open access

Vol 25, No 1 (2020)
Original research articles
Published online: 2020-01-01
Submitted: 2018-12-18
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Optimization of an ultra-fast silicon detector for proton and carbon beams using GEANT4 Monte Carlo toolkit

Mohsen Mashayekhi, Ali Asghar Mowlavi, Sayyed Bijan Jia, Hossein Ghayoumizadeh
DOI: 10.1016/j.rpor.2019.12.020
·
Rep Pract Oncol Radiother 2020;25(1):109-112.

open access

Vol 25, No 1 (2020)
Original research articles
Published online: 2020-01-01
Submitted: 2018-12-18

Abstract

Aim

The purpose of this study was to investigate the crosstalk effects between adjacent pixels in a thin silicon detector with 50um thickness.

Background

There are some limitations in the applications of detectors in hadron therapy. So it is necessary to have a detector with concurrent excellent time and resolution. In this work, the GEANT4 toolkit was applied to estimate the best value for energy cutoff in the thin silicon detector in order to optimize the detector.

Materials and Methods

GEANT4 toolkit was applied to simulate the transport and interactions of particles. Calculations were performed for a thin silicon detector (2cm×2cm×0.005cm) irradiated by proton and carbon ion beams. A two-dimensional array of silicon pixels in the x-y plane with 100um×100um×50um dimensions build the whole detector. In the end, the ROOT package is used to interpret and analyze the results

Results

It is seen that by the presence of energy cutoff, pixels with small deposited energy are ignored. The best values for energy cutoff are 0.01MeV and 0.7MeV for proton and carbon ion beams, respectively. By applying these energy cutoff values, efficiency and purity values are maximized and also minimum output errors are achieved.

Conclusions

The results are reasonable, good and useful to optimize the geometry of future silicon detectors in order to be used as beam monitoring in hadron therapy applications.

Abstract

Aim

The purpose of this study was to investigate the crosstalk effects between adjacent pixels in a thin silicon detector with 50um thickness.

Background

There are some limitations in the applications of detectors in hadron therapy. So it is necessary to have a detector with concurrent excellent time and resolution. In this work, the GEANT4 toolkit was applied to estimate the best value for energy cutoff in the thin silicon detector in order to optimize the detector.

Materials and Methods

GEANT4 toolkit was applied to simulate the transport and interactions of particles. Calculations were performed for a thin silicon detector (2cm×2cm×0.005cm) irradiated by proton and carbon ion beams. A two-dimensional array of silicon pixels in the x-y plane with 100um×100um×50um dimensions build the whole detector. In the end, the ROOT package is used to interpret and analyze the results

Results

It is seen that by the presence of energy cutoff, pixels with small deposited energy are ignored. The best values for energy cutoff are 0.01MeV and 0.7MeV for proton and carbon ion beams, respectively. By applying these energy cutoff values, efficiency and purity values are maximized and also minimum output errors are achieved.

Conclusions

The results are reasonable, good and useful to optimize the geometry of future silicon detectors in order to be used as beam monitoring in hadron therapy applications.

Get Citation

Keywords

Silicon detector; Energy cutoff; GEANT4 toolkit; Hadron therapy

About this article
Title

Optimization of an ultra-fast silicon detector for proton and carbon beams using GEANT4 Monte Carlo toolkit

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 25, No 1 (2020)

Pages

109-112

Published online

2020-01-01

DOI

10.1016/j.rpor.2019.12.020

Bibliographic record

Rep Pract Oncol Radiother 2020;25(1):109-112.

Keywords

Silicon detector
Energy cutoff
GEANT4 toolkit
Hadron therapy

Authors

Mohsen Mashayekhi
Ali Asghar Mowlavi
Sayyed Bijan Jia
Hossein Ghayoumizadeh

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