Photon dosimetry using plastic scintillators in pulsed radiation fields

David L. Chichester; Brandon W. Blackburn; James T. Johnson; Scott M. Watson

doi:10.1117/12.722929

10 May 2007 Photon dosimetry using plastic scintillators in pulsed radiation fields

David L. Chichester, Brandon W. Blackburn, James T. Johnson, Scott M. Watson

Proceedings Volume 6540, Optics and Photonics in Global Homeland Security III; 65401K (2007) https://doi.org/10.1117/12.722929
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

Simulations and experiments have been carried out to explore using a plastic scintillator as a dosimetry probe in the vicinity of a pulsed bremsstrahlung source in the range 4 to 20 MeV. Taking advantage of the tissue-equivalent properties of this detector in conjunction with the use of a fast digital signal processor near real-time dosimetry was shown to be possible. The importance of accounting for a broad energy electron beam in bremsstrahlung production, and photon scattering and build-up, in correctly interpreting dosimetry results at long stand-off distances is highlighted by comparing real world experiments with ideal geometry simulations. Close agreement was found between absorbed energy calculations based upon spectroscopic techniques and calculations based upon signal integration, showing a ratio between 10 MeV absorbed dose to 12 MeV absorbed dose of 0.58 at a distance of 91.4 m from the accelerator. This is compared with an idealized model simulation with a monoenergetic electron beam and without scattering, where the ratio was 0.46.

Citation Download Citation

David L. Chichester, Brandon W. Blackburn, James T. Johnson, and Scott M. Watson "Photon dosimetry using plastic scintillators in pulsed radiation fields", Proc. SPIE 6540, Optics and Photonics in Global Homeland Security III, 65401K (10 May 2007); https://doi.org/10.1117/12.722929

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