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Radiation Protection Dosimetry Advance Access published online on August 30, 2008
Radiation Protection Dosimetry, doi:10.1093/rpd/ncn239
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

COMPARISON OF DOUBLE DOSIMETRY ALGORITHMS FOR ESTIMATING THE EFFECTIVE DOSE IN OCCUPATIONAL DOSIMETRY OF INTERVENTIONAL RADIOLOGY STAFF

H. Järvinen1,*, N. Buls2, P. Clerinx2, S. Miljanic3, D. Nikodemová4, M. Ranogajec-Komor3, L. Struelens5 and F. d'Errico6,7

1 Radiation and Nuclear Safety Authority (STUK), Helsinki, Finland
2 University Hospital Brussels (UZ Brussels), Brussels, Belgium
3 Ruder Boskovic Institute, Zagreb, Croatia
4 Slovak Medical University in Bratislava, Bratislava, Slovakia
5 Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
6 Università degli Studi di Pisa, Pisa, Italy
7 Yale University, New Haven, CT, USA

* Corresponding author: hannu.jarvinen{at}stuk.fi

‘Double dosimetry’ i.e. measurement with two dosemeters, one located above the protective apron and one under has been recommended in interventional radiology (IR) to determine the effective dose to staff. Several algorithms have been developed to calculate the effective dose from the readings of the two dosemeters, but there is no international consensus on what is the best algorithm. In this work, a few of the most recently developed algorithms have been tested in typical IR conditions. The effective dose and personnel dosemeter readings were obtained experimentally by using thermoluminescent dosemeters in and on a Rando-Alderson phantom provided with a lead apron. In addition, the effective dose and personnel dosemeter readings were calculated by the Monte Carlo method for the same irradiation geometry. The results suggest that most of the algorithms overestimate effective dose in the selected IR conditions, but there is also a risk of underestimation by using the least conservative algorithms. Two of the algorithms seem to comply best with the chosen criteria of performance, i.e. no underestimation, minimum overestimation and close estimation of effective dose in typical IR conditions. However, it might not be justified to generalise the results. It is recommended that whenever personnel doses approach or exceed the dose limit, IR conditions should be further investigated and the possibility of over- or under-estimation of effective dose by the algorithm used should be considered.


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