Journal Article

Bubble-detector measurements of neutron radiation in the international space station: ISS-34 to ISS-37

M. B. Smith, S. Khulapko, H. R. Andrews, V. Arkhangelsky, H. Ing, M. R. Koslowksy, B. J. Lewis, R. Machrafi, I. Nikolaev and V. Shurshakov

in Radiation Protection Dosimetry

Volume 168, issue 2, pages 154-166
Published in print February 2016 | ISSN: 0144-8420
Published online April 2015 | e-ISSN: 1742-3406 | DOI: https://dx.doi.org/10.1093/rpd/ncv181
Bubble-detector measurements of neutron radiation in the international space station: ISS-34 to ISS-37

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Bubble detectors have been used to characterise the neutron dose and energy spectrum in several modules of the International Space Station (ISS) as part of an ongoing radiation survey. A series of experiments was performed during the ISS-34, ISS-35, ISS-36 and ISS-37 missions between December 2012 and October 2013. The Radi-N2 experiment, a repeat of the 2009 Radi-N investigation, included measurements in four modules of the US orbital segment: Columbus, the Japanese experiment module, the US laboratory and Node 2. The Radi-N2 dose and spectral measurements are not significantly different from the Radi-N results collected in the same ISS locations, despite the large difference in solar activity between 2009 and 2013. Parallel experiments using a second set of detectors in the Russian segment of the ISS included the first characterisation of the neutron spectrum inside the tissue-equivalent Matroshka-R phantom. These data suggest that the dose inside the phantom is ∼70 % of the dose at its surface, while the spectrum inside the phantom contains a larger fraction of high-energy neutrons than the spectrum outside the phantom. The phantom results are supported by Monte Carlo simulations that provide good agreement with the empirical data.

Journal Article.  6507 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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