf, Christopher L. and Almén, Anja and Johansson, Lena and Stenström, Kristina Eriksson},
  issn         = {0952-4746},
  language     = {eng},
  number       = {1},
  pages        = {119--133},
  publisher    = {IOP Publishing},
  series       = {Journal of Radiological Protection},
  title        = {In vivo measurement of pre-operational spallation source workers : Baseline body burden levels and detection limits of relevant gamma emitters using high-resolution gamma spectrometry},
  url          = {http://dx.doi.org/10.1088/1361-6498/ab3ec9},
  doi          = {10.1088/1361-6498/ab3ec9},
  volume       = {40},
  year         = {2019},
}