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Mobility determination of lead isotopes in glass for retrospective radon measurements

Laitinen, Mikko; Riihimaki, Iiro; Ekman, Jorgen; Sagari, A. R. Ananda; Karlsson, Lennart B.; Sangyuenyongpipat, Somjai; Gorelick, Sergey; Kettunen, Heikki; Penttila, Heikki and Hellborg, Ragnar LU , et al. (2008) In Radiation Protection Dosimetry 131(3). p.212-216
Abstract
In retrospective radon measurements, the 22-y half life of Pb-210 is used as an advantage. Pb-210 is often considered to be relatively immobile in glass after alpha recoil implanted by Rn-222 progenies. The diffusion of Pb-210 could, however, lead to uncertain wrong retrospective radon exposure estimations if Pb-210 is mobile and can escape from glass, or lost as a result of cleaning-induced surface modification. This diffusion was studied by a radiotracer technique, where Pb-209 was used as a tracer in a glass matrix for which the elemental composition is known. Using the ion guide isotope separator on-line technique, the Pb-209 atoms were implanted into the glass with an energy of 39 keV. The diffusion profiles and the diffusion... (More)
In retrospective radon measurements, the 22-y half life of Pb-210 is used as an advantage. Pb-210 is often considered to be relatively immobile in glass after alpha recoil implanted by Rn-222 progenies. The diffusion of Pb-210 could, however, lead to uncertain wrong retrospective radon exposure estimations if Pb-210 is mobile and can escape from glass, or lost as a result of cleaning-induced surface modification. This diffusion was studied by a radiotracer technique, where Pb-209 was used as a tracer in a glass matrix for which the elemental composition is known. Using the ion guide isotope separator on-line technique, the Pb-209 atoms were implanted into the glass with an energy of 39 keV. The diffusion profiles and the diffusion coefficients were determined after annealing at 470-620 degrees C and serial sectioning by ion sputtering. In addition, the effect of surface cleaning on diffusion was tested. From the Arrhenius fit, the activation enthalpy (H) was determined, which is equal to 3.2 +/- 0.2 eV, and also the pre-exponential factor D-0, in the order of 20 m(2)s(-1). This result confirms the assumption that over a time period of 50 y Pb-209 (and Pb-210) is effectively immobile in the glass. The boundary condition obtained from the measurements had the characteristic of a sink, implying loss of Pb-209 in the topmost surface at high temperatures. (Less)
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Contribution to journal
publication status
published
subject
in
Radiation Protection Dosimetry
volume
131
issue
3
pages
212 - 216
publisher
Nuclear Technology Publishing
external identifiers
  • wos:000260984100007
  • scopus:56749103256
ISSN
1742-3406
DOI
10.1093/rpd/ncn162
language
English
LU publication?
yes
id
2b1986ce-25df-4cb9-a10e-293b1d270e17 (old id 931312)
date added to LUP
2008-01-16 09:14:34
date last changed
2017-01-01 06:18:23
@article{2b1986ce-25df-4cb9-a10e-293b1d270e17,
  abstract     = {In retrospective radon measurements, the 22-y half life of Pb-210 is used as an advantage. Pb-210 is often considered to be relatively immobile in glass after alpha recoil implanted by Rn-222 progenies. The diffusion of Pb-210 could, however, lead to uncertain wrong retrospective radon exposure estimations if Pb-210 is mobile and can escape from glass, or lost as a result of cleaning-induced surface modification. This diffusion was studied by a radiotracer technique, where Pb-209 was used as a tracer in a glass matrix for which the elemental composition is known. Using the ion guide isotope separator on-line technique, the Pb-209 atoms were implanted into the glass with an energy of 39 keV. The diffusion profiles and the diffusion coefficients were determined after annealing at 470-620 degrees C and serial sectioning by ion sputtering. In addition, the effect of surface cleaning on diffusion was tested. From the Arrhenius fit, the activation enthalpy (H) was determined, which is equal to 3.2 +/- 0.2 eV, and also the pre-exponential factor D-0, in the order of 20 m(2)s(-1). This result confirms the assumption that over a time period of 50 y Pb-209 (and Pb-210) is effectively immobile in the glass. The boundary condition obtained from the measurements had the characteristic of a sink, implying loss of Pb-209 in the topmost surface at high temperatures.},
  author       = {Laitinen, Mikko and Riihimaki, Iiro and Ekman, Jorgen and Sagari, A. R. Ananda and Karlsson, Lennart B. and Sangyuenyongpipat, Somjai and Gorelick, Sergey and Kettunen, Heikki and Penttila, Heikki and Hellborg, Ragnar and Sajavaara, Timo and Helgesson, Johan and Whitlow, Harry J.},
  issn         = {1742-3406},
  language     = {eng},
  number       = {3},
  pages        = {212--216},
  publisher    = {Nuclear Technology Publishing},
  series       = {Radiation Protection Dosimetry},
  title        = {Mobility determination of lead isotopes in glass for retrospective radon measurements},
  url          = {http://dx.doi.org/10.1093/rpd/ncn162},
  volume       = {131},
  year         = {2008},
}