Variance reduction for collimated gamma detector geometry in Serpent

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sem_kähkönen_topias_2022.pdf (3.28 MB)

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School of Science | S harjoitus- ja seminaarityöt
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2022

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Teknillisen fysiikan laitos
Department of Applied Physics

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en

Pages

29

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PHYS-E0441 - Physics Special Assignment V

Abstract

The potential of modeling the photon transport in passive gamma emission tomography (PGET) with Serpent is restricted by the computational demand of the simulation using conventional particle tracking routines. However, the analog tracking process can be altered to improve the computational efficiency of the Monte Carlo simulation. In this thesis, a variance reduction scheme utilizing splitting and modified direction sampling is developed and implemented in Serpent. The implementation is verified in a simple test geometry and the method is demonstrated in a PGET gamma-radiation transport. As a result, a factor of 13 or greater improvement was successfully obtained compared to the analog simulation. On the contrary, further development would be required to provide a user interface for input parameter adjustments needed for any generalizations of the method.

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variance reduction, passive gamma emission tomography, Serpent

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https://urn.fi/URN:NBN:fi:aalto-202206234186

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[sem] Perustieteiden korkeakoulu / SCI