Evaluation of solid state nuclear track detector stacks exposed on the international space station
| Autor: | Laszlo Sajo-Bohus, J.K. Pálfalvi, I. Eördögh, Yu. Akatov, J. Szabó |
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| Rok vydání: | 2004 |
| Předmět: |
Internationality
Materials science Proton Transducers Analytical chemistry Radiation Dosage Sensitivity and Specificity Radiation Protection Stack (abstract data type) Occupational Exposure Calibration Radiology Nuclear Medicine and imaging Neutron Radiometry FOIL method Neutrons Radioisotopes Radiation Radiological and Ultrasound Technology Equivalent dose Detector Public Health Environmental and Occupational Health Reproducibility of Results Environmental Exposure Equipment Design General Medicine Space Flight Solid-state nuclear track detector Equipment Failure Analysis Body Burden Cosmic Radiation Relative Biological Effectiveness |
| Zdroj: | Radiation Protection Dosimetry. 110:393-397 |
| ISSN: | 1742-3406 0144-8420 |
| DOI: | 10.1093/rpd/nch140 |
| Popis: | 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 degrees C (VB = 1.34 microm 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 microSv 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. |
| Databáze: | OpenAIRE |
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