There are different radiation protection/mitigation approaches including: physical, chemical, biological and physiological based methods. The physical approaches such as
shielding and technological enhanced radiation delivery is more prominent and new radiotherapy devices and techniques have been developed to have less normal tissue injuries, but those techniques are expensive and have their own problems. In space also, GCR and SPE can penetrate into the shielding material of planet and produce secondary radiation, including neutrons, gamma rays and other radiations. So, additional shielding is required.