Abstract ID: 69 Validation of XRMC Monte Carlo toolkit for external dosimetry applied to mammography.

The objective of this project is to validate for macroscopic quantities the xrmc toolkit version 6.5.0-2 [1] , comparing against experimental data collected for dosimetric applications in mammography (external dosimetry). The xrmc is focused on X-ray photon transport simulation, and makes extensive use of variance reduction techniques. To validate the simulated quantities a database was generated/organized with experimental data collected from three different mammographic equipments (Mammomat Inspiration, Mammomat 3000 and LORAD MIII). The KERMA, exposure, half-value-layer (HVL) and backscattering (BSF) were the quantities used in the study. The evoked modes on simulation transport for xrmc toolkit were: transmission mode and mode with scattering. This is an ongoing work and at the moment the data analyzes have been partially performed. To evaluate the differences in results due the differences on description of the incident spectra it was modeled spectra from two different resources: catalogue IPEM Report 78 [2] and the spectra generated to Lorad MIII equipment based on model published by Tucker et al. 1991 [3] . The preliminary results show good agreement between xrmc and experimental data for HVL. We are planning to present the complete set of absolute and derived quantities comparing each transport model. This is a preliminary evaluation of the toolkit where its interface and its options in the devices are being tested and few changes in the code are being defined to make xrmc more user friendly and more adequate to simulate external dosimetry in mammography. Research developed with the partial support of the National Supercomputing Center, Federal University of Rio Grande do Sul. [ABSTRACT FROM AUTHOR]