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Radiation Protection Dosimetry 2004 110(1-4):325-331; doi:10.1093/rpd/nch115
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Superheated emulsions as high-energy neutron dosemeters

Mala Das1, Teruko Sawamura1,*, Masashi Abe1, Junichi H. Kaneko1, Akira Homma1, Fumiyuki Fujita1, Shuichi Tsuda2 and Takeo Nishitani2

1 Department of Quantum Energy Engineering, Graduate School of Engineering, Hokkaido University, Kita-13 Nishi-8, Kita-Ku, Sapporo, Hokkaido 060-8628, Japan
2 Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan

* Corresponding author: sawamura{at}eng.nokudai.ac.jp

Superheated emulsions being inexpensive, easy to fabricate, and having tissue equivalent composition make them as one of the popular neutron dosemeters. One more advantage is that they can be made insensitive to gamma rays by the choice of the sensitive liquid. It is observed that the response of commercially available bubble detector to neutron decreases above 20 MeV while its response is roughly flat in the 0.1–15 MeV region. This restricts its application as a dosemeter to high-energy neutrons. The response of bubble detector from Bubble Technology Industries, has been observed by using Pb-breeder for high-energy neutrons from different facilities in Japan. It is observed that 2–3 cm Pb-breeder is effective in increasing the response of the detector to the nominal value. Theoretical calculation using MCNPX code indicates an increase in neutrons in the energy range of 0.1–10 MeV with Pb-breeder. The present work indicates the possibility of using the bubble detector as a dosemeter to high-energy neutron using a Pb-breeder of proper thickness.


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