Groundbased Research on Cross Sections of Radiation Shielding Material with High Energy Heavyion

Key words: 
• cosmic radiation /
• radiation shielding /
• total cross section /
• fragment production cross section

Abstract: Cosmic radiation， particularly the highenergy heavyion radiation， may cause serious injury on living organism. Therefore， it is one of critical restriction factor in Manned Spaceflight. Studies show that highenergy heavy ions interacting with the shielding materials can produce numerous kinds of fragments and secondaries. These particles have a direct impact on evaluation of shielding properties of different shielding materials， the optimal shielding structure design and lowdose evaluation after shielding materials. From perspectives of divisions of cosmic rays and passive shielding methods， this paper introduces the groundbased research of shielding materials. The passive shielding method was discussed, based on the experimental data of the total cross sections and fragment（production） cross sections of the aspects of different heavy ions with approximately same energy and 56Fe， 28Si heavy ions with different energies on H， C， CH2， Al and Cu radiation shielding materials. In addition， the fragment fluency distribution， the average LET distribution and the dose reduction per particle of 510 MeV/u 56Fe in different depth of CH2 material were also discussed.