Abstract
We have developed MGGPOD, a suite of Monte Carlo codes built around the widely used GEANT (Version 3.21) package, to simulate ab initio the physical processes relevant for the production of instrumental backgrounds. These include the build-up and delayed decay of radioactive isotopes as well as the prompt de-excitation of excited nuclei, both of which give rise to a plethora of instrumental γ-ray background lines in addition to continuum background. We demonstrate the capabilities of the MGGPOD suite by modelling high resolution γ-ray spectra recorded by the Transient Gamma-Ray Spectrometer (TGRS) on board Wind and the SPI spectrometer on board the recently launched INTEGRAL observatory.
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