Directionally-Sensitive Personal Wearable Radiation Dosimeter

In this paper, the authors propose a personal
wearable directionally-sensitive radiation dosimeter using multiple
semiconductor CdZnTe detectors. The proposed dosimeter not only
measures the real-time dose rate but also provide the direction of the
radioactive source. A linear relationship between radioactive source
direction and the radiation intensity measured by each detectors is
established and an equation to determine the source direction is
derived by the authors. The efficiency and accuracy of the proposed
dosimeter is verified by simulation using Geant4 package. Results
have indicated that in a measurement duration of about 7 seconds,
the proposed dosimeter was able to estimate the direction of a 10μCi
137/55Cs radioactive source to within 2 degrees.

Authors:

• Hai Huu Le
• Paul Junor
• Moshi Geso
• Graeme O’Keefe

Keywords:

• Dose rate
• Geant4 package
• radiation detectors
• radioactive source direction.

References:

[1] I. Orion, A. Pernick, D. Ilzycer, and H. Zafrir, Locating gamma radiation
source by self collimating BGO detector system, Israel Nuclear Society,
Conference of the Israel Nuclear Societies, 9-10 Dec 1996, 1-4.
[2] J.L. Matteson, M.A. Capote, R.T. Skelton, B. Greg, S. Edwin, R. Richard,
H. George, G. Tom and P. Michael, A Directional Gamma Radiation
Spectrometer Based on Pixelated CZT Arrays and Coded Mask Apertures,
Nuclear Science Symposium Conference Record, 2006, 87-92.
[3] J. Uher, C. Frojdh, S. Pospisil, G. Thungstrom and Z. Vykydal,
Directional radiation detector, Nuclear Science Symposium Conference
Record, 2007, 1162-1165.
[4] M.Willis, S. Skutnik and H. Hall, Detection and positioning of radioactive
sources using a four-detector response algorithm, Nuclear Instruments
and Methods in Physics Research, Section A: Accelerators, Spectrometers,
Detectors and Associated Equipment, 2014, 445-452.
[5] Geant4 Collaboration, Geant4 User’s Guide for Application Developers,
http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/
BackupVersions/V10.2/fo/BookForAppliDev.pdf,
accessed on 20/05/2016.
[6] S.D. Sordo, L. Abbene, E. Caroli, A.M. Mancini, A. Zappettini,
and P. Ubertini, Progress in the Development of CdTe and CdZnTe
Semiconductor Radiation Detectors for Astrophysical and Medical
Applications, Sensors 9, doi:10.3390/s90503491, 2009, 3491-3526