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Radiation Protection Dosimetry Advance Access published online on July 20, 2004
Radiation Protection Dosimetry, doi:10.1093/rpd/nch330
Copyright © 2004 Oxford University Press.
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Received November 11, 2003
Revised March 4, 2004
Accepted April 28, 2004

SCIENTIFIC AND TECHNICAL PAPER

MEASURED PROTON SENSITIVITIES OF BUBBLE DETECTORS

Masashi Takada 1*, Hisashi Kitamura 1, Tatsumi Koi 1, Takashi Nakamura 2, Kazunobu Fujitkata 1

1 National Institute of Radiological Sciences, Chiba 263-8555, Japan
2 Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8579, Japan

* To whom correspondence should be addressed. E-mail: m_takada{at}nirs.go.jp.


  Abstract

The neutron dose equivalent in aircraft is measured using commercial bubble detectors, but at high altitudes there are not only neutrons but also protons. Bubble detectors have been used because they are considered not to be sensitive to protons, but this has been the subject of only a few studies. In this study, by irradiating bubble detectors with energetic protons, the detectors' responses to protons were observed. Bubbles were clearly formed by protons, but the proton sensitivities were one order of magnitude smaller than the neutron sensitivities. Thus, counts of protons can be ignored in neutron measurements in aircraft.


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