ICCHIBAN Project: Current Status

Planning long durations missions to Mars or a return to the moon has increased the importance of reliable radiation measurements for crew dosimetry. However at present, results from several radiation detectors do not agree with one another. In order to make sure that there is good agreement amongst space radiation detectors, especially for the high-LET galactic cosmic ray component, and in order to establish a standard heavy ion calibration for space radiation detectors, an intercomparison program called ICCHIBAN (InterComparison Cosmic-ray with Heavy Ion Beams At NIRS) Project was started in 2002. Since February 2002, two experiments for active detectors and two experiments for passive detectors have been performed with over 70 investigators participating. For active detectors, a 2 cm diameter, well characterized beam is used to expose each detector under identical conditions. For passive detectors, a 10 cm flattened beam is used for the exposures. The results from 1st and 2nd ICCHIBAN experiments are reported and analyzed in detail. The methodology and results of 1st to 4th ICCHIBAN run and future plans of the ICCHIBAN project are shown.COSPAR COLLOQUIUM, "Radiation Safety for Manned Mission to Mars