Establishing low-energy x-ray fields and determining operational dose equivalent conversion coefficients
Independent thesis Basic level (professional degree), 20 credits / 30 HE creditsStudent thesis
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.
low energy x-rays, dose equivalent conversion coefficients, reference radiation fields, x-ray spectra, monte carlo simulation
Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:su:diva-8319OAI: oai:DiVA.org:su-8319DiVA: diva2:200077
Persson, Linda, Fil. DrGrindborg, Jan-Erik
Nilsson, Bo, Docent