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Radiation Protection Dosimetry 2005 116(1-4):627-630; doi:10.1093/rpd/nci243
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Assessment of mammography spectra using compton spectrometry techniques

M. C. Burgos1, S. Gallardo1, V. Puchades2, G. Verdú1, J. Ródenas1,* and J. I. Villaescusa2

1 Departamento de Ingeniería Química y Nuclear, Universidad Politécnica de Valencia, Apartado 22012, E-46071 Valencia, Spain
2 Servicio de Protección Radiológica, Hospital La Fe de Valencia, Avenida Campanar, 46016, Valencia, Spain

* Corresponding author: jrodenas{at}iqn.upv.es

The quality control of mammography units is necessary to reduce the dose imparted to women as much as possible. An accurate characterisation of the primary X-ray spectra is very useful for this purpose. Primary spectra can be obtained using Compton spectrometry techniques. In this work, a commercial spectrometer used to characterise a mammography X-ray tube has been simulated using the Monte Carlo method by means of the MCNP code. Using the developed model, a Response matrix is obtained. Owing to the fact that this matrix is ill-conditioned, the inversion is not a simple process. This problem has been solved using the truncated singular value decomposition method. Results obtained when this methodology was applied have been compared with theoretical X-ray spectra.


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