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Radiation Protection Dosimetry Advance Access originally published online on January 18, 2005
Radiation Protection Dosimetry 2005 113(2):204-210; doi:10.1093/rpd/nch441
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Scientific Note

Experimental microdosimetric distributions of protons, from 19 to 65 MeV, using an A150-walled Low Pressure Proportional Counter

M. Takada*, H. Yamaguchi, H. Kitamura and K. Fujitaka

National Institute of Radiological Sciences, Chiba 263-8555, Japan

* Corresponding author: m_takada{at}nirs.go.jp.

Received April 20, 2004, amended November 9, 2004, accepted December 5, 2004

Microdosimetric distributions of protons, from 19 to 65 MeV, were measured using an A150-walled Low Pressure Proportional Counter at the cyclotron facility in the National Institute of Radiological Sciences. The measured distributions were found to be very different from the spectra assumed by the Continuous Slowing Down Approximation. The measurements consisted of determining the energy deposition by direct incident protons, by secondary electrons produced in the wall of the detector and by scattered protons at the wall. The secondary electron and the scattered proton distributions were studied using analytical functions and the MCNPX Monte Carlo code, respectively.


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