Protecting astronauts from space radiation is one of the main critical issues in space exploration, especially in view of future missions, where an increase in mission duration will require an improvement in the protection strategies. While Galactic Cosmic Rays (GCRs) have a stochastic long-term health effects, exposure to strong Solar Particle Events (SPEs) can lead to deterministic ways to endanger an astronaut's life and cause mission failure. Currently, passive radiation shielding approaches represent the sole available technology to effectively protect humans from SPEs. In recent years several studies have been conducted based on the utilisation of resources already available on board, such as water, food and waste to be used as a protection. These studies propose different types of wearable, portable and personal multifunctional radiation shielding devices as promising solutions. This paper discusses the performance of each shielding method and provides comparative analysis on protection to the critical body parts during Intra-Vehicular Activities (IVA). The use and performance of different lightweight and low atomic mass (Z) materials is discussed, along with a proposal for a spacesuit concept for protection. Two different concepts for radiation protection so as to increase the number of 'safe days' in space are studied. The properties of a High-Density Polyethylene (HDPE) helmet to lower the effective dose equivalent absorbed by the brain is also investigated. The first solution presented is a 2 mm thick HDPE Suit. This concept provides radiation shielding in combination with wearable water bags with thicknesses in the range of 2 to 6 cm. The analysis shows a reduction of effective dose equivalent absorbed by the Blood Forming Organs (BFO) and other critical organs. An alternative concept of a suit with the insertion of low Z-high density boron nitride fillers (BN) in the HDPE of the suit, combined with boron doped HDPE jacket, is also discussed. This concep
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