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Environmental dose rate heterogeneity of beta radiation and its implications for luminescence dating: Monte Carlo modelling and experimental validation

Nathan, RP; Thomas, Puthusserry LU ; Jain, M; Murray, AS and Rhodes, EJ (2003) In Radiation Measurements 37(4-5). p.305-313
Abstract
The recent development of rapid single sand-sized grain analyses in luminescence dating has necessitated the accurate interpretation of D-e distributions to recover a representative D-e acquired since the last bleaching event. Beta heterogeneity may adversely affect the variance and symmetry of D-e distributions and it is important to characterise this effect, both to ensure that dose distributions are not misinterpreted, and that an accurate beta dose rate is employed in dating calculations. In this study, we make a first attempt providing a description of potential problems in heterogeneous environments and identify the likely size of these effects on D-e distributions. The study employs the MCNP 4C Monte Carlo electron/photon transport... (More)
The recent development of rapid single sand-sized grain analyses in luminescence dating has necessitated the accurate interpretation of D-e distributions to recover a representative D-e acquired since the last bleaching event. Beta heterogeneity may adversely affect the variance and symmetry of D-e distributions and it is important to characterise this effect, both to ensure that dose distributions are not misinterpreted, and that an accurate beta dose rate is employed in dating calculations. In this study, we make a first attempt providing a description of potential problems in heterogeneous environments and identify the likely size of these effects on D-e distributions. The study employs the MCNP 4C Monte Carlo electron/photon transport model, supported by an experimental validation of the code in several case studies. We find good agreement between the experimental measurements and the Monte Carlo simulations. It is concluded that the effect of beta, heterogeneity in complex environments for luminescence dating is two fold: (i) the infinite matrix dose rate is not universally applicable; its accuracy depends on the scale of the heterogeneity, and (ii) the interpretation of D-e distributions is complex and techniques which reject part of the D-e distribution may lead to inaccurate dates in some circumstances. (C) 2003 Elsevier Science Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
beta dose, radiation heterogeneity, luminescence dating
in
Radiation Measurements
volume
37
issue
4-5
pages
305 - 313
publisher
Elsevier
external identifiers
  • wos:000184110400005
  • scopus:0038142182
ISSN
1879-0925
DOI
language
English
LU publication?
yes
id
e2ef3601-7749-4234-82c0-9697d4fe8d7c (old id 306250)
date added to LUP
2007-09-18 15:06:11
date last changed
2018-05-29 10:59:11
@article{e2ef3601-7749-4234-82c0-9697d4fe8d7c,
  abstract     = {The recent development of rapid single sand-sized grain analyses in luminescence dating has necessitated the accurate interpretation of D-e distributions to recover a representative D-e acquired since the last bleaching event. Beta heterogeneity may adversely affect the variance and symmetry of D-e distributions and it is important to characterise this effect, both to ensure that dose distributions are not misinterpreted, and that an accurate beta dose rate is employed in dating calculations. In this study, we make a first attempt providing a description of potential problems in heterogeneous environments and identify the likely size of these effects on D-e distributions. The study employs the MCNP 4C Monte Carlo electron/photon transport model, supported by an experimental validation of the code in several case studies. We find good agreement between the experimental measurements and the Monte Carlo simulations. It is concluded that the effect of beta, heterogeneity in complex environments for luminescence dating is two fold: (i) the infinite matrix dose rate is not universally applicable; its accuracy depends on the scale of the heterogeneity, and (ii) the interpretation of D-e distributions is complex and techniques which reject part of the D-e distribution may lead to inaccurate dates in some circumstances. (C) 2003 Elsevier Science Ltd. All rights reserved.},
  author       = {Nathan, RP and Thomas, Puthusserry and Jain, M and Murray, AS and Rhodes, EJ},
  issn         = {1879-0925},
  keyword      = {beta dose,radiation heterogeneity,luminescence dating},
  language     = {eng},
  number       = {4-5},
  pages        = {305--313},
  publisher    = {Elsevier},
  series       = {Radiation Measurements},
  title        = {Environmental dose rate heterogeneity of beta radiation and its implications for luminescence dating: Monte Carlo modelling and experimental validation},
  url          = {http://dx.doi.org/},
  volume       = {37},
  year         = {2003},
}