Journal Article

Evaluation of solid state nuclear track detector stacks exposed on the international space station

J.K. Pálfalvi, Yu. Akatov, J. Szabó, L. Sajó-Bohus and I. Eördögh

in Radiation Protection Dosimetry

Volume 110, issue 1-4, pages 393-397
Published in print August 2004 | ISSN: 0144-8420
Published online August 2004 | e-ISSN: 1742-3406 | DOI: https://dx.doi.org/10.1093/rpd/nch140
Evaluation of solid state nuclear track detector stacks exposed on the international space station

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The aim of the study was to investigate the contribution of secondary neutrons to the total dose inside the International Space Station (ISS). For this purpose solid-state nuclear track detector (SSNTD) stacks were used. Each stack consisted of three CR-39 sheets. The first and second sheets were separated by a Ti plate, and the second and third sheets sandwiched a Lexan polycarbonate foil. The neutron and proton responses of each sheet were studied through MC calculations and experimentally, utilising monoenergetic protons. Seven stacks were exposed in 2001 for 249 days at different locations of the Russian segment ‘Zvezda’. The total storage time before and after the exposure onboard was estimated to be seven months. Another eight stacks were exposed at the CERF high-energy neutron field for calibration purposes.

The CR-39 detectors were evaluated in four steps: after 2, 6, 12 and 20 h etching in 6 N NaOH at 70°C (VB = 1.34 µm h−1). All the individual tracks were investigated and recorded using an image analyser. The stacks provided the averaged neutron ambient dose equivalent (H*) between 200 keV and 20 MeV, and the values varied from 39 to 73 μSv d−1, depending on the location. The Lexan detectors were used to detect the dose originating from high-charge and high-energy (HZE) particles. These results will be published elsewhere.

Journal Article.  2897 words.  Illustrated.

Subjects: Nuclear Chemistry, Photochemistry, and Radiation

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