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Radiation Protection Dosimetry 2004 111(1):105-110; doi:10.1093/rpd/nch370
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Radiation Protection Dosimetry Vol. 111, No. 1 © Oxford University Press 2004; all rights reserved

(HP)Ge Measurement of spectra for diagnostic X-Ray beams

M. S. Nogueira1,*, H. C. Mota2 and L. L. Campos3

1 Centro de Desenvolvimento da Tecnologia Nuclear, R. Mário Werneck, S/N, 30123-970, Belo Horizonte, MG, Brazil
2 Instituto de Radioproteção e Dosimetria, Av. Salvador Allende S/N, 22780-160 Rio de Janeiro, RJ, Brazil
3 Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242 05505-000 São Paulo, SP, Brazil

* Corresponding author: mnogue{at}cdtn.br

The X-ray spectra applied in diagnostic radiology to the energy range between 50 and 125 kVp, were experimentally determined using a high-purity germanium detector, (HP)Ge, coupled to a multichannel analyser. A simple stripping procedure was implemented, according to that described by Seelentag and Panzer, to correct the pulse height distribution and then to determine the photon spectra. The measurements were performed for those conditions where the X-ray beam is transmitted through Pb filters 0.2–0.7 mm thick. It was necessary to estimate the effective dose in the same way that it is done for radiology diagnosis room shielding projects. The spectra were also determined to the X-ray qualities recommended by the IEC for primary diagnostic X-ray and for X-ray beams attenuated by aluminium filters 2.5–42.5 mm thick. The spectra obtained were compared with data derived from the literature presenting good agreement.


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