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A newly designed Tissue Equivalent Proportional Counter (TEPC) has been developed for the CubeSat mission, SIGMA\ud(Scientific cubesat with Instruments for Global Magnetic field and rAdiation) to investigate space radiation. In order to test\udthe performance of the TEPC, we have performed heavy ion beam experiments with the Heavy Ion Medical Accelerator\udin Chiba (HIMAC), Japan. In space, human cells can be exposed to complex radiation sources, such as X-ray, Gamma ray,\udenergetic electrons, protons, neutrons and heavy charged particles in a huge range of energies. These generate much a\udlarger range of Linear Energy Transfer (LET) than on the ground and cause unexpected effects on human cells. In order to\udmeasure a large range of LET, from 0.3 to 1,000 keV/μm, we developed a compact TEPC which measures ionized particles\udproduced by collisions between radiation sources and tissue equivalent materials in the detector. By measuring LET\udspectra, we can easily derive the equivalent dose from the complicated space radiation field. In this HIMAC experiment, we\udsuccessfully obtained the linearity response for the TEPC with Fe 500 MeV/u and C 290 MeV/u beams and demonstrated\udthe performance of the active radiation detector

Calibration of TEPC for CubeSat Experiment to Measure Space Radiation