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Radiation Protection Dosimetry Advance Access originally published online on April 13, 2006
Radiation Protection Dosimetry 2006 120(1-4):480-484; doi:10.1093/rpd/nci688
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

LET dependence of bubble detector response to heavy ions

H. R. Andrews1, R. A. Noulty1, H. Ing1,*, F. d'Errico2, B. J. Lewis3, L. G. I. Bennett3 and A. R. Green3

1 Bubble Technology Industries, Chalk River, Ontario, Canada K0J 1J0
2 Department of Therapeutic Radiology, Yale University, School of Medicine, New Haven, CT 06510, USA
3 Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada K7K 7B4

* Corresponding author: ingh{at}bubbletech.ca

A series of experiments have been recently performed at the Heavy Ion Medical Accelerator in Chiba (HIMAC) laboratory to study the response of bubble detectors to high-mass high-energy (HZE) particles. The motivation for this study was to improve our ability to interpret measurements of neutron energy spectra in space. A recent analysis showed that emulsions of light halocarbons display common properties when they are characterised by a quantity called ‘reduced superheat’. This quantity evolved from the examination of neutron and gamma responses of many types of detectors. In this study, we describe direct irradiations with N, Ar and Kr charged particles at HIMAC. It was observed that when the linear energy transfer (LET) corresponding to bubble formation was plotted vs. reduced superheat, different curves were obtained for a particular ion for detectors at different temperatures. Different curves were also obtained when data from different ions were plotted. These results confirm that bubble nucleation is not a simple function of particle LET and that an analysis based on track-structure appears warranted.


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