NDLI: Doppler broadening of energy spectra in Compton cameras

Content Provider	IEEE Xplore Digital Library
Author	Ordonez, C.E. Bolozdynya, A. Chang, W.
Copyright Year	1998
Description	Author affiliation: Dept. of Med. Phys., St. Lukes Med. Center, Chicago, IL, USA (Ordonez, C.E.)
Abstract	Compton cameras utilize the Compton effect to achieve directional localization of gamma rays. The accuracy of the localization depends, in part, on the uncertainties in the measurement of energies. These uncertainties have conventionally been assumed to be due to the effects of finite detector energy resolution alone. There is another source of energy uncertainty that none of the Compton cameras proposed or built thus far accounts for the Doppler broadening of energy spectra that arises from the Compton interaction between gamma rays and moving electrons bound to atoms. The authors have used Monte Carlo simulations and direct calculations to demonstrate that the energy uncertainties due to Doppler broadening are non-negligible. For low-energy gamma rays, these uncertainties are generally more significant than those due to the finite energy resolutions of semiconductor detectors (for example, germanium and silicon). Expressions for estimating the angular uncertainties in Compton cameras due to energy resolution and Doppler broadening are derived. The authors conclude that the accuracy of the calculation of the scatter angle can be improved if the electron pre-collision momentum is known. However, even without such knowledge. Compton cameras still have the potential to achieve spatial resolutions that are comparable to those of mechanically collimated systems.
Starting Page	1361
Ending Page	1365
File Size	523103
Page Count	5
File Format	PDF
ISBN	0780342585
ISSN	10823654
DOI	10.1109/NSSMIC.1997.670574
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-11-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cameras Energy resolution Gamma rays Electrons Gamma ray effects Energy measurement Measurement uncertainty Gamma ray detection Gamma ray detectors Germanium
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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