30P-B-10 290MeV/u重イオン入射ガンマ線生成二重微分断面積の測定(医療物理,一般講演)

概要

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Radiation dose by γ-rays produced by heavy ion induced nuclear reactions around malignant tumor is essential for dose assessment and radiation safety design in adittion to dose by neutrons. Double differential cross section (DDX) of γ-ray production is one of essential data for dose estimation by radiation transport codes. The γ-ray production DDX for carbon and oxygen ion incidences on a carbon target was measured at the Heavy Ion Medical Accelerator in Chiba (HIMAC). Incident enegies for both of carbon and oxygen ion were 290 MeV/u. NE213 liquid organic scintillators were placed at 15°, 30° 45°, 60°, 75° and 90° in order to detect γ-rays and neutrons simultaneously. The γ-ray energies were determined by unfolding of light output spectra of the scintillators using the FORIST code. Detection efficiency for γ-ray was calculated by the EGS5 code. The experimental data were compared with one of radiation transport code, PHITS.
2011-10-29