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The varied radiological applications of tissue equivalent (TE) materialsencompass quality checks, diagnostic imaging and dose evaluations.Nevertheless, the availability of compounds representative of paediatricpatient tissues for scientific use in lower diagnostic photon energy spectra islimited. In this study, several TE substitutes were developed which replicatethe radiographic characteristics of human tissue within these energy ranges,i.e. TE materials for neonatal soft tissue (ESST-NB), neonatal skeletal tissue(ESTB-NB), and the equivalent tissue types representative of a 5 year old child(ESST and ESBT, respectively). The ORNL stylised computational model series wasused as a source for the desired elemental proportions. The density, effectiveatomic number, CT numbers and electron densities calculated for the developedtissue substitutes approximated those of the phantom system used as areference. Additionally, in keeping with the material choice and productionlimitations, as close correlations as possible were achieved for all thematerials in relation to the reference data for mass densities, massattenuation coefficients and mass energy-absorption coefficients. The TEsubstitutes for the newborn over an energy range of 47 keV to 66 keV exhibitedmaximum discrepancies for {\mu}/\r{ho} of 1.6% to -3.01%, and for{\mu}_en/\r{ho} of 1.15% to -1.4% in relation to the ORNL reference samples.The respective equivalent data ranges were 1.09 % to -3.02% and 1.92% to -2.53%for the TE materials representative of a 5-year-old. Given the excellentconcordance achieved between the newly constructed TE materials and thereference data, these compounds can subsequently be utilised to create physicalphantoms representative of tissue types in neonates and children aged 5 years.

Investigation of the aptness of newly developed epoxy-based equivalent tissues for newborn and 5-years old in paediatric radiology