# Reduction of Radiation Effects in Biomedical Imaging Detectors by Technology Change

^{1}University of Douala, Cameroon^{2}University of Yaoundé , Cameroon

## Abstract

Silicon is a preferred material in the design of medical imaging detectors. It enables reliable and inexpensive detectors to be produced. However, the operation of this material is compromised when irradiated with high radiation of more than 5 ×10^{14} particles/cm^{2}of high energy neutrons. The defects caused transform the electrical properties. Therefore, this loss of information compromises the reconstruction of important events. This research paper aims to make a scientific contribution to the reduction of this radiation effects. The proposed solution is obtained by changing the silicon material generally used to design the detectors by a carbon nanotube material. The use of carbon nanotube material allows the detector to reduce the effects of radiation and leakage currents. A particular observation was made on the linear attenuation coefficient μ, the radiation length X_{0} and the width of the forbidden band Eg. Our results show the best characteristics for a carbon nanotube material compared to silicon. For a cross thermal section equal to σ_{Si }= σ_{c} = 2 ×10^{-3}b ,the carbon linear attenuation coefficient is great her than the silicon (μ_{Si} = 9.979 ×10^{-5}cm^{-1} <μ_{C} = 3.533 ×10^{-4}cm^{-1}), For a maximum effective cross section of equal diffusion σ_{C} = 1009 ×10^{-3}b, (μ_{Si} = 0.503 ×10^{-3} cm^{-1} <μ_{C} = 1.732 ×10^{-3} cm^{-1}), for a minimum effective cross section of equal diffusion σ_{Si} = σ_{C }= 10.09 ×10^{-3}b, μ_{Si} = 0.503 ×10^{-3} cm^{-1} <μ_{C} = 1.732 ×10^{-3} cm^{-1}. X_{0si} = 22.009 g/cm2 and X_{0c}= 42.969 g/cm^{2}, E_{gsi}= 1.2e.V and E_{gsi}= 5.5e.V. From these results, the carbon material has an attenuation coefficient at least three times higher than that of the silicon material.

**American Journal of Engineering and Applied Sciences**

**DOI:**https://doi.org/10.3844/ajeassp.2021.364.370

**Submitted On:**19 May 2021

**Published On:**17 July 2021

**How to Cite:** Auguste, E. S., Evariste, W. T., Salomon, M. & Jean, B. A. (2021). Reduction of Radiation Effects in Biomedical Imaging Detectors by Technology Change. *American Journal of Engineering and Applied Sciences*, *14*(3), 364-370. https://doi.org/10.3844/ajeassp.2021.364.370

**Copyright:** © 2021 Essesse Songa Auguste, Wembe Tafo Evariste, Madinatou Salomon and Belinga Aboudou Jean. This is an open access article distributed under the terms of the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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### Keywords

- Silicon
- Carbon
- Technology Change
- Radiation
- Biomedical Imaging
- Attenuation Coefficient
- Material