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Radiation Protection Dosimetry Advance Access originally published online on March 23, 2005
Radiation Protection Dosimetry 2005 113(4):359-365; doi:10.1093/rpd/nch476
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Angular dependence of the TL reading of thin {alpha}-Al2O3:C dosemeters exposed to different beta spectra

Pietro Mancosu1, Dario Ripamonti1, Ivan Veronese1,2, Marie Claire Cantone1,2, Augusto Giussani1,2,* and Giampiero Tosi3

1 Dipartimento di Fisica, Università degli Studi di Milano, Sezione di Fisica Medica, via Celoria 16, I-20133 Milano, Italy
2 INFN, Sezione di Milano, via Celoria 16, I-20133 Milano, Italy
3 Istituto Europeo di Oncologia, via Ripamonti 435, I-20141 Milano, Italy

* Corresponding author: augusto.giussani{at}unimi.it

Received January 3, 2005, amended February 17, 2005, accepted February 22, 2005

The angular dependence of the thermoluminescent (TL) signal of thin {alpha}-Al2O3:C dosemeters was investigated for a series of beta-emitting radionuclides commonly employed in nuclear medicine and characterised by different mean energies (99Tc, 177Lu, 90Sr/90Y and 90Y). Irradiations were performed in a controlled geometry, using a properly designed irradiator intended to realistically reproduce the situation of exposure of hospital personnel to beta-emitting pharmaceuticals. Under the conditions of extended source and short source to detector distance, the TL signal of thin {alpha}-Al2O3:C layers per unit irradiation time was observed to be independent on the angle of incidence within acceptable limits, particularly for those radionuclides with maximum energy >500 keV. This property may be easily explained by using simple physical considerations, such as the limited thickness of the dosemeters. The results confirm that these detectors are suitable for beta-ray extremity dose measurements, when the photon contribution is negligible, as in the case considered.


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