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Radiation Protection Dosimetry Advance Access originally published online on January 19, 2008
Radiation Protection Dosimetry 2008 130(2):224-227; doi:10.1093/rpd/ncm492
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Portable TL dosemeter—ESD phantom combination for chest and lumbar spine radiography

Henri Niittymäki1, Arvi Hakanen2,*, Simo Rautio2 and Hannu Järvinen2

1 Department of Physics, University of Helsinki, Helsinki, Finland
2 STUK – Radiation and Nuclear Safety Authority, PO Box 14, FIN-00881 Helsinki, Finland

* Corresponding author: arvi.hakanen{at}stuk.fi

Received August 31, 2007, amended November 3, 2007, accepted December 5, 2007

A thermoluminescence dosemeter (TLD)—entrance surface dose (ESD) phantom combination was calibrated in terms of air-kerma in IEC RQR X-ray radiation qualities between 50 and 150 kV. The ESD phantom was designed and constructed as a part of the work. With the combination, air-kermas were measured for four radiological examinations (two chest and two lumbar spine examinations in two hospitals), and converted to ESDa using Monte–Carlo calculated BSF data tabulated for different tube voltages, filtrations and beam diameters at 1 m distance. The results agreed with the ionisation-chamber measurements within the reported overall uncertainty of the TLD method. In the calibration, the ESD phantom can be replaced by the ISO water slab phantom unaffecting the reported overall uncertainty. Backscatter-related parameters for the ISO water slab phantom and the newly designed ESD phantom were determined for the IEC RQR qualities used in the secondary standard dosimetry laboratory of STUK at 1 m distance, including an approximate Hp(10)/Hp(0.07) ratio.


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