Track-etched detectors are commonly used also for radiation monitoring onboard International Space Station. To be registered in track-etched detectors, the particle needs to meet several criteria-it must have linear energy transfer above the detection threshold and strike the detector's surface under an angle higher than the so-called critical angle. Linear energy transfer is then estimated from calibration curve from the etch rate ratio V that is calculated from parameters of individual tracks appearing on the detector's surface after chemical etching. It has been observed that V can depend on the incident angle and this dependence can vary for different detector materials, etching and evaluating conditions. To investigate angular dependence, detectors (Harzlas TD-1) were irradiated at HIMAC by several ions under angles from 0° to 90°. The correction accounting not only for critical angle but also for dependence of V on the incident angle is introduced and applied to spectra measured onboard International Space Station.

Department of Radiation Dosimetry Nuclear Physics Institute of the Czech Academy of Sciences Na Truhlářce 39 64 18000 Prague Czech Republic

Institute for Biomedical Problems of the Russian Academy of Sciences Khoroshevskoye Shosse 76A Moscow 123007 Russian Federation

National Institute of Radiological Sciences National Institutes for Quantum and Radiological Science and Technology 4 9 1 Anagawa Inage Chiba 263 8555 Japan

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