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Establishing low-energy x-ray fields and determining operational dose equivalent conversion coefficients
Stockholm University, Faculty of Science, Medical Radiation Physics (together with KI).
2008 (English)Independent thesis Basic level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Reference radiation fields for x-ray qualities are described by the International Organization of Standards (ISO). This study describes the procedure to establish nine different low energy X-ray qualities at the national metrology laboratory, Swedish Radiation Protection Authority, following the document ISO 4037. Measurements of tube voltage, half-value layer, mean energy and spectral resolution have been performed for qualities N-15, N-20, N-25, N-30, N-40, L-20, L-30, L-35 and L-55. Furthermore, dose equivalent conversion coefficients for operational quantities ambient dose equivalent, personal dose equivalent and directional dose equivalent have been calculated by folding the mono-energetic conversion factors with measured spectral distributions of the x-ray qualities. The spectral distributions were unfolded from pulse-height distributions to photon distributions using simulated data of the semi-conductor detector used for measurements, generated with the Monte Carlo code PENELOPE.

Place, publisher, year, edition, pages
2008. , 60 p.
Keyword [en]
low energy x-rays, dose equivalent conversion coefficients, reference radiation fields, x-ray spectra, monte carlo simulation
National Category
Radiology, Nuclear Medicine and Medical Imaging
URN: urn:nbn:se:su:diva-8319OAI: diva2:200077
Available from: 2008-11-06 Created: 2008-11-06Bibliographically approved

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