Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Simulation of Detector Response: How Does the Electron Multiplication Differ Within Ionization Chambers with Various Geometries?
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Simulering av detektorrespons : Hur skiljer sig elektronmultiplikationen åt inom jonisationskammare med varierande geometrier? (Swedish)
Abstract [en]

This degree project was performed in collaboration with the division of nuclear physics at the department of physics, KTH Royal Institute of Technology. A partial goal of the project was to create a simulation model, where the relationship be- tween the multiplication of electrons that occurs in an ionization chamber and the different pressures of air in the detector could be visualized. The main goal was then to use this model in order to examine the behaviour of electron multiplication for different geometries of the simulated ionization chamber. The simulation was performed in Python 3.7 (Python Soft- ware Foundation, DE, United States), and geometry was modified by increasing and decreasing the simulated inner and anode wire radius of the chamber. Results showed that the peak of the multiplication curve occurred at different pressures for different geometries. When the anode wire radius was fixed, the peak occurred at a lower pressure for an increase of the inner radius, whereas, when the inner radius was fixed, the peak occurred at a higher pressure for an increase of the anode wire radius. The number of created electrons are dependent of Townsend’s coefficent, α, which in turn is dependent of the relationship between pressure and electric field strength. The electric field strength within an ionization chamber varies for different geometries, and therefore is the relationship between pressure and electric field that results in the max- imum value of α, and thus the maximum peak of the multiplication factor, consequently given by different pressures for different chamber geometries. If the results from the simulations in this project are to correspond with actual experimental data, the knowledge of this geometry-dependence may be used to include or exclude the multiplication peak in further measurements depending upon preference.

Place, publisher, year, edition, pages
2019.
Series
TRITA-CBH-GRU ; 2019:062
Keywords [en]
nuclear physics, simulation model, ionization chamber, electron multiplication, Python 3.7, inner radius, anode wire radius, electric field strength, multiplication peak
National Category
Other Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-253793OAI: oai:DiVA.org:kth-253793DiVA, id: diva2:1326223
Subject / course
Medical Engineering
Educational program
Master of Science in Engineering - Medical Engineering
Supervisors
Examiners
Available from: 2019-06-20 Created: 2019-06-17 Last updated: 2019-06-20Bibliographically approved

Open Access in DiVA

fulltext(853 kB)27 downloads
File information
File name FULLTEXT01.pdfFile size 853 kBChecksum SHA-512
ef7dd29ebf9b0f5111ca7415c9eda85d4685ab8b64a5f0c5b64b360ae3a29484220b4bdc6aaf9adb49b60245cde1e8e177c99232d7b35994f049212aa895f2e0
Type fulltextMimetype application/pdf

By organisation
Biomedical Engineering and Health Systems
Other Medical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 27 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 115 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf