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Radiation Protection Dosimetry Advance Access originally published online on July 20, 2004
Radiation Protection Dosimetry 2004 111(2):181-189; doi:10.1093/rpd/nch330
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Radiation Protection Dosimetry Vol. 111, No. 2 © Oxford University Press 2004; all rights reserved

Measured proton sensitivities of bubble detectors

Masashi Takada1,*, Hisashi Kitamura1, Tatsumi Koi1,{dagger}, Takashi Nakamura2 and Kazunobu Fujitaka1

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

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

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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